3-O-Ethyl Ascorbic Acid
3-O-Ethyl Ascorbic Acid (EAC) is an etherified derivative of ascorbic acid in which an ethyl group is bound to the third carbon position of the vitamin C molecule. This modification makes it highly stable and soluble in both water and oil, overcoming a key limitation of pure ascorbic acid. It is claimed to be metabolized in the skin back into pure ascorbic acid, with an ascorbic acid content of approximately 86.4% — notably higher than the 50–60% typical of other vitamin C derivatives.
EAC is reported to provide antioxidant and anti-inflammatory effects, support collagen production, and deliver skin-brightening benefits. Clinical in-vivo data (2% EAC) supports improvement in skin tone and skin whitening. It also shows better skin penetration than some other vitamin C derivatives such as Ascorbyl Glucoside, based on animal study data.
Collagen-boosting and conversion-to-ascorbic-acid claims rely primarily on manufacturer data rather than independent clinical studies. Overall, the source characterizes EAC as "very promising but not fully proven."
![MEDICUBE [Subscr.] TXA Niacinamide Capsule Cream](/_next/image?url=https%3A%2F%2Fcdn.shopify.com%2Fs%2Ffiles%2F1%2F0156%2F3905%2F2336%2Ffiles%2FTXA_00_84831587-cfc2-4ab9-b4a3-c98f0964cc41.jpg%3Fv%3D1744941371&w=3840&q=75)
![MEDICUBE [Subscr.] Deep Vita C Capsule Cream](/_next/image?url=https%3A%2F%2Fcdn.shopify.com%2Fs%2Ffiles%2F1%2F0156%2F3905%2F2336%2Ffiles%2Fc096afcff419378df8afcb96182a4365.jpg%3Fv%3D1768373336&w=3840&q=75)
![MEDICUBE [Subscr.] Deep Vita C Pads](/_next/image?url=https%3A%2F%2Fcdn.shopify.com%2Fs%2Ffiles%2F1%2F0156%2F3905%2F2336%2Ffiles%2F00_af47f07a-841c-43cd-a1c5-7c79c501dfd7.jpg%3Fv%3D1765243771&w=3840&q=75)
![MEDICUBE [Subscr.] AGE-R Vita K Cream](/_next/image?url=https%3A%2F%2Fcdn.shopify.com%2Fs%2Ffiles%2F1%2F0156%2F3905%2F2336%2Ffiles%2Fk_00.jpg%3Fv%3D1766558160&w=3840&q=75)
