Can you use vitamin C with glycolic acid?
Both are low-pH actives — combine only with care. Vitamin C in the morning, glycolic acid at night is the easier path.
Why
Vitamin C requires low pH to remain stable; glycolic acid is also low pH. Stacking them doesn't deactivate either, but the cumulative acid load can irritate, especially for sensitive skin.
How to layer them
Standard approach: vitamin C AM, glycolic acid PM. If both PM, vitamin C first, wait 30 minutes, then glycolic acid. Beginners shouldn't combine these at all in the first 3 months.
Frequently asked questions
Can you use vitamin C with glycolic acid?
Both are low-pH actives — combine only with care. Vitamin C in the morning, glycolic acid at night is the easier path.
What happens if you mix vitamin C and glycolic acid?
Vitamin C requires low pH to remain stable; glycolic acid is also low pH. Stacking them doesn't deactivate either, but the cumulative acid load can irritate, especially for sensitive skin.
How should you layer vitamin C and glycolic acid?
Standard approach: vitamin C AM, glycolic acid PM. If both PM, vitamin C first, wait 30 minutes, then glycolic acid. Beginners shouldn't combine these at all in the first 3 months.