To block dihydrotestosterone naturally, evidence indicates a man can use saw palmetto, pygeum, pumpkin seed oil and nettles, according to About.com. By lowering the amount of dihydrotestosterone in the blood, people can fight hair loss from the inside instead of using topical treatments.
Saw palmetto comes from a small palm tree found in the southeastern United States, explains About.com. When taken orally, supplements made of the berries of the tree help to block dihydrotestosterone. Another tree, pygeum africanum, or the African cherry tree, is also effective at blocking dihydrotestosterone. People have used pygeum since the 1700s for medicinal reasons, and when men take this supplement with saw palmetto, there is a drastic loss of dihydrotestosterone in the body.
Pumpkin seed oil can also block dihydrotestosterone, states About.com. Pumpkin seed oil has a steroid, delta-7 sterine, that stops dihydrotestosterone from building up in the follicles of the hair. People take this oil orally, but many apply it directly to the scalp. Stinging nettles, however, must not go on the skin, but when taken by mouth, it also helps to block dihydrotestosterone in the body. Men find even greater benefits when combining stinging nettles with saw palmetto and pygeum.
With these and all natural supplements, the key to success is to be consistent, claims About.com. To help the hair grow faster and stronger, people can also take vitamin C, vitamin A, niacin, vitamin B-12 and iron supplements.