Sexual Function Research Analysis

Summary of Sexual Function

Scientific Information on Sexual Function

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect sexual function

Grade	Level of Evidence [show legend]
	Robust research conducted with repeated double-blind clinical trials
	Multiple studies where at least two are double-blind and placebo controlled
	Single double-blind study or multiple cohort studies
	Uncontrolled or observational studies only

Outcome	Magnitude of effect ? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.	Consistency of research results ? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.	Notes
Maca	Minor	Very High See 2 studies	An improvement in SSRI induced sexual dysfunction has been noted with Maca supplementation
Saffron	Minor	Moderate See 2 studies	SSRI related sexual dysfunction in both men and women appears to be reduced with coingestion of saffron, although saffron does not alter the efficacy of SSRI therapy on depression.
Velvet Antler	-	- See study	No discernible effect on sexual function in older, healthy men.
Vitamin E	-	- See study	Vitamin E does not appear to influence sexual function or satisfaction in otherwise healthy persons with no known sexuality disorders.
Saw Palmetto
Tribulus terrestris

All comparative evidence is now gathered in our A-to-Z Supplement Reference.

The evidence for each separate supplement is still freely available here.