Can you use Lactic Acid with Sunscreen?
Yes. Sunscreen is the essential daytime partner for Lactic Acid.
Why
Sunscreen does not interfere with Lactic Acid. Many actives (especially retinoids, exfoliating acids and brightening ingredients) leave skin more vulnerable to UV damage, and daily broad-spectrum SPF protects the results you are working toward.
How to use them together
- Apply Lactic Acid as directed (if it is a night-time active, use it in the PM).
- In the morning, finish your routine with a broad-spectrum SPF 30 or higher as the last skincare step.
- Reapply every two hours when outdoors.
Who should be careful
Anyone using retinoids or acids should treat daily sunscreen as non-negotiable. If a sunscreen stings over freshly applied actives, wait a few minutes or switch to a mineral formula.
About the ingredients
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.
Sunscreen: Broad-spectrum SPF 30+ protects against UV damage. It is the essential partner for retinoids, acids and brightening ingredients.
FAQ
Can I use Lactic Acid and Sunscreen together?
Yes. Sunscreen is the essential daytime partner for Lactic Acid.
Should I use Lactic Acid or Sunscreen in the morning or at night?
Apply Lactic Acid as directed (if it is a night-time active, use it in the PM). In the morning, finish your routine with a broad-spectrum SPF 30 or higher as the last skincare step.
Who should be careful combining Lactic Acid and Sunscreen?
Anyone using retinoids or acids should treat daily sunscreen as non-negotiable. If a sunscreen stings over freshly applied actives, wait a few minutes or switch to a mineral formula.
Do I need sunscreen with Lactic Acid and Sunscreen?
Yes. Daily broad-spectrum SPF 30+ is recommended with any active skincare routine.
Sources
Studies and reviews on these ingredients and, where available, on this specific combination.
- Kornhauser A, Coelho SG, Hearing VJ. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clin Cosmet Investig Dermatol. 2010;3:135-142.
- Sunscreens part 1: Mechanisms and efficacy. J Am Acad Dermatol. 2025.
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- Can you use Vitamin C with Sunscreen?
- Can you use Niacinamide with Sunscreen?
- Can you use Tretinoin with Sunscreen?
- Can you use Salicylic Acid with Sunscreen?
- Can you use Hyaluronic Acid with Sunscreen?
- Can you use Retinol with Lactic Acid?
- Can you use Vitamin C with Lactic Acid?