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Penile Girth

Penile girth refers to the (usually flaccid) thickness of penile tissue, and appears to be positively modulated by agents that interact with dopamine or blood flow. It is somewhat related to the supplementations that promote erections.

Kamal
Research analysis lead by Kamal Patel
All content reviewed by Examine.com Team. Published:
Last Updated:

Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect penile girth
Grade Level of Evidence
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
Level of Evidence
? The amount of high quality evidence. The mo re evidence, the more we can trust the results.
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
grade-c L-DOPA Minor - See 2 studies
An increase in penile girth has been noted in the flaccid state at rest, which is no longer present during sexual stimulation.
grade-c Nicotine Minor - See study
A decrease in penile girth in the flaccid state is noted, which is thought to be secondary to reduced blood flow
grade-d Saffron Minor - See study
In men with erectile dysfunction, saffron appeared to increase nighttime tumescence at both the tip and base.
grade-d Yohimbine Minor - See study
An increase in penile girth has been noted (similar to L-DOPA) which was not to a large degree, only detectable when dividing the group into responders and nonresponders

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

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