L-arginine is a non-essential amino acid, or protein building block. “Non-essential” means our bodies can make the amino acid without dietary consumption. L-arginine enhances Nitric Oxide in our bodies. Nitric Oxide leads to the production of nitrogen monoxide which acts as a signaling molecule for dermal papilla cells in the hair follicle. Nitric Oxide can also act as a vasodilator allowing more blood circulation to reach the skin and hair. The presence of L-arginine can promote and maintain the health and growth of hair.


United States


Hair growth


Signals Follicles

Increases Blood Flow

Delivers Nutrients

There are over 15,000 studies on L-Arginine and we’re always looking for more.

We love reviewing research, and we’d love to learn from you too. If you come across an interesting study and want to share it, please send it to us at 

Impact of L-arginine on androgenetic alopecia: Current clinical data evaluation. Dermatest View
Drug that causes hair loss and promotes hair growth-A review. Research Gate View
Arginine derived nitric oxide: Key to healthy skin. Springer View