Glycolic vs Lactic Acid - Which AHA Is Best for Your Skin Type?

Understanding AHAs - The Exfoliating Heroes

Alpha Hydroxy Acids, or AHAs, are skincare’s secret weapons for smoother, brighter, and more even skin. They work by gently dissolving the “glue” that holds dead cells together, revealing fresh new skin underneath. Two of the most popular AHAs are Glycolic Acid and Lactic Acid - but which one is best for your skin type?

Meet the Acids

Glycolic Acid is the smallest AHA molecule, allowing it to penetrate deeply into the skin. This makes it ideal for addressing fine lines, dullness, and uneven texture. It’s a powerful exfoliant found in the Skin Republic Glycolic Acid 10 % Serum and Glycolic + Lactic Acid 30 % Serum.

Lactic Acid, on the other hand, has a larger molecular structure. It works more slowly, making it gentler and more hydrating. Lactic Acid is a favourite for dry or sensitive skin types and features in Skin Republic’s AHA 15 % Serum.

How They Work

• Glycolic Acid: Breaks down the outermost dead cells, boosting cell turnover and collagen production. Expect smoother skin and a reduction in visible pigmentation and fine lines.
• Lactic Acid: Gently exfoliates while improving hydration by stimulating natural ceramide production. It refines texture without stripping moisture.

Which One Is Right for You?

Choosing between glycolic and lactic acid depends on your skin’s tolerance and goals:

• Choose Glycolic Acid if: You have oily or combination skin, visible pores, or pigmentation. It delivers faster, more dramatic resurfacing results.
• Choose Lactic Acid if: Your skin is dry, sensitive, or prone to irritation. It offers gentle renewal and long-term hydration.
• Use Both: Some users alternate - glycolic one night, lactic the next - for comprehensive renewal without over-exfoliation.

How to Use AHAs Safely

1. Start Slow: Introduce 2–3 nights per week and increase as your skin adapts.
2. Apply on Clean, Dry Skin: Wait a few minutes before layering other serums or creams.
3. Always Follow with SPF: AHAs increase sun sensitivity. Use the SPF 50 + Niacinamide Stick every morning to protect your new skin.

Expert Tip

Combine exfoliating serums with calming, hydrating products like the Niacinamide 10 % Overnight Mask. It soothes freshly exfoliated skin while enhancing glow.

Results You Can Expect

• Glycolic Acid: Brighter, smoother skin within one week; visible reduction in pigmentation and fine lines over four weeks.
• Lactic Acid: Improved hydration and refined texture within days; more supple, balanced skin over time.

Both acids are powerful yet complementary. Glycolic is your go-to for rapid resurfacing, while Lactic is ideal for gentle, lasting renewal. Whichever you choose, these Skin Republic formulas ensure effective, dermatologist-tested results suitable for South African skin and climate.

Shop your ideal exfoliant today and glow with confidence.