Men's Wellness Research and Evidence

How much has been published?

The table shows how many records PubMed (the US National Library of Medicine's index of biomedical research) returned on 2026-10-22 for each search, using the NCBI E-utilities service. [1] "Randomized trials" counts records also tagged as randomized controlled trials. [1]

The "randomized trials" column used the same query combined with AND randomized controlled trial[pt]. [1]

What the counts do and do not mean

Counts show how much has been published, not whether a treatment works. A large number of records can include animal studies, case reports, opinion pieces and studies of surgery or lab methods. A small number can mean a new or niche topic. For example, there are far fewer records on saw palmetto than on BPH overall, and very few on "testosterone boosters" as a phrase, even though these products are heavily marketed. [1] Counts also change daily as new records are added.

What the better studies say so far

• Saw palmetto and urinary symptoms: a Cochrane review of 27 studies found little to no benefit when used alone. [2]
• Testosterone boosters: a review of 52 studies of 27 proposed boosters found most fail to raise total testosterone. [3]
• Testosterone therapy: the TRAVERSE randomized trial of 5,246 men found testosterone gel noninferior to placebo for major cardiac events, with more atrial fibrillation, kidney injury and pulmonary embolism. [4]
• Lifestyle and ED: a meta-analysis of 16 randomized trials found a modest, significant improvement with diet and/or exercise. [5]

How to judge a study about men's health

1. Who was studied? Men with confirmed testosterone deficiency, men with ED, or healthy volunteers? A result in one group may not apply to another. For example, a sleep restriction study was in ten healthy young men. [6]
2. Lab number or real benefit? Higher blood testosterone is not the same as better sexual function, energy or strength. A review of fenugreek found a small rise in total testosterone but very low certainty and no support for commercial claims. [7]
3. Randomized or observational? Randomized trials compare a treatment with placebo; observational studies find associations, such as ED and heart events. [8]
4. How big and how long? Short trials with few men are weak evidence. [9]
5. Who paid, and what exactly was tested? In the saw palmetto review, 10 of 27 studies were funded by the pharmaceutical industry, two by government agencies and the rest did not say. [2] An extract tested in one trial is not the same as another product's blend.
6. Does it include harms? For example, the TRAVERSE trial reported harms alongside its main result. [4]

Find studies in the Research Library. Compare product claims using Evaluating safety claims and see the claim check on testosterone boosters.

Where the evidence is thin

• Alcohol and testosterone: proper evidence not found in the sources read for this section.
• "Male fertility blends" and prostate "health blends": not evaluated in the sources read; the Cochrane saw palmetto review notes uncertainty about combination products. [2]
• Long-term safety of most "booster" ingredients: not covered by the reviews read.