What percent L-ascorbic acid is best for collagen production?

If by percent of L ascorbic acid, you mean a topical Vitamin C serum, the number is between 10 and 20%.Look for combinations containing L-ascorbic acid, tocopherol (vitamin E) or glutathione, and ferulic acid.

If you consume a good amount of fruits and vegetables every single day, you absolutely do not need to supplement yourself with vitamin C also known as ascorbic acid. Vitamin C should be supplemented only when a person gets sick because it does help them get over the hump of the illness. I hope this helps and good luck from York City Plastic Surgery

L-Ascorbic acid has very little to do with collagen production. It s used in skin care, however, for multiple other reasons. It is acidic and, therefore, works well as a pH balancer, one of the basic functions of good skin care. It is also a good antioxidant and anti-inflammatory, stabilizes the lipid cell membrane of skin cells, and reduces pigmentation. For these reasons, it is one of my favorite skin care products.