TRT typically involves delivering exogenous testosterone to your system, either through injection or transdermal means like a patch or topical cream. They’re often a last resort for men who’ve been unsuccessful with other treatments or those whose T levels are low enough to warrant specialized treatment. At this time, the only reasons you might prefer Test Boost Max are that it includes Tribulus terrestris — which you'll rarely see in a Nugenix supplement — and that it costs a lot less. A firm believer in the connection between soil health and plant immunity, James advocates for building strong plant foundations through proper soil management.You'll soon start receiving the latest Mayo Clinic health information you requested in your inbox.Many men turn to testosterone boosters to combat side effects and support testosterone production.Drinking too much alcohol or smoking can interfere with the body’s natural testosterone production.Vitamin D. Your body naturally produces vitamin D when your skin is exposed to sunlight.According to market analysis, the global male enhancement supplement industry is expanding rapidly, driven largely by demand for safe, over-the-counter solutions 2. The 7 Best Testosterone Boosters of 2026: Tested and Reviewed Muscle loss, low energy, weight gain, lower sperm count, erectile dysfunction, and low sex drive.In addition to offering hormonal balance, these supplements double as beneficial agents promoting heart health and efficient metabolism because they pack bioavailable vitamins and minerals essential for diverse bodily functions.A study in the American Journal of Men’s Health found that Ashwagandha supplementation significantly increased testosterone levels in men.We'll also have a look at what happy (or unhappy) customers say about those products.Check for overlapping ingredients (like zinc or vitamin D) to prevent excessive intake.We earn a commission for products purchased through some links in this article. It can help in boosting your athletic functionality and can also be discovered to become lowering human body Body fat. It offers necessary nutrition to your body and perfects your muscle mass tone. It’s been established to generally be the most beneficial for decreasing human body Body fat and rising testosterone stages. Testosterone supplements rely on natural ingredients like Vitamin D3, nettle leaf extract, and Panax ginseng to boost testosterone levels. In order to identify the highest value testosterone boosters, we conducted thorough research and analysis on a variety of supplements. The great thing about testosterone boosters is that they're supplements that do not require prescriptions for purchase. Taking testosterone boosters without addressing these basics is likely going to have minimal effect even if testosterone levels are low.' Cranking up your T-levels with testosterone boosters without taking care of your basic health and well-being is running before you can walk. This section collects any data citations, data availability statements, or supplementary materials included in this article.Hunter Test Is one of the most potent testosterone boosters available.(35) However, some of the ingredients within this formulation lack solid scientific evidence.These supplements have helped improve my overall circulation, and I’ve noticed a significant boost in my energy levels and physical performance.(7)(19) Finally, the formula also includes 10mg of bioperine, which may enhance the absorption of nutrients in the supplement, however, more research is needed on this (1)Some brands may underdose key ingredients, making their products less effective.Throughout a man's life, testosterone plays a crucial role in muscular and skeletal strength as well as mood and personality.Our recommendations are based on products with solid scientific evidence for efficacy. Testosterone-boosting supplements can be quite expensive, but you will save money buying them in bulk. Each testosterone-boosting supplement is different in terms of formulation and time of consumption. Doctors have many ways of treating low testosterone and increasing free testosterone levels, from diet and exercise to testosterone replacement therapy. Test boosters can have instant effects for some people and little or no effect for others. Roman sometimes offers testosterone testing as part of its available services, making it a one-stop shop for men who want to get a diagnosis and treatment for their low testosterone. It has grown into a telehealth juggernaut over the years whose range of offerings includes hair loss treatments, erectile dysfunction (ED) treatments, and weight loss services. If a company doesn't use clinically relevant doses, it had better employ a combination of ingredients that can make up the difference. That’s why, as we consider safety and effectiveness to be such critical factors, we heavily scrutinize ingredients and doses. And like all health-related content on this website, this guide was thoroughly vetted by one or more members of our Medical Review Board for accuracy. Many of the key ingredients are clinically dosed in the proper amounts, earning a 4 out of 5 for formulation. (22)(26)(28)(36) We recommend discussing with your physician if you are considering taking a multi-ingredient supplement like this one to ensure it is safe and effective. (35) However, some of the ingredients within this formulation lack solid scientific evidence. All told, our team has read more than 185 research papers covering testosterone and the symptoms and treatment of testosterone deficiency. Several well-dosed ingredients, a proven track record, and a lifetime guarantee help to differentiate it. Dr. Urdaneta is a resident urologist and a member of the Innerbody Research Medical Review Board. After receiving his bachelor’s degree in writing, he attended post-graduate studies at George Mason University and pursued a career in nutritional science. In one study, men with impaired sperm production took D-Aspartic acid for 90 days. D-Aspartic acid is a natural amino acid involved in the synthesis and release of testosterone. When sexually sluggish male albino rats were given extracts of TT, their 'mount frequency, intromission frequency, and penile erection index' increased, researchers found. Could something other than low testosterone explain my symptoms? But Eisenberg stresses that men with very low testosterone have a higher chance of developing heart disease, osteoporosis, and other problems if they go untreated. Eisenberg says that studies of TRT’s benefits and risks have had mixed results and provide limited answers. Another concern is whether TRT actually improves symptoms linked to low testosterone. In 2014, the FDA ordered that a warning label must accompany TRT prescriptions, alerting men to the possibility that TRT increases the chances of heart attack and stroke. Strengths/Limitations: It allows you to be healthier by reducing the effects of age-related chronic conditions. Ashwagandha, also known as "winter cherry," is a well-known testosterone enhancer. These ingredients work together to deliver the most results without any harmful chemicals. They help men maintain better mental health and allow them to live life to their fullest potential. Mitch wanted to improve his energy levels to push harder in the gym.This, in turn, improves the condition of your skin, gives you stronger erections, and improves heart health.Meanwhile, Testogen's capsules offered a dose of D-aspartic acid at the upper end of what's been shown to be effective in studies.In the U.S., dietary supplements are regulated under DSHEA, meaning they don’t require pre-market FDA approval.This product’s design focuses on supporting growth hormones and testosterone levels simultaneously, making it ideal for those who want to stimulate muscle growth, enhance strength, and boost metabolism.In both men and women, this important hormone plays a vital role in fat loss and muscle growth as well as attaining and maintaining optimum health.Also known as longjack, tongkat ali has been shown to increase testosterone levels and decrease various markers of stress at doses ranging from 200mg to 400mg.37 38 It also appears to have a positive influence on erectile performance.39We chose TestoPrime as our pick for the best testosterone booster with zinc, which may help slow down the conversion of testosterone into estradiol (the predominant form of estrogen), according to the brand. It also regulates cortisol levels, reducing stress and improving mood and mental health. The Ultimate's first trick is raising energy levels within a few days or weeks of first taking it. It offers faster recovery, increased muscle strength, and muscle development. This supplement also improves sleep, elevates sex drive, and improves workout performance. Best Research-Backed Testosterone Supplement: Nutricost Testosterone Complex Many gym-goers and athletes explore testo boosters hoping to improve recovery time, lean muscle growth, and mental focus. They are not synthetic hormones but rather intended to optimize the body’s endogenous (natural) production pathways. These products typically combine vitamins, minerals, herbal extracts, and amino acids believed to influence hormone production, particularly free and total testosterone. Innerbody uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. If your testosterone levels are too low, it's possible that Viagra and similar prescription ED medications might not work. If your test results show testosterone levels below the normal range or your symptoms are significant, you should seek treatment beyond simple dietary adjustments. "When exogenous testosterone is injected, a blockage of the hypothalamus-pituitary-testis axis occurs, and sperm production stops." Best Testosterone Booster for Men Over 50: Legion Vitality Complex Testosterone booster supplements, often referred to as "testo boosters," are dietary formulas designed to naturally support healthy testosterone levels in men. It’s commonly used in natural testosterone boosters to support male reproductive health. Lower-priced testosterone boosters usually supplement testosterone production with one or two ingredients only and lack the broader range of nutritional support provided by more expensive testosterone boosters. They aren’t miracle cures and won't ward off Father Time forever, but they can help to keep your levels buoyant (and, hopefully, your penis standing to attention) for years to come. We’re unable to offer personal health advice, but we’ve partnered with JustAnswer who offers on-demand doctors to answer your medical questions 24/7. Our articles are resourced from reputable online pages, with research drawn from academic institutions and peer-reviewed studies. We have strict sourcing guidelines and rely on peer-reviewed studies, academic researches from medical associations and institutions. Choose carefully, and consult a healthcare professional if you take medication or have a medical condition. This product is perfect for someone looking to take their physical performance and results to the next level. This supplement has earned accolades as it combines potency with reliability, ideal traits for bodybuilders and fitness enthusiasts alike. In essence, Genius Test delivers more than just physical transformation; it reshapes your overall well-being with evident effects on energy, libido support, mental clarity, vigor, and wellness! Avoid products that hide amounts behind "proprietary blends," as this prevents proper assessment of efficacy and safety. According to market analysis, the global male enhancement supplement industry is expanding rapidly, driven largely by demand for safe, over-the-counter solutions 2. Marketing efforts by supplement brands have also highlighted real-world benefits, supported increasingly by clinical research on herbal and nutritional compounds. As a result, more individuals are turning to supplements as a non-invasive way to regain vigor and confidence. Lifestyle factors such as chronic stress, poor sleep, sedentary jobs, and suboptimal diets have contributed to declining energy levels among men globally. TestoPrime does include D-aspartic acid, which the supplement from Innerbody Labs lacks. You can see our favorite at-home testosterone tests in our comprehensive guide, many of which you can get with a discount as an Innerbody reader. But for those who aren’t sure whether their testosterone is low, at-home tests make it tremendously easy to measure their levels. Clinically low testosterone is also known as male hypogonadism, and it causes numerous symptoms. Roman's Testosterone Support supplement also does an excellent job of balancing safety and efficacy in a very affordable product. Even the most researched ingredients may not be effective for boosting testosterone if the dosages are too low. It’s important to choose a testosterone supplement that not only contains quality ingredients but also includes them at clinically effective dosages. (12)(14)(20)(24)(36) Be cautious of products that include unnecessary additives or filler ingredients that aren’t well studied. Check the ingredients list to ensure the product you choose contains ingredients backed by clinical support. We focused on quality ingredients, clear labels, proper dosages, and third-party testing to ensure the products on this list are top-notch. Who Else May Need Natural Testosterone Boosters? Designed as a natural alternative to pharmaceuticals, it is less likely to cause side effects. The product is only available on the official website, ensuring authenticity but making it inconvenient for those unable to purchase in person. The formula focuses on increasing nitric oxide levels to improve circulation, sexual function, and the ability to achieve erections. Its nitric oxide-enhancing formula and money-back guarantee make it a good option for those seeking a natural solution. Of the ingredients listed, only Tribulus terrestris and longjack appear in doses we would consider likely to be effective. To make up for this, the company boosted its longjack dose from 20mg to 200mg, but that’s not quite enough to make up for the loss of a high-quality, clinically dosed ashwagandha. That’s a significant blow to the product's potential efficacy. Some studies have suggested that masturbation can have a short-term effect of lowering testosterone levels, but some have also suggested the exact opposite.' Studies suggest that DHEA is an effective testosterone booster. The increases were higher in the athletes, which suggests that magnesium boost testosterone in men with normal levels. And even then, everyone is different, so it’s best to consult your doctor before trying a testosterone booster. Testosterone boosters vary in price based on several factors, including the number of ingredients, dosages, and certifications. (23) Zinc aids testosterone production and enhances recovery after workouts, helping to maximize muscle gains. I would definitely recommend these supplements to anyone looking to boost circulation, improve energy, or enhance performance. It targets male sexual health by improving blood flow, testosterone levels, and endurance. Made with natural ingredients, PeakErect® supports male vitality, performance, and confidence. In fact, when it comes to fitness, muscle growth and body composition, normal testosterone levels are essential for you to succeed at your fitness goals. Vitamin D3 supports numerous body functions, including testosterone production.(8) This vitamin helps strengthen your bones and joints by regulating metabolism of calcium and phosphorus. D-aspartic acid is the major ingredient in nearly every natural testosterone booster. Hone Health pricing TestoGen easily clears any doubts as it is an all-natural testosterone booster. It's a premium product with a careful selection of ingredients that support optimal levels of testosterone. These 10 boosters are strong competitors for the strongest testosterone supplement on the market. We'll examine how these pills increase testosterone production, their health benefits, and everything else you need to know. In a study of taekwondo athletes and sedentary men, supplementing with magnesium increased testosterone levels in both groups. Testosterone boosters can be found in safe, legal places, like your local chemist or hormone therapy clinics. Building good sleep habits and a bedtime routine can naturally boost testosterone over time. Resistance training, compound movements, and exercises targeting testosterone production can be very effective. Go for formulas that provide steady energy without crashes, ideally with no stimulants or overly aggressive ingredients that can harm your body. Some brands may underdose key ingredients, making their products less effective. “I took Swolverine’s ZMT supplement about 30 minutes before bed,” he said. This product involves 6 vegetarian capsules per serving, though, on the bright side, you only need to take the serving once before bed. Our tester Pete loved Swolverine’s clean, light blue label, giving this product a 5 out of 5 for first impression. However, he did note its higher-than-average dosage of clinically backed ingredients, which likely explains the higher price. Pete gave the supplement its lowest score of a 1 in the price category, which stands to reason because each serving is more than $2. We focused on products with positive reviews and high satisfaction rates among users. Our recommendations are based on products with solid scientific evidence for efficacy. Too little testosterone results in muscle weakness, low mood, anxiety, and weight gain. Testosterone replacement treatment (TRT) aims to boost those low levels back up. Testosterone, a hormone, helps men maintain muscle, bone health, libido, and the ability to perform in the bedroom. Use only if lifestyle assessments suggest deficiency or performance goals warrant support. Most users need 6–12 weeks of consistent use to notice changes in energy, mood, or physical performance. Testosterone boosters is a catch-all term given to a range of supplements that increase levels of testosterone. Along with testosterone boosters, there are plenty of natural ways to pep up your T-levels with diet, exercise and other lifestyle changes. Compare the supplement’s dosage to the clinically proven levels in top testosterone boosters to find the best option. The best testosterone boosters for fat loss can support metabolism, helping you shed excess fat and build lean muscle. Many top testosterone booster pills include fenugreek for its potential to support libido, energy, and overall male health. Each product may have different dosing guidelines, so it’s crucial to read and understand the label before starting any supplementation. Moreover, this total package comes with 90 counts per pack — a generous amount that lasts longer than most competing supplements on the market. This particular formula outperforms competitors by offering robust testosterone support while eliminating stimulants and unnecessary fillers. Physique athletes who constantly work out or are under grueling training conditions will find T-Bomb’s feature of supporting an increase in strength particularly beneficial. These elements work together to support protein synthesis — a key factor for muscle growth — while also reducing protein breakdown. Roman return policy While most supplements designed for boosting your testosterone should generally be safe for adult use, it’s crucial to understand the potential side effects individual products may have. Another popular option, Nugenix Total-T, is known for its effectiveness in supporting healthy testosterone levels and muscle building. To ensure the safe and effective use of testosterone boosters, it is important to follow the recommended dosage instructions provided by the manufacturer. The ideal customer for MHP T-Bomb is a performance-driven individual looking to increase their testosterone levels and improve their overall physical and sexual health. Designed to augment healthy testosterone levels, this product has, over the years, gained a loyal following of fitness enthusiasts and bodybuilders. As you can see, the only product that comes close to matching Innerbody Labs' combination of ingredients and clinically relevant doses is Nugenix, but its Total-T MAXX costs nearly $100 more per bottle. TestoPrime presents a reasonably sized combination of ingredients that may boost total or free testosterone, and its doses consistently beat out much of the competition. A supplement with nothing but the former might increase total testosterone but not in a way that would improve the symptoms of low T. If a vitamin D deficiency is suppressing your testosterone, a supplement with 100 ingredients but no vitamin D would likely prove ineffective (not to mention costly). If you have normal testosterone levels and are looking for strength-gaining boost, D-Aspartic acid use may be less fruitful. Although testosterone is vital, falling testosterone levels aren't necessarily something to worry about – they're as natural as finding a grey hair or two. L-arginine supplements are great for energy and stamina, while Ashwagandha and Longjack support stress and hormone balance. Many users (including legendary bodybuilder Robby Robinson – who takes TestoFuel every day in his 70’s) have found that TestoFuel is able to raise their strength, libido, testosterone levels, as well as being able to lose more belly fat. The purest, most effective testosterone booster. Testosterone levels naturally decline as men get older, and low testosterone can contribute to health problems ranging from obesity to erectile dysfunction or depression. It helps in boosting your athletic functionality and is likewise found to become lowering entire body Extra fat. Unlike risky steroids or Viagra sex pills, TestoTitan offers a safe and effective solution to enhance male vitality and performance without the side effects. Avoid taking alcohol or products that cause drowsiness. What Is the Correct Dosage of a Testosterone Booster Supplement? Low testosterone levels can cause you to feel tired, lethargic, eliminate sex drive and libido, increase body fat storage, and waste away lean muscle mass. A natural testosterone booster is one comprised of natural ingredients, rather than artificial fillers or synthetic compositions. Testofuel is formulated with multiple ingredients that may help support your body’s production of testosterone and other hormones. (9) Another 2014 study on tongkat ali indicated it may increase testosterone levels, support sexual health, promote bone strength, and lower cortisol levels. Value is maximized when transparency, proven ingredients, and independent verification align within a reasonable price point. Premium ($45+) brands usually invest in patented ingredients, advanced delivery systems, and comprehensive third-party testing. Some niche variants include transdermal patches or sprays, though evidence supporting their efficacy is limited compared to oral ingestion. Additionally, fitness culture and social media have amplified demand for performance-enhancing yet legal substances. The best choice depends on your health goals, age, and sensitivity to stimulants—always consult a healthcare provider before starting any regimen 1. In some cases, we also included ingredients designed to maximize the potential of our testosterone-boosting ingredients (like black pepper extract, which doesn’t boost testosterone but does improve the absorption of other ingredients).40 So we decided to create a testosterone support supplement that could fill the gaps and offer more men the highest likelihood of success. By comparison, testosterone-replacement therapies (TRTs) introduce significantly more risk than supplements, especially gels and creams that can leave a residue and transfer to women and children. However, because some ingredients can affect blood flow and influence the activity of the testes and other parts of the endocrine system, we highly recommend speaking to your doctor before starting any new regimen to increase testosterone. Taking magnesium as a supplement has been shown to increase free and total testosterone values. Zinc may promote testosterone production in the testes. Zinc deficiency has been linked to low testosterone levels. Consult a health care practitioner if symptoms persist or worsen.The product is available as a single purchase or via subscription with a 15% discount.We'll continue to monitor the situation and update this page as Roman brings its testing and prescription support back online.Even though testosterone boosters are available over the counter, it’s important to talk with your doctor before starting to take a testosterone boosting supplement.Giving you everything you need to pack on lean muscle, get stronger, and feel focused and motivated.They also delivered 50mcg of vitamin D, which is pretty close to what studies often use to increase testosterone.22Many users (including legendary bodybuilder Robby Robinson – who takes TestoFuel every day in his 70’s) have found that TestoFuel is able to raise their strength, libido, testosterone levels, as well as being able to lose more belly fat. As you age, your testosterone level gradually declines — typically about 1% a year after age 30 or 40. Testosterone levels generally peak during adolescence and early adulthood. The influence of testosterone in men Zinc offers many benefits to your health, and studies support the notion that it suppresses SHBG.8 That allows more of the testosterone you produce to be free, which can help with reducing fatigue and gaining lean muscle mass. Understanding how a given product can help raise your testosterone levels starts with understanding its ingredients. It offers some of the best-researched ingredients for addressing low testosterone levels, and it provides those ingredients in quantities that studies have shown to be effective and safe. In our opinion, the best testosterone booster currently on the market is Testosterone Support by Innerbody Labs. The top supplements in this guide may have certain ingredients that pose some risks, such as ashwagandha’s potential influence over thyroid hormone levels.16 But those risks are either extrapolated from related data or currently only exist as case studies. These natural supplements help maintain testosterone levels, improve strength, boost energy, and support sexual health.If you have any pre-existing conditions or are prone to negative reactions with supplements, we recommend consulting a doctor before trying Testosil.Information and statements about products are not intended to be used to diagnose, treat, cure, or prevent any disease or health condition.If you are overweight or obese, weight loss and, perhaps especially, exercise may help boost your levels without medication.Are you a health-conscious, active man looking for a powerful and effective testosterone supplement without any hidden ingredients?While the highest quality testosterone boosters often require a visit to the doctor or a hormone specialist, there are still excellent over-the-counter options available.Pete gave the supplement its lowest score of a 1 in the price category, which stands to reason because each serving is more than $2.Is definitely the nutritional supplement which increases your testosterone and brings again your dropped manhood and stamina. This product contains Epimedium, Saw Palmetto, and Longjack, with a daily dose of two capsules. The product is available in various forms to suit different needs and preferences. The product is available as a single purchase or via subscription with a 15% discount. DMoose Testosterone Booster is designed for men experiencing age-related testosterone loss. It’s great to find a product that does what it promises without any side effects. By optimizing hormone production, they not only are a booster for muscle growth but also influence other aspects like libido, mood stability, and overall energy levels.Remembering that exposure to heat or sunlight may result in damage or melting of this coveted product underlines how each capsule has been meticulously crafted.Stamina boosters range from $20 to $80+ per bottle, typically lasting 30–60 days.Women’s ovaries produce testosterone in lesser amounts.However, these are usually temporary and should disappear once your body adjusts.Consult a healthcare practicioner prior to use if you have diabetes, or if symptoms persist or worsen during use, at which point discontinue use.Due to this, it allows men to reach their "peak" levels even after their "peak" age.Many natural boosters contain nutritional ingredients that positively interact with your body’s hormone production, potentially enhancing your total testosterone levels. Combine quality sleep with supplements to see the best results. Testosterone levels increase during deep sleep, so aim for 7-8 hours of uninterrupted rest each night. Chronic stress raises cortisol levels over time, which can lower testosterone. A well-rounded diet is essential for maintaining long-term testosterone health. Protein aids muscle growth, while healthy fats from nuts and fish help balance hormones. A PubMed analysis as detailed in the methods was undertaken for the 10 most common ingredients used across all supplementsand is presented in Table 2. A total of 19 unique ingredients were identified across the group of supplements; eachsupplement consisted of an average of 9.8 ± 2.2 ingredients (Range 7-12). Supplement ingredients were aggregated and catalogued for each supplement, and the 10 most frequently utilized ingredientsacross the set of supplements were identified. Thesignificance of these fake product reviews is heightened by the fact that patients place high levels of trust in health-relatedinformation displayed online. Positive feedback often highlights improved morning energy, better gym performance, and enhanced mood after 6–8 weeks of consistent use. Conversely, ultra-expensive supplements don’t always deliver superior results. Be cautious of extremely cheap products—these may cut corners on ingredient quality or use ineffective forms (e.g., non-standardized fenugreek). We recommend that you prioritize a testosterone booster with well-researched ingredients, rather than selecting based on what an influencer may be promoting. For those who still wish to explore these options, it’s best to look for products with well-known ingredients and to prioritize safety by talking with your doctor or other healthcare professional before starting any supplement regimen. We recommend browsing the best creatine supplements, as these are among the most-researched products for muscle growth and strength gain. This product may not be right for you.This natural plant has been used for centuries in China to help with various health issues.A 2009 study has shown that D-aspartic acid can increase LH levels in men and women.4 In men, it signals the testes to produce testosterone.In men with low T, hCG performs like LH, providing additional signals to the testes that it's time to make more testosterone.28Most of the research into ginseng's potential as a testosterone booster has taken place in rats and mice.13 The results are compelling, but more human trials are needed.Our supplement provides relevant doses of every key ingredient.That, in turn, could result in increased energy levels and enhanced libido. A unique aspect of the MHP T-Bomb is that it effectively reduces conversion to DHT (Dihydrotestosterone), contributing significantly towards improving your overall hormonal balance. The fact that it also promotes lean muscle mass accretion makes it even more invaluable. If you want the most advanced GH support formula on the market, try Cellucor P6 Ultimate GH today! Yet one should remember there can be downsides with any supplement — some users have reported minor side effects such as stomach discomfort after use. Remembering that exposure to heat or sunlight may result in damage or melting of this coveted product underlines how each capsule has been meticulously crafted. So, some people may react differently to testosterone boosters than others, especially considering there are so many additional lifestyle factors that can affect your hormonal health. (33) On the other hand, testosterone supplements are intended to work with your body to naturally help improve and maintain healthy hormone levels. Unfortunately, aging, stress, poor sleep, health conditions, and certain medications can chip away at testosterone levels, leaving many athletes looking for testosterone-boosting supplements. Long-term safety data is limited, so periodic breaks or re-evaluation with a healthcare provider is advisable.Do sperm count boosters increase testosterone?