Back to Ingredient Dictionary

CYSTINE

Description

Cystine is a non-essential amino acid composed of two cysteine molecules linked by a disulfide bond. This unique structure contributes to its significant role in maintaining skin health and integrity. Cystine is a crucial component of keratin, the primary structural protein in hair, nails, and the outer layer of skin.

In skincare formulations, cystine functions as a potent antioxidant, helping to neutralize free radicals and protect skin cells from oxidative stress. It plays a vital role in collagen synthesis, supporting skin elasticity and firmness. Cystine also aids in the production of glutathione, a powerful intracellular antioxidant that helps maintain overall skin health.

Topical application of cystine can help strengthen the skin barrier, improve moisture retention, and enhance the skin's natural repair processes. It is particularly beneficial for addressing concerns related to aging skin, such as fine lines and wrinkles. Additionally, cystine supports wound healing and may help in managing skin conditions characterized by compromised barrier function.

When formulating with cystine, it is typically used in concentrations ranging from 0.1% to 1%, depending on the specific product and desired effects. Its stability in skincare formulations is generally good, but proper pH adjustment may be necessary to optimize its efficacy.