Saw Palmetto Extract 4:1, Phytosterol Complex , and Beta Sitosterol - Extracts of Saw Palmetto block 5-alpha-reductase. Also, the liposterolic extract of saw palmetto combined with beta-sitosterol (a phytosterol common to many plants and grains) leads to greater 5-alpha blocking.
Advecia Contains: 37.5 mg, 125 mg, and 50 mg

Green Tea Extract - Compounds from tea affect type I 5-alpha-reductase activity.
Advecia Contains: 600 mg

L-Lysine - Has been shown to inhibit 5-alpha-reductase.
Advecia Contains: 600 mg

L-Arginine - Hair follicles use nitric oxide to maintain and promote new hair growth. L-arginine is required to produce nitric oxide.
Advecia Contains: 1500 mg

Grape Seed Extract and Proanthocyanidins/Procyanidins - Procyanidin B-2 and procyanidin B-3 directly stimulate epithelial cell growth and inhibit the growth-inhibiting effect caused by TGF-beta2.
Advecia Contains: 265 mg and 250 mg