Overview Progesterone is a hormone that occurs naturally in the body. It can also be made in a laboratory. "Progestin" is a general term for a subs...

Overview Yohimbe is the name of an evergreen tree found in parts of central and western Africa. The bark of yohimbe contains a chemical called yohi...

Overview Lutein is a type of vitamin called a carotenoid. It is related to beta-carotene and vitamin A. Foods rich in lutein include egg yolks, bro...

Overview Glucosamine is an amino sugar that is produced naturally in humans. It is also found in seashells, or it can be made in the laboratory. Gl...

Overview Fenugreek is an herb that is similar to clover. It is native to the Mediterranean region, southern Europe, and western Asia. The seeds are...

Overview Arnica is an herb that grows mainly in Siberia and central Europe, as well as temperate climates in North America. The flowers of the plan...

Overview Lemongrass is a plant. The leaves and the oil are used to make medicine. Lemongrass is commonly taken orally, applied directly to the skin...

Overview Brewer's yeast is a kind of yeast that is a by-product of brewing beer. Dietary supplements containing brewer's yeast often contain non-li...

Overview Native collagen type II is a protein that is part of cartilage, bone, and other tissues in animals and humans. Most collagen type II in su...

Overview Elderflower is the flower of a tree. An extract of the flower is used to make medicine. Elderflower is used for swollen sinuses (sinusitis...