Saffron is a well-known culinary herb that has been used for centuries but has only recently been scientifically studied. Recent research indicates that saffron can help to support a positive mood, a relaxed attitude, and may also promote restful sleep. Other studies suggest that saffron may help to support a balanced immune response and is a powerful free radical neutralizer. NOW uses only whole saffron stigma powder, not an extract. Natural color variation may occur in this product.