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Yam Extract
Wild yam extract is often used today as a PMS remedy, and many patients using it have reported relief from menopausal symptoms.

Wild yam extract contains a substance called diosgenin that allows it to imitate certain hormones, such as progesterone, thereby helping correct hormonal imbalances in the body.

This is the assumed mechanism by which wild yam extract appears to work as a PMS remedy and other menopausal symptoms.
 
Yohimbe (Yohimbine)
Yohimbe comes from the bark of an African tree. Yohimbe is a popular herb percieved as a stimulant and aphrodisiac. Yohimbe contains yohimbine, an alkaloid similar to caffeine in it's energizing effects.