Arginine is a proteinogenic amino acid found in red algae, buckwheat, and human skin. Arginine supports the regeneration of the skin's moisture-binding system and has a relaxing effect on the skin. In addition, it's one of the NMFs (natural moisturizing factors) and supports hydration while enhancing the anchoring and adsorption of other NMFs like PCA.

L-Arginine leaves many essential physiological effects, such as stimulating collagen production and involvement in the cellular immune response and tissue repair. In addition, it improves barrier function while acting as a neutralizer, viscosity modifier, and aesthetic enhancer (improves the sensory profile of formulation). Arginine is also used as a skin and hair conditioner, lessening the irritation potential of preparation.

This amino acid promotes the dilation of capillaries. L-Arginine is essential for creating nitric oxide in the human body, which directly helps improve circulation. The topical application of L-Arginine dilates the blood vessels in the lips, increasing blood flow to the area, thus engorging the lips with blood and expanding the lip size and color.

In hair care applications Arginine moisturizes, conditions, and improves PCA adsorption. It is especially effective in combination with other amino acids, exposing healthy and shiny hair with increased tensile strength.