Apigenin is a bioflavonoid compound (specifically a flavone) which is found in a wide variety of plants and herbs. It is very abundant in chamomile tea, and exerts anxiety-reducing effects when consumed in these high doses. At even higher doses, it may be sedative.
Apigenin is also a very potent anti-cancer compound. It beneficially protects against a wide variety of cancers with high selectivity for cancer cells as opposed to non-cancerous cells. It also has a very high safety threshold, and active (anti-cancer) doses can be gained through consuming a vegetable and fruit rich diet.