Chasteberry (also called vitex) has recently gained attention as a way to boost the natural production of testosterone in men. Chasteberry contains flavonoids, terpenes, and sterols, all phy-tochemicals known for drug-like effects. The particular phytochemicals in chasteberry have been suggested to raise testosterone concentrations and therefore build muscle mass and strength. While early investigations suggest that testosterone concentrations may increase modestly in men supplementing with chasteberry, it is not known whether this will translate into improved muscle building or strength. In fact, the small increases seen in testosterone concentrations with some herbal formulae are not typically correlated with improvements in muscle mass unless an individual is hypogonadal (producing too little testosterone naturally).

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