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Can You Use Vitamin C With AHA? The Timing Guide

Vitamin C and AHA both lower skin pH. Here's how to layer them without over-exfoliation or reduced efficacy.

· 3 min read

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The short answer

Use AM/PM split: vitamin C in the morning, AHA in the evening 2-3x weekly. Same-time layering is safe but intensifies irritation. Never combine daily, both are exfoliating-adjacent and too much can damage the barrier.

Both are acidic actives. Layer them wrong and you’ll regret it.

Why the split matters

The short answer

Vitamin C at 15% L-ascorbic is pH 2.5-3.5. AHA at 5-10% is similarly acidic. Same-time layering doesn’t neutralize either, but doubles the acid exposure to skin, causing stinging and over-exfoliation. The AM/PM split gives the barrier recovery time.

The correct routine

Morning:

  1. Cleanse
  2. Vitamin C serum (acidic actives during day = photoprotection)
  3. Moisturizer
  4. SPF 30+

Evening (2-3x weekly):

  1. Cleanse
  2. AHA (glycolic or lactic)
  3. Moisturizer (no further actives)

Other evenings: Retinoid + moisturizer

Products for the stack

Maelove Glow Maker Vitamin C Serum
Premium
~$40

15% vitamin C with ferulic acid and vitamin E. The cult drugstore-price antioxidant serum.

Best for: Morning antioxidant

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The Ordinary Glycolic Acid 7% Toner
Best value

The Ordinary

Glycolic Acid 7% Toner

~$10

PM AHA slot, 2-3x weekly.

Best for: Evening exfoliation after AM vitamin C

"$10 glycolic that pairs with premium vitamin C."
Check price on Amazon →
Maelove Glow Maker Vitamin C
~$30

Budget CEF dupe for AM slot.

Best for: Full anti-aging stack without luxury price

"The honest dupe."
Check price on Amazon →

Frequently asked

Can sensitive skin do vitamin C + AHA? +

Start with AHA only 1x weekly. Add vitamin C AM after barrier adjusts.

Should I skip moisturizer between? +

No, moisturizer goes after BOTH vitamin C (AM) and AHA (PM).

Keep reading

All articles →

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