Peptides AcademyVitamin C (Ascorbic Acid)
How to Use
Vitamin C (ascorbic acid) is incompatible with copper peptides — separate by 8+ hours or use on alternate days. Compatible with Matrixyl, Argireline, and most other peptides. Vitamin C derivatives (MAP, SAP) have weaker evidence of copper interaction.
AM
Vitamin C serum → Matrixyl/Argireline peptide → moisturizer → SPF
PM
GHK-Cu serum → peptide moisturizer (no vitamin C)
Best For
Where this entry is most relevant.
skin-glow
Vitamin C inhibits tyrosinase, reducing melanin production and brightening overall skin tone
anti-aging
As a cofactor for prolyl and lysyl hydroxylase, vitamin C is essential for stable collagen triple-helix formation
What is it?
A potent antioxidant and essential cofactor for collagen synthesis. In skincare, L-ascorbic acid at pH <3.5 is the most effective form, providing photoprotection, brightening, and collagen support. Critical interaction: incompatible with copper peptides (GHK-Cu).
How It Works
- 1
Free radical neutralization
Ascorbic acid donates electrons to neutralize reactive oxygen species from UV exposure and environmental pollutants
- 2
Collagen hydroxylation
Serves as an essential cofactor for prolyl-4-hydroxylase and lysyl hydroxylase — enzymes required for stable collagen cross-linking
- 3
Melanin inhibition
Inhibits tyrosinase activity and reduces o-DOPA quinone, decreasing melanin production and reducing hyperpigmentation
- 4
Photoprotection synergy
Enhances SPF efficacy when layered under sunscreen — addresses free radical damage that physical/chemical filters miss
Role
Antioxidant, collagen cofactor, brightening agent
Evidence
Extensive clinical evidence for photoprotection, hyperpigmentation reduction, and collagen stimulation. L-ascorbic acid at 10–20% is the most studied form.
Common Formats
How this shows up in practice.
Skinceuticals C E Ferulic
Serum
The benchmark: 15% L-ascorbic acid + vitamin E + ferulic acid
Timeless 20% Vitamin C + E + Ferulic Acid
Serum
Budget alternative with the same core formula
Paula's Choice C15 Super Booster
Serum
15% ascorbic acid in a stabilized formulation