JellyFil Official Website › Guide
GuideA Guide to Men’s Vitality Supplements: What Is In Them and What Was Measured
Men's vitality supplements are built from a short list of plants and amino acids that recurs across almost every product in the category. This guide covers what that list is, what the published trials behind each item actually measured and at what dose, why proprietary blends dominate the shelf, and what the adulteration record means for buyers.
Written without a product in it. The checklist that follows from it is a separate page, and it is applied to this desk's own bottle at the end.
What is actually in a men’s vitality supplement
Pull apart thirty products in this category and the same names keep appearing. An audit of the thirty-two best-selling US products did exactly that: thirty-seven distinct ingredients across sixteen testosterone products and sixteen erectile-function products, with tribulus, Eurycoma longifolia, zinc, l-arginine, aspartate, horny goat weed and yohimbine the most common.
The same audit scored each ingredient against the randomised evidence. Nineteen per cent earned a top grade for consistent positive results in two or more trials. Sixty-eight per cent scored C or D for contradictory, negative or absent evidence. And no finished product in the set had a published trial of its own.
That last sentence is the most useful thing in this guide. Whatever a bottle claims, the claim rests on its ingredients rather than on the product, and the ingredients have been studied one at a time, in amounts that are usually printed nowhere on the bottle.
The amino acids, and why the doses are so large
Arginine and citrulline are the two that turn up most. Both are precursors in the nitric oxide pathway, which relaxes the smooth muscle in a vessel wall.
The arginine trial usually quoted is five grams a day for six weeks. Nine of twenty-nine men reported subjective improvement, all of them men who started with low nitric oxide output, and the measured haemodynamics did not change. The pooled meta-analysis, as corrected covers trials from 1.5 g to 5 g a day.
Two things follow. Oral arginine is an inefficient route, so a large share of any dose never reaches the circulation. And a gram-scale ingredient cannot be meaningfully delivered inside a blend measured in tens of milligrams, which is the situation on most gummies and many capsules.
The adaptogens, and what they were actually measured on
Maca and ashwagandha are the two with the cleanest human data, and both are frequently described in marketing as doing something they were not measured doing.
Maca's twelve-week randomised trial gave 1,500 or 3,000 mg a day and found self-rated desire rose from week eight, with testosterone and oestradiol unchanged and the effect independent of mood. A dose-finding study found 3 g worked where 1.5 g did not. The systematic review calls the evidence limited, which is fair.
Ashwagandha's crossover trial in overweight men aged 40 to 70 used a standardised extract delivering 21 mg of withanolide glycosides a day. Testosterone rose 14.7% more than placebo and DHEA-S 18% more, while fatigue, vigour and sexual well-being showed no between-group difference. Both halves are the finding, and marketing usually quotes one.
The practical lesson: the outcome measured is rarely the outcome advertised, and the standardisation matters as much as the milligrams.
The plants with more folklore than evidence
Muira puama, catuaba and several others in this category rest on traditional use and animal pharmacology.
The review of native Brazilian plants used for male sexual difficulty places both in the same position: ethnomedicinal use, animal models, plausible mechanisms, and no dose-controlled human trial. Catuaba specifically has antioxidant and antifatigue work in animals, and muira puama has a constituent analysis.
None of that makes them worthless and all of it makes them unverifiable from a label. The honest position is that they are traditional ingredients whose effect in a person has not been measured, and a product that leans on them is leaning on history.
Tribulus, horny goat weed, and the one bench result worth knowing
These two are worth taking together, because a single experiment sets them against each other neatly.
When four plants traditionally used for impotence were screened against human PDE5A1, only Epimedium and its active principle icariin were active. Tribulus terrestris, which appears on far more labels, showed nothing in the same assay. Modified icariin derivatives in that paper approached sildenafil's potency in the enzyme test.
On the clinical side, the tribulus meta-analysis found questionnaire scores beat placebo while total testosterone showed no difference between groups, and the six-week trial at 770 mg a day found the same on the hormone side.
So the most common label claim in the category, that a plant raises testosterone, is the one the evidence supports least, and the plant with the clearest mechanism is one of the less commonly advertised.
Why proprietary blends are everywhere
Because 21 CFR 101.36 permits them. A dietary supplement may declare a proprietary blend as a single total, listing the contents in descending order of weight, without stating an amount for each.
The stated reason is commercial confidentiality. The effect on a buyer is that no ingredient can be checked against any trial, because the trial has a number and the label does not.
Two things are still readable. The order is a real ranking by weight. And the total sets a ceiling: if a blend is 80 mg, no plant inside it is at 500 mg, whatever the marketing implies.
A blend is not a red flag on its own. A blend whose total is far below every trial dose behind its named ingredients, sold with claims drawn from those trials, is a different matter.
The adulteration problem, stated plainly
This is the category's own specific risk and it is documented rather than theoretical.
A review of synthetic PDE5 inhibitors found as adulterants catalogues the prescription drugs and untested analogues turning up in products sold as herbal. A survey of online and offline sellers across three years found the same pattern in the market rather than in a laboratory.
Why it matters beyond dishonesty: the drug class involved interacts with nitrates, and a man taking a nitrate who swallows an undeclared one has no way of knowing. That is the argument for buying where the batch is stated and the seller is reachable, in a category where that is not universal.
What the evidence base looks like as a whole
Three recent syntheses give the shape of it.
The network meta-analysis of nutraceutical interventions pools what randomised evidence exists for the common ingredients. The 2026 meta-analysis of herbal supplements does the same for herbal products specifically. The analysis of marketed products compares what is on sale with what has been tested.
The consistent finding across all three, and across the ingredient audit, is a gap: reasonable evidence for a handful of single ingredients at specific doses, almost none for the products people actually buy.
NCCIH guidance on using supplements sensibly is the right general framing, and a clinician is the right person to ask about a specific medicine.
When a supplement is the wrong answer entirely
Erectile difficulty that is new, that came on quickly, or that is worsening month by month is treated in the Princeton IV consensus as a cardiovascular marker worth investigating. The vessels involved are small and they show a problem before larger ones do.
The patient-facing summary sets out what a clinician will look at: medication, blood pressure, blood sugar, sleep, alcohol and mood among them. Several of those are fixable and none of them is fixed by a bottle.
That is not an argument against supplements. It is an argument against a supplement being the first thing tried when something has changed suddenly.
Everything this guide was built from
- Kuchakulla M, Narasimman M, Soni Y, et al. A systematic review and evidence-based analysis of ingredients in popular male testosterone and erectile dysfunction supplements. Int J Impot Res. 2021;33(3):311-317. Thirty-seven ingredients across the thirty-two best-selling products; no finished product had a published trial of its own, and 68% of ingredients scored C or D for contradictory, negative or absent evidence. PMID 32358510. https://pubmed.ncbi.nlm.nih.gov/32358510/
- Ho CY, Hsu CH, Chien TJ. Herbal dietary supplements for erectile dysfunction: A systematic review and meta-analysis of randomized-controlled trials. J Tradit Complement Med. 2026;16(1):109-120. PMID 41696741. https://pubmed.ncbi.nlm.nih.gov/41696741/
- Barbonetti A, Tienforti D, Antolini F, et al. Nutraceutical interventions for erectile dysfunction: a systematic review and network meta-analysis. J Sex Med. 2024;21(11):1054-1063. PMID 39279185. https://pubmed.ncbi.nlm.nih.gov/39279185/
- Petre GC, Francini-Pesenti F, Vitagliano A, et al. Dietary Supplements for Erectile Dysfunction: Analysis of Marketed Products, Systematic Review, Meta-Analysis and Rational Use. Nutrients. 2023;15(17):3677. PMID 37686709. https://pubmed.ncbi.nlm.nih.gov/37686709/
- Chen J, Wollman Y, Chernichovsky T, et al. Effect of oral administration of high-dose nitric oxide donor L-arginine in men with organic erectile dysfunction: results of a double-blind, randomized, placebo-controlled study. BJU Int. 1999;83(3):269-73. Fifty men, 5 g a day for six weeks; nine of twenty-nine reported subjective improvement, all of them men who started with low nitric oxide excretion, and the measured haemodynamics did not change. PMID 10233492. https://pubmed.ncbi.nlm.nih.gov/10233492/
- Rhim HC, Kim MS, Park YJ, et al. The Potential Role of Arginine Supplements on Erectile Dysfunction: A Systemic Review and Meta-Analysis. J Sex Med. 2019;16(2):223-234. The paper carries a published erratum, which is noted here rather than hidden. Doses in the pooled trials run from 1.5 g to 5 g a day. PMID 30770070. https://pubmed.ncbi.nlm.nih.gov/30770070/
- Schwedhelm E, Maas R, Freese R, et al. Pharmacokinetic and pharmacodynamic properties of oral L-citrulline and L-arginine: impact on nitric oxide metabolism. Br J Clin Pharmacol. 2008;65(1):51-9. Oral arginine is the inefficient route: much of a dose is lost before it reaches the circulation. PMID 17662090. https://pubmed.ncbi.nlm.nih.gov/17662090/
- Gonzales GF, Cordova A, Vega K, et al. Effect of Lepidium meyenii (MACA) on sexual desire and its absent relationship with serum testosterone levels in adult healthy men. Andrologia. 2002;34(6):367-72. Men aged 21-56 took 1,500 mg or 3,000 mg a day for twelve weeks; self-reported desire improved from week eight and testosterone did not move. PMID 12472620. https://pubmed.ncbi.nlm.nih.gov/12472620/
- Dording CM, Fisher L, Papakostas G, et al. A double-blind, randomized, pilot dose-finding study of maca root (L. meyenii) for the management of SSRI-induced sexual dysfunction. CNS Neurosci Ther. 2008;14(3):182-91. 3.0 g a day moved the questionnaire scores; 1.5 g a day did not. PMID 18801111. https://pubmed.ncbi.nlm.nih.gov/18801111/
- Shin BC, Lee MS, Yang EJ, et al. Maca (L. meyenii) for improving sexual function: a systematic review. BMC Complement Altern Med. 2010;10:44. Four randomised trials, small, and the authors call the evidence limited. PMID 20691074. https://pubmed.ncbi.nlm.nih.gov/20691074/
- Lopresti AL, Drummond PD, Smith SJ. A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha (Withania somnifera) in Aging, Overweight Males. Am J Mens Health. 2019;13(2):1557988319835985. A standardised extract delivering 21 mg of withanolide glycosides a day for eight weeks; testosterone rose 14.7% more than placebo, while fatigue, vigour and sexual well-being showed no between-group difference. PMID 30854916. https://pubmed.ncbi.nlm.nih.gov/30854916/
- Martins NO, de Brito IM, Araujo SSO, et al. Antioxidant, anticholinesterase and antifatigue effects of Trichilia catigua (catuaba). BMC Complement Altern Med. 2018;18(1):172. Animal work. PMID 29866157. https://pubmed.ncbi.nlm.nih.gov/29866157/
- Teixeira TM, Boeff DD, de Oliveira Carvalho L, et al. The traditional use of native Brazilian plants for male sexual dysfunction: Evidence from ethnomedicinal applications, animal models, and possible mechanisms of action. J Ethnopharmacol. 2024;318(Pt A):116876. Catuaba and muira puama are both covered, and both rest mainly on animal models. PMID 37437795. https://pubmed.ncbi.nlm.nih.gov/37437795/
- Tian X, Guo S, He K, et al. Qualitative and quantitative analysis of chemical constituents of Ptychopetalum olacoides Benth. Nat Prod Res. 2018;32(3):354-357. A chemistry paper: it establishes what is in the bark, not what the bark does in a person. PMID 28750557. https://pubmed.ncbi.nlm.nih.gov/28750557/
- Dell'Agli M, Galli GV, Dal Cero E, et al. Potent inhibition of human phosphodiesterase-5 by icariin derivatives. J Nat Prod. 2008;71(9):1513-7. Four plants traditionally used for impotence were screened against human PDE5A1. Only Epimedium and its icariin were active; Tribulus terrestris showed nothing. PMID 18778098. https://pubmed.ncbi.nlm.nih.gov/18778098/
- Suharyani S, Amanda B, Angellee J, et al. Tribulus terrestris for management of patients with erectile dysfunction: a systematic review and meta-analysis of randomized trials. Int J Impot Res. 2026;38(1):11-18. Eight trials: questionnaire scores beat placebo, and total testosterone did not differ between the groups. PMID 40360723. https://pubmed.ncbi.nlm.nih.gov/40360723/
- Fernandez-Lazaro D, Mielgo-Ayuso J, Del Valle Soto M, et al. The Effects of 6 Weeks of Tribulus terrestris L. Supplementation on Body Composition, Hormonal Response, Perceived Exertion, and CrossFit Performance: A Randomized, Single-Blind, Placebo-Controlled Study. Nutrients. 2021;13(11):3969. Thirty trained men, 770 mg a day for six weeks. PMID 34836225. https://pubmed.ncbi.nlm.nih.gov/34836225/
- 21 CFR 101.36, Nutrition labeling of dietary supplements. US Government Publishing Office. The rule that lets a label state one total for a proprietary blend and list its contents in descending order of weight without an amount for each. https://www.govinfo.gov/content/pkg/CFR-2023-title21-vol2/xml/CFR-2023-title21-vol2-sec101-36.xml
- Kee CL, Ge X, Gilard V, et al. A review of synthetic phosphodiesterase type 5 inhibitors (PDE-5i) found as adulterants in dietary supplements. J Pharm Biomed Anal. 2018;147:250-277. PMID 28903860. https://pubmed.ncbi.nlm.nih.gov/28903860/
- Lee JH, Park HN, Park OR, et al. Screening of illegal sexual enhancement supplements and counterfeit drugs sold in the online and offline markets between 2014 and 2017. Forensic Sci Int. 2019;298:10-19. PMID 30870700. https://pubmed.ncbi.nlm.nih.gov/30870700/
- National Center for Complementary and Integrative Health. Using Dietary Supplements Wisely. National Institutes of Health. https://www.nccih.nih.gov/health/using-dietary-supplements-wisely
- Rosen RC, Miner M, Burnett AL, et al. Proceedings of PRINCETON IV: PDE5 inhibitors and cardiac health symposium. Sex Med Rev. 2024;12(4):681-709. The consensus that treats erectile difficulty as a cardiovascular marker worth assessing rather than a standalone complaint. PMID 38936840. https://pubmed.ncbi.nlm.nih.gov/38936840/
- MedlinePlus. Erectile Dysfunction. US National Library of Medicine, National Institutes of Health. What the causes usually are, and when it is a reason to be examined rather than to buy something. https://medlineplus.gov/erectiledysfunction.html
