Chrysin is a plant flavone, a naturally occurring isoflavone extracted from the passionflower family. Research suggests that chrysin has an effect on the bulking of the body by increasing testosterone levels. Unlike some other prohormone supplements like androstenedione, chrysin does not raise testosterone production, but raises levels by blocking its breakdown into estrogens. Chrysin is believed to block the enzyme, aromatase, which makes this conversion. Using DHEA, androstenedione or anabolic steroids could cause an increased testosterone level, but this may increase estrogen levels and promote breast changes and shrinkage of testis in men. In women facial hair, a deepening of the voice or other masculine traits may occur as well as reduction in estrogen production.

Chrysin appears to be safe. The general consensus is a dosage of 1-3gm of Chrysin daily is effective to maximize the benefits from a workout. Take one half of the dosage in the morning one hour before training and the other half at bedtime. Women generally should not take chrysin.

Chrysin is poorly absorbed when taken orally, but the beneficial effects of this phytonutrient are seen when applied topically.

It is reported that absorption of chrysin, along with other nutrients, is enhanced with the concomitant use of bioperine.