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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.

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Human Effect Matrix

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The Human Effect Matrix looks at human studies to tell you what supplements affect Penile Girth.

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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 more evidence, the more we can trust the results.
Supplement 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 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 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 Minor - See study
In men with erectile dysfunction, saffron appeared to increase nighttime tumescence at both the tip and base.

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grade-d  

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