LEVEL 2
Complete Vitamin C Guide
Vitamin C's effects are impressive, but there's one problem: pure vitamin C (L-ascorbic acid) is extremely unstable, oxidizing quickly when exposed to air and light. "Vitamin C derivatives" were developed to solve this problem.
L-ascorbic acid works directly without conversion, making it the most immediate and effective form. However, it oxidizes easily and requires pH below 3.5 for skin penetration. Cold, dark storage after opening is essential.
Ascorbyl glucoside bonds glucose to vitamin C, creating a water-soluble derivative with very high stability. Skin enzymes remove the glucose to release active vitamin C, though conversion efficiency remains a challenge.
APPS is an amphipathic derivative with both water- and oil-soluble properties. It's said to have approximately 100x the penetration power of regular vitamin C, potentially reaching the dermis. However, it requires enzymatic conversion, and while more stable than pure form, stability isn't perfect.
VC-Ethyl (3-O-ethyl ascorbic acid) is the most notable vitamin C derivative today. No enzymatic conversion needed -- it acts directly as vitamin C. It combines high stability, penetration, and immediacy -- the "best of all worlds" derivative.
As you can see, "contains vitamin C" doesn't tell the whole story -- which form is used dramatically changes the effects. Next level covers the science of "concentration" and "pH" for maximum efficacy.
KAIAN develops evidence-based vitamin C skincare products.
Feel free to reach out with questions about ingredients and formulations.
