Max Performer Reviews: Can it improve libido and strengthen erections?

As men age, we experience more and more issues surrounding sexual performance, stamina, and libido. But these issues are not at all exclusive to older men. ED affects adult men of all ages, as do issues with sperm count and motility.¹ So, naturally, there are numerous companies like Max Performer offering solutions. We’ll dive into the available research regarding Max Performer’s ingredients so you can decide whether it can help you safely address your concerns in the bedroom.

Max Performer is generally safe to use, and most of its ingredients produce positive results in studies that use similar doses. But some other ingredients appear in lower doses, calling their efficacy into question. In the end, Max Performer has the potential to be effective for some men, particularly those with specific vitamin or mineral deficiencies.

In reviewing Max Performer, we leveraged thousands of hours of research in the men’s sexual health landscape to evaluate the product and its specific ingredients against its closest competition. All told, we reviewed more than 200 scholarly articles on the ingredients in question and on men’s sexual function in general. We’ve explored efficacy by comparing the parameters and doses of those studies with the ingredients, quantities, and dosing schedule for Max Performer and its competitors. And we’ve gotten our hands on the products to compare customer experience, delivery and return logistics, and privacy considerations. We’ve consulted with experts in esoteric fields and talked to customers who are willing to share their experiences.

Like all health-related content on this website, this review of Max Performer was thoroughly vetted by one or more members of our Medical Review Board for accuracy. We’ll continue monitoring Max Performer and the broader men’s health supplement market to keep this review up-to-date.

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions to improve their health.

Whenever we evaluate a product, we try to put ourselves firmly in the position of a potential customer and consider their needs above all else. As a male enhancement pill, Max Performer’s potential effectiveness is paramount. Few men would choose an obviously inferior product to save a few dollars, especially when the treatment at hand is designed to affect them sexually. And nobody would knowingly pay for a supplement that does nothing simply because it’s safe.

So, effectiveness is weighted slightly more heavily in our rankings, but safety isn’t far behind. Just as many men would prefer to pay a little more for something they know would work, they would also pay more to ensure the product affecting their sexual performance is safe. After these two critical criteria, we consider cost and convenience parameters that vary only a little bit from one male enhancement product to the next.

Ultimately, we see Max Performer as a good fit for men who suspect that nutritional deficits may be at least partly to blame for their sexual dysfunction. The product’s multivitamin complex and a few key botanicals can help counteract certain deficiencies or underlying issues related to diet. And with many ingredients appearing in doses lower than those used in relevant clinical research, there’s a smaller risk of side effects.

Let’s take a closer look at each criterion to see how Max Performer stacks up.

Effectiveness

Rating: 6.75/10

Max Performer has just enough ingredients with some clinical evidence at just high enough doses that it can make a positive difference after several weeks of consistent daily use. An ingredient like maca, which appears in successful studies in a range of 1,200-3,500mg, is present in Max Performer at 1,000mg.² That may be slightly less than typical clinical use, but it’s so close that potential customers can reasonably expect it to make a difference in combination with other ingredients.

(Remember, most studies look into these ingredients in isolation, not in combination. That’s not to say that a supplement with ingredients that appear at a fraction of the clinical doses will mysteriously perform greater than the sum of its parts. But when doses are as close as they are in the case of maca in Max Performer, it’s easier to expect some degree of efficacy.)

You can’t always take these labels at face value, however, and the horny goat weed dose is a great example. Max Performer lists 1,000mg of epimedium in its supplement, but we had to reach out to the company to find out that the icariin concentration in its formula was only 10%. Icariin is the main beneficial compound in horny goat weed, and a 100mg dose of icariin is significantly smaller than what seems like a 1,000mg dose to the untrained eye.

That said, Max Performer’s 100mg of icariin may still prove pretty effective. One prominent study in rats used concentrated icariin doses of 1mg/kg, 5mg/kg, and 10mg/kg of body weight.³ Translated to humans, that’s roughly 900mg for a 200lb man at the high end and 90mg at the low end. All three dose levels showed erectogenic effects, and — somewhat surprisingly — the low-end 1mg/kg dose was the only one of the three to provide an increase in serum testosterone, whereas the higher doses saw testosterone levels drop.

Many of the studies looking at botanical ingredients in Max Performer were performed in animals, and more human studies are needed. Even among human studies, study populations have been low, necessitating larger studies into specific doses before we can definitively say these ingredients work. Current research is promising, but it’s not there yet.

Safety

Rating: 8/10

When we consider the safety of a given supplement, we scour available research on its ingredients for any and all mentions of adverse effects. Patterns often emerge across multiple studies or in meta-analyses that tell us what kinds of side effects the average person can expect and which side effects might impact specific groups of people.

In Max Performer’s case, there’s enough data on the majority of its ingredients that we could consider it generally safe for most men. Still, there are a number of potential side effects that are common across several of its ingredients, including:

• Nausea
• Headache
• Vomiting
• Insomnia
• Increased heart rate
• Abdominal pain
• Gout
• Itching
• Flushing

Most minor gastrointestinal side effects will often subside after a few days of treatment, but lingering side effects or any other type of side effect beyond a mild headache should be taken seriously.

Despite its prevalence in herbal medicine, there is some negative correlation between ginseng and certain prescription drugs like warfarin and phenelzine.⁴ And because many male enhancement products include ingredients intended to increase blood flow — and, incidentally, lower blood pressure — they may be dangerous for men with low blood pressure or those on medication to maintain it.

Compared to other supplements in its class, this is a favorable side effect profile. That’s largely due to Max Performer’s tendency to dose its ingredients toward the low end of ranges used in studies. There may be a minor sacrifice in efficacy as a result, but if there is still efficacy and the product is safer, it’s a better choice.

Always consult a physician before adding Max Performer or any new supplement to your regimen. Supplements aren’t meant to treat or cure (nor are they intended to prevent or diagnose) any medical problems, including ED.

Cost

Rating: 6/10

Our cost consideration goes beyond just the price tag on a product. We look at things like bulk or subscription savings opportunities, return policies, money-back guarantees, and shipping costs. Among supplements in its class, Max Performer is one of the most expensive for a one-month supply. That said, its savings at the highest bulk level are some of the steepest compared to the price of that one-month supply.

But most people don’t want to invest in an entire year’s worth of male enhancement products. And many who would want to can’t afford the large lump sum investment. So, while we appreciate the opportunity for savings at those bulk levels, it doesn’t do much to lower the cost for the average person.

Here’s a quick look at how Max Performer’s costs compare to others in its class:

As you can see, Max Performer has one of the lowest monthly prices when you purchase an entire year’s supply, but not everybody has $360 to spend out of the gate. You may be tempted to try just one month’s worth, but it’s crucial to remember that the ingredients in these supplements can take up to three months to start taking effect. At that three-month level, Max Performer lands somewhere in the middle of the pack.

Fortunately, it’s one of just three supplements in our chart that provides a long enough money-back guarantee for men to actually see if it works at 100 days. Most other companies offer 67 days or less. However, single-box orders aren’t eligible for this guarantee, so we recommend starting with that three-month supply if you’re interested.

Convenience

Rating: 6/10

There are certain things we prefer to see for customer convenience, including the ability to set up a subscription and not have to worry about reordering. Max Performer doesn’t provide a subscription program, which is frustrating but not atypical among male enhancement supplements.

Maybe the biggest knock on Max Performer's convenience is its customer service infrastructure — or lack thereof. A generic email address is the only way to contact the company, with no telephone or live chat support available. In our experience, the company responds to emails relatively quickly, often in less than 24 hours. Still, other companies have both chat and phone support, and we see no good reason why Max Performer can't have the same.

In the grand scheme of things, with a supplement that can take up to three months to start working, having to wait up to a few days before getting a question answered won’t set you back too much. But if any problems arise — including the need to cash in on that 100-day money-back guarantee — we’d be more comfortable if they were more responsive.

Max Performer is a non-prescription nutritional supplement made by the U.K. company Silver Blade Nutrition. Designed to help men suffering from mild forms of sexual dysfunction, it provides a set of botanical ingredients with a complex of vitamins and minerals. Several of its ingredients have performed well in studies looking at erectile performance and testosterone levels, but no studies have examined how Max Performer’s specific ingredient combination works in men (a common issue consumers have to grapple with).

Here’s a quick look at Max Performer’s ingredients. We dive deeper in the next section:

• Horny goat weed: 1,000mg (standardized to 10% icariin)
• Maca: 1,000mg
• Cordyceps: 1,000mg
• Korean red ginseng: 1,000mg
• Bioperine: 15mg
• Selenium: 120mcg
• Zinc citrate: 24mg
• Iron: 14mg
• Riboflavin (vitamin B2): 10mg
• Niacin (vitamin B3): 32mg
• Pantothenic acid (vitamin B5): 40mg
• Pyridoxine hydrochloride (vitamin B6): 10mg
• Cyanocobalamin (vitamin B12): 10mcg

Max Performer relies on ingredients with at least some clinical research behind them in the sexual health field. Some boast studies that show increases in blood flow to the penis, sperm motility, energy, and stamina. Others need further scrutiny, either because the current collection of studies is too small or because that collection focuses on animals’ reactions. It’s nonetheless well worth looking into Max Performer’s main ingredients for indicators of its potential efficacy and safety.

Max Performer is a legitimate product. The particular men’s health niche to which it belongs isn’t known for particularly modern website design or customer service, but the ingredients and compounding of the product itself are fine. We’d certainly like to see companies in this space perform some third-party testing for purity and safety so we can guarantee that you’re taking what they claim to include.

There is some scientific evidence that some of its ingredients can help men achieve erections, especially if the reasons for their sexual dysfunction are nutritional in nature. More clinical research is needed.

For most users, Max Performer should be relatively safe. Most people who experience side effects will encounter mild reactions connected to certain ingredients, but these rarely rise above a slightly elevated heart rate or an upset stomach.

There are some cardiovascular risks associated with ginseng and any ingredient that can improve blood flow by relaxing blood vessels.²⁰ That should give pause to men with any history of heart problems. This is also true of prescription-strength PDE-5 inhibitors, but it’s worth noting that those drugs have a lot more research into their potential effects on heart health, and doctors are better-equipped to recognize and interpret those effects than they’d likely be if ginseng were the culprit. A few other ingredients, including generally safe vitamins and minerals, have the potential to cause everything from stomach discomfort to gout if taken in extreme doses.

For those reasons, we suggest that you talk to your doctor before taking Max Performer. It’s also not a good idea to mix Max Performer with a daily multivitamin before talking first with your doctor or dietitian, as you may run the risk of over-supplementation and toxicity in some cases. Those currently taking blood thinners and other medications associated with the cardiovascular system should take extra precautions and talk with their doctor.

Max Performer offers four pricing tiers for its product; your best option will depend on how much you can spend up-front, whether you know the product works for you, and how much pantry space you have. You can purchase a supply for one, three, six, or 12 months. Here’s a quick breakdown of the costs:

The 12-month supply offers the best value, but if you don’t have the capital to invest that much or you want to wait to see how it works, we suggest starting with the three-month supply. That way, you get the company’s 100-day money-back guarantee. And since it can take up to 90 days to see any results, this order gives you the best chance to see if the product works for you.

Other companies — like Semenax or VigRx Plus, both under the Leading Edge Health banner — offer 67-day guarantees, which isn’t always long enough for their ingredients to start working fully. Max Performer’s money-back guarantee is much stronger in this way.

Max Performer accepts major credit cards and PayPal, and it provides free first-class shipping via USPS on all orders.

Max Performer is one of many products designed to improve a man’s sexual performance. This particular area of the men’s health market can be a little dangerous to navigate, with counterfeit supplement producers who sometimes slip prescription drugs into their products and even supplement manufacturers that recklessly use untested ingredients and make outrageous promises about penis size.

In our guides and reviews, we’ve done the lion’s share of this navigating for you and separated the wheat from the chaff. Knowing what safe alternatives are available is critical, whether you end up trying Max Performer and deciding to move on after a few months or you want to evaluate it against its closest competition before placing any orders.

Since Max Performer is considered a male enhancement pill, we’ll look at some of the other male enhancement pills on the market, our favorite of which is Performer 8. We’ll also compare it to testosterone boosters, as the two categories share a lot of ingredients; treating low testosterone levels can have a profound effect on male sexual health. We believe Max Performer is a viable choice among its peers, but there are other options that may be superior for you, some of which cost less.

And we’d be remiss if we didn’t also talk about prescription alternatives, especially for men who hope that a male enhancement product will address erectile dysfunction.

Other male enhancement pills

Not all male enhancement pills are created equal. They each use various ingredients customized to a specific formula, with doses ranging from pathetically small to dangerously abundant. When we put together our guide to the best male enhancement pills, we included only those offerings that we thought had the best chance of efficacy with the greatest degree of safety.

That scrutiny doesn’t mean that everything in our guide is perfectly safe for you, but it does mean that most men will be able to have a relatively short conversation with their doctor to find out if it’s right for them. And while we aimed to find products with the highest chances of success, that ceiling is a bit low; men aren’t likely to feel a night-and-day difference from taking a male enhancement pill, and many won’t feel much at all.

To briefly summarize the findings in our guide, we found Performer 8 to be the best overall pick, thanks largely to its high dose of ginseng and clinically relevant dose of a high-quality ashwagandha extract. Ashwagandha is strangely a somewhat rare ingredient among male enhancement pills, though you might see it more among testosterone boosters. It has the ability to boost testosterone²³ while also providing anti-anxiety effects — perfect for men who get caught in a negative feedback loop of self-doubt if they have trouble performing.²⁴ The only downside is that ashwagandha may be unsuitable for men with thyroid issues, making something like Max Performer a more attractive option.²⁵

If price is your greatest concern, Extenze seems to have the lowest costs among acceptable products, with a one-month supply costing $49 and the price per month dropping as you make larger bulk orders. You can certainly find cheaper male enhancement pills, but their safety is going to be questionable.

Testosterone boosters

Testosterone boosters are a subcategory of male enhancement pills, and they share a handful of ingredients in common with typical male enhancement pills, including,

• L-Arginine
• Maca
• Zinc
• Ginseng
• B vitamins

Testosterone boosters also include several ingredients you’ll only see in male enhancement products from time to time, like ashwagandha, fenugreek, and D-aspartic acid. Vitamin D is also central to many testosterone boosters, as low T and D3 deficiency are closely linked in clinical research.²⁶

For most men, testosterone levels start to fall off around age 40 at a rate of 1% each year. Some men see sharper declines earlier in life. Clinically low testosterone is defined by the American Urological Association as two consecutive tests with results of less than 300 nanograms per deciliter (ng/dL).²⁷ Men with levels lower than this are more likely to see benefits from supplementation than those with normal testosterone. To check your levels, you can go to your doctor, but at-home testosterone testing is just as reliable and a lot easier.

If you find you have low testosterone, you can consult our guide to the best testosterone boosters, which identifies TestoPrime as the overall best option for most men (though your circumstances might make a different option in our guide more suitable). Like Performer 8 in the male enhancement space, TestoPrime contains ashwagandha and ginseng, but it also offers fenugreek, D-aspartic acid, zinc, and vitamin D. And our top budget pick comes from one of our favorite at-home testosterone testing companies: Roman. One month of Roman’s Testosterone Support costs just $35 and is automatically part of a convenient subscription. If you bill quarterly, you can take that price down to $29/month compared to the monthly $69 cost for a single month of Max Performer or the $46 monthly cost you incur if you purchase three-month supplies.

Of course, if you find that your testosterone levels are normal or you have good reason to believe you have healthy testosterone levels, you might want to start on the male enhancement side with products like Max Performer.

Prescription medication

Whether for lack of trust in the pharmaceutical industry or lack of insurance, many men look to supplements before considering prescription medication to address sexual performance issues. But there’s a very good argument to be made that prescription medicines are safer than their supplemental alternatives, not least of all because they’re more stringently regulated by the FDA. Prescription drugs also undergo a massive amount of top-quality clinical research before hitting the market, something that can’t be said about any men’s health supplement. Even some of the supplements from Leading Edge Health that have had their specific formulas studied did so in small populations with financial sponsorship from the parent company (creating a conflict of interest). There is no comparison between this type of study and the rigorous clinical studies that prescription ED medications undergo.

For men struggling with even moderate, occasional ED, prescription PDE-5 inhibitors will almost always work better than supplements like Max Performer.²⁸ They also happen to be a lot more convenient because you don’t have to take them daily (unless you choose to with Cialis and generic tadalafil). There are even non-hormonal prescriptions for low testosterone that men would be smart to consider should their tests come back confirming low T.

Here’s a look at the prescriptions you can expect to find online:

Access to prescription ED medication and testosterone treatment has become decidedly simple in the telehealth era, with the following companies offering doctor consultation, prescription, and delivery all on a single platform:

• BlueChew: offering chewable forms of sildenafil, tadalafil, and vardenafil
• Hims: offering Viagra, sildenafil, Cialis, generic Cialis, tadalafil, and Stendra
• Roman: offering sildenafil, tadalafil, and clomiphene
• Rugiet: offering a lozenge containing a combination of sildenafil, tadalafil, and apomorphine

Generally, we encourage men to start with BlueChew for ED and Roman for testosterone prescriptions. BlueChew’s chewable tablets provide unbeatable convenience, the company offers a free trial, and its ongoing pricing is favorable to most. Roman is currently the only online provider we recommend that stocks clomiphene. And since they also provide testosterone testing, you can do everything in one place.

1. Mulhall, J. P., Luo, X., Zou, K. H., Stecher, V., & Galaznik, A. (2016). Relationship between age and erectile dysfunction diagnosis or treatment using real-world observational data in the United States. International Journal of Clinical Practice, 70(12), 1012. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5540144/
2. Shin, C., Lee, M. S., Yang, E. J., Lim, S., & Ernst, E. (2009). Maca (L. meyenii) for improving sexual function: A systematic review. BMC Complementary and Alternative Medicine, 10, 44. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2928177/
3. Shindel, A. W., Xin, C., Lin, G., Fandel, T. M., Huang, C., Banie, L., Breyer, B. N., Garcia, M. M., Lin, S., & Lue, T. F. (2010). Erectogenic and neurotrophic effects of icariin, a purified extract of horny goat weed (Epimedium spp.) in vitro and in vivo. The Journal of Sexual Medicine, 7(4 Pt 1), 1518. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3551978/
4. Coon, J. T., & Ernst, E. (2002). Panax ginseng: a systematic review of adverse effects and drug interactions. Drug Safety, 25(5), 323–344. https://pubmed.ncbi.nlm.nih.gov/12020172/
5. Fang, J., & Zhang, Y. (2016). Icariin, an anti-atherosclerotic drug from Chinese medicinal herb horny goat weed. Frontiers in Pharmacology, 8. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5644024/
6. Tan, X., & Weng, W. (1998). Efficacy of epimedium compound pills in the treatment of the aged patients with kidney deficiency syndrome of ischemic cardio-cerebral vascular diseases. Bulletin of Hunan Medical University, 23(5), 450–452. https://pubmed.ncbi.nlm.nih.gov/10682558/
7. Hatzimouratidis, K. (2006). Sildenafil in the treatment of erectile dysfunction: An overview of the clinical evidence. Clinical Interventions in Aging, 1(4), 403-414. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2699643/
8. Shin, C., Lee, M. S., Yang, E. J., Lim, S., & Ernst, E. (2009). Maca (L. meyenii) for improving sexual function: A systematic review. BMC Complementary and Alternative Medicine, 10, 44. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2928177/
9. Gonzales, G. F., Córdova, A., Vega, K., Chung, A., Villena, A., Góñez, C., & Castillo, S. (2002). Effect of Lepidium meyenii (MACA) on sexual desire and its absent relationship with serum testosterone levels in adult healthy men. Andrologia, 34(6), 367–372. https://pubmed.ncbi.nlm.nih.gov/12472620/
10. de Andrade, E., de Mesquita, A. A., Claro, J.deA., de Andrade, P. M., Ortiz, V., Paranhos, M., & Srougi, M. (2007). Study of the efficacy of Korean Red Ginseng in the treatment of erectile dysfunction. Asian Journal of Andrology, 9(2), 241–244. https://pubmed.ncbi.nlm.nih.gov/16855773/
11. Hong, B., Ji, Y. H., Hong, J. H., Nam, K. Y., & Ahn, T. Y. (2002). A double-blind crossover study evaluating the efficacy of korean red ginseng in patients with erectile dysfunction: a preliminary report. The Journal of Urology, 168(5), 2070–2073. https://pubmed.ncbi.nlm.nih.gov/12394711/
12. Buettner, C., Yeh, G. Y., Phillips, R. S., Mittleman, M. A., & Kaptchuk, T. J. (2006). Systematic review of the effects of ginseng on cardiovascular risk factors. The Annals of Pharmacotherapy, 40(1), 83–95. https://pubmed.ncbi.nlm.nih.gov/16332943/
13. Jiraungkoorskul, K., & Jiraungkoorskul, W. (2016). Review of Naturopathy of Medical Mushroom, Ophiocordyceps Sinensis, in Sexual Dysfunction. Pharmacognosy Reviews, 10(19), 1-5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4791983/
14. Pohsa, S., Hanchang, W., Singpoonga, N., Chaiprasart, P., & Taepavarapruk, P. (2019). Effects of Cultured Cordycep militaris on Sexual Performance and Erectile Function in Streptozotocin-Induced Diabetic Male Rats. BioMed Research International, 2020. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7683110/
15. Fernández-Lázaro, D., Mielgo-Ayuso, J., Martínez, A. C., & Seco-Calvo, J. (2020). Iron and Physical Activity: Bioavailability Enhancers, Properties of Black Pepper (Bioperine®) and Potential Applications. Nutrients, 12(6). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7353321/
16. Liu, L., Zhang, N., Tong, Y., Sun, Y., Zhu, H., Cao, Y., Zhang, J., Huang, H., Niu, B., Li, H., Guo, H., Gao, Y., Zhu, L., & Li, Y. (2017). The effectiveness of zinc supplementation in men with isolated hypogonadotropic hypogonadism. Asian Journal of Andrology, 19(3), 280-285. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5427781/
17. Jerysz, A., & Lukaszewicz, E. (2012). Effect of Dietary Selenium and Vitamin E on Ganders’ Response to Semen Collection and Ejaculate Characteristics. Biological Trace Element Research, 153(1), 196-204. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3667365/
18. Prasad, A. S., Mantzoros, C. S., Beck, F. W., Hess, J. W., & Brewer, G. J. (1996). Zinc status and serum testosterone levels of healthy adults. Nutrition (Burbank, Los Angeles County, Calif.), 12(5), 344–348. https://pubmed.ncbi.nlm.nih.gov/8875519/
19. Banihani, S. A. (2017). Vitamin B12 and Semen Quality. Biomolecules, 7(2). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5485731/
20. Shawish, M. I., & Wright, J. M. (2018). Effect of phosphodiesterase 5 inhibitors on blood pressure. The Cochrane Database of Systematic Reviews, 2019(12). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6914385/
21. Sooriyamoorthy T., Leslie S.W. [2022, November 28]. Erectile Dysfunction. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK562253/
22. A.M. Hutter, R.A. Kloner, V. Watkins, T. Costigan, A. Bedding, M. Mitchell, J. Emmick, P-302: Blood pressure and cardiovascular effects of tadalafil, a new PDE5 inhibitor, American Journal of Hypertension, Volume 15, Issue S3, April 2002, Page 140A. https://academic.oup.com/ajh/article/15/S3/140A/224968
23. Lopresti, A. L., Drummond, P. D., & Smith, S. J. (2019). A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha (Withania somnifera) in Aging, Overweight Males. American Journal of Men's Health, 13(2). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6438434/
24. Salve, J., Pate, S., Debnath, K., & Langade, D. (2019). Adaptogenic and Anxiolytic Effects of Ashwagandha Root Extract in Healthy Adults: A Double-blind, Randomized, Placebo-controlled Clinical Study. Cureus, 11(12). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6979308/
25. Sharma, A. K., Basu, I., & Singh, S. (2018). Efficacy and Safety of Ashwagandha Root Extract in Subclinical Hypothyroid Patients: A Double-Blind, Randomized Placebo-Controlled Trial. Journal of Alternative and Complementary Medicine (New York, N.Y.), 24(3), 243–248. https://pubmed.ncbi.nlm.nih.gov/28829155/
26. Pilz, S., Frisch, S., Koertke, H., Kuhn, J., Dreier, J., Obermayer-Pietsch, B., Wehr, E., & Zittermann, A. (2011). Effect of vitamin D supplementation on testosterone levels in men. Hormone and Metabolic Research = Hormon- und Stoffwechselforschung = Hormones et Metabolisme, 43(3), 223–225. https://pubmed.ncbi.nlm.nih.gov/21154195/
27. Mulhall J.P., Trost L.W., Brannigan R.E., et al: Evaluation and management of testosterone deficiency: AUA guideline. J Urol 2018; 200: 423. https://www.auanet.org/guidelines-and-quality/guidelines/testosterone-deficiency-guideline
28. Andersson, E. (2018). PDE5 inhibitors – pharmacology and clinical applications 20 years after sildenafil discovery. British Journal of Pharmacology, 175(13), 2554-2565. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6003652/
29. Altwein, J. E., & Keuler, F. U. (2001). Oral treatment of erectile dysfunction with apomorphine SL. Urologia Internationalis, 67(4), 257–263. from https://pubmed.ncbi.nlm.nih.gov/11741126/