Ethyl Ascorbic Acid, or EAC in short, is an "etherified derivative of ascorbic acid," which consists of vitamin C and is of an ethyl group bound to the third carbon place. This element makes vitamin c stable and, thus, soluble not only in water but also in oil.

Ethyl ascorbic acid (EAC) is a water-soluble, stable form of vitamin C that is commonly used in skincare and sun care products: 

Benefits:

EAC has many benefits for the skin, including: 

• Antioxidant: EAC strengthens collagen and has a strong antioxidant effect. 

• Hyperpigmentation: EAC reduces melanin levels in the skin, which can cause dark spots and hyperpigmentation. 

• Skin-lightening: EAC can help lighten pigmentation and brown spots. 

• Sun damage: EAC protects the skin from sun damage. 

• Wrinkle reduction: EAC can help reduce wrinkles. 

Uses:

EAC is used in skin care products such as creams, gels, and serums, and in sun care products such as essences, face masks, and lotions. 

Chemical structure:

EAC is a more stable form of vitamin C because the ethyl group attached to it shields the 3-O group from ionization.