Grape seed extract testosterone

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Absorption and metabolism
Polymeric proanthocyanidins are poorly absorbed in the small intestine of humans, and exposure may result from metabolism to phenolic acids by colonic bacteria. Any biological effects of proanthocyanidins may be due to the phenolic acid metabolites. Supplementation with grape seed polyphenols results in a consistent increase in the excretion of 3-hydroxyphenylpropionic acid  and 4-O-methylgallic acid and a less consistent increase in the excretion of 3-hydroxyphenylacetic acid. 3-HPP is a major phenolic acid breakdown product of proanthocyanidin metabolism in vivo.

Grape seed extract testosterone

grape seed extract testosterone

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