One of the most popular derivatives is tetrahexyldecyl ascorbate (often called THD-ascorbate ... It has been the gold-standard vitamin-C serum for years, so much so that lots of formulas ...

Containing 14% tetrahexyldecyl ascorbate, a potent form of vitamin C and double the amount in the original Medik8 C-Tetra ...

Tetrahexyldecyl ascorbate is fat-soluble and therefore better ... you can release it into the serum, give it a shake and it’s ready to go.