Lactic acid and glycolic acid are both alpha hydroxy acids used in skincare to improve skin texture by exfoliating dead cells and promoting smoother skin. Glycolic acid works faster with deeper penetration due to its small molecules, while lactic acid offers gentler exfoliation with added hydration, making it better for sensitive skin.[1][2][3]
Both acids dissolve the bonds holding dead skin cells together, allowing the skin to shed its top layer naturally for a brighter, even texture.[2] Glycolic acid, derived from sugarcane, has the smallest molecule size among AHAs, so it sinks deep into the skin to speed up cell turnover, smooth rough patches, and refine uneven surfaces.[1][2] This makes it great for most skin types dealing with dullness or fine lines tied to texture issues.[1][2]
Lactic acid, sourced from milk, has larger molecules that stay more on the surface, providing mild exfoliation without much irritation.[2][3] It also pulls in moisture to hydrate while smoothing tone and texture, which helps dry or sensitive skin avoid redness or dryness.[1][3] For texture concerns like bumpy or rough areas, lactic acid builds results steadily over time.[3]
The strength of these acids depends on more than just percentage. A lower concentration of glycolic acid at a very low pH can feel stronger than a higher lactic acid at a buffered pH, so always check product details.[4] Using them together in pads or serums combines deep action from glycolic with lactic’s soothing hydration for better overall texture improvement.[1][2][5]
Start slow with either acid, like two to three times a week, to avoid overdoing it and causing irritation. They shine for acne-prone or oily skin too, as glycolic helps unclog pores while lactic keeps things balanced.[1]
Sources:
https://www.tataneu.com/pages/fashion/beauty-skincare/how-to-use-glycolic-and-lactic-acid-pads-for-radiant-skin
https://slmdskincare.com/blogs/learn/understanding-exfoliation-alpha-hydroxy-acids-ahas-vs-beta-hydroxy-acids-bhas
https://www.youtube.com/watch?v=yxl9l1Ey1Z8
https://www.alibaba.com/product-insights/glycolic-acid-toner-vs-lactic-acid-serum-is-alpha-hydroxy-strength-the-only-factor-that-matters.html
https://www.trulybeauty.com/es/blogs/body/how-to-get-even-skin-tone-on-body
