Vitamin C + Lactic Acid (AHA)

Can you use Vitamin C with Lactic Acid?

Yes, with timing

Yes, with timing. Use vitamin C in the morning and Lactic Acid at night.

Why

Both are acidic. Layering them back-to-back is not dangerous but more likely to sting. Separating them is the cautious approach.

How to use them together

  1. AM: vitamin C, moisturizer, sunscreen.
  2. PM (a few nights a week): Lactic Acid, moisturizer.

Who should be careful

Sensitive skin should introduce one at a time.

About the ingredients

Vitamin C: An antioxidant (L-ascorbic acid and derivatives) used for brightening and protection against UV-related oxidative stress. Pure L-ascorbic acid serums are acidic and can sting.

Lactic Acid (AHA): A gentler alpha hydroxy acid with a larger molecule than glycolic acid. Exfoliates and helps hydrate. Like all AHAs, it can increase sun sensitivity.

FAQ

Can I use Vitamin C and Lactic Acid together?

Yes, with timing. Use vitamin C in the morning and Lactic Acid at night.

Should I use Vitamin C or Lactic Acid in the morning or at night?

AM: vitamin C, moisturizer, sunscreen. PM (a few nights a week): Lactic Acid, moisturizer.

Who should be careful combining Vitamin C and Lactic Acid?

Sensitive skin should introduce one at a time.

What if my skin gets irritated using Vitamin C and Lactic Acid?

Stop the stronger active, keep a gentle cleanser, moisturizer and sunscreen, and reintroduce one product at a time once skin calms down. See a dermatologist if irritation persists.

Sources

Studies and reviews on these ingredients and, where available, on this specific combination.

  1. Pullar JM, Carr AC, Vissers MCM. The roles of vitamin C in skin health. Nutrients. 2017;9(8):866.
  2. Al-Niaimi F, Chiam NYZ. Topical vitamin C and the skin: mechanisms of action and clinical applications. J Clin Aesthet Dermatol. 2017;10(7):14-17.
  3. Kornhauser A, Coelho SG, Hearing VJ. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clin Cosmet Investig Dermatol. 2010;3:135-142.

Last reviewed: . Not medical advice.

Related combinations