Is FDA had approve keratin

The FDA does not specifically approve keratin as a standalone ingredient, as it is a naturally occurring protein found in hair, skin, and nails. However, keratin is commonly used in various cosmetic products, such as shampoos and hair treatments, which must meet safety and labeling regulations enforced by the FDA. While the FDA monitors these products, it does not conduct pre-market approval for all cosmetic ingredients. Therefore, keratin itself is not "approved" but can be used in products that comply with FDA regulations.