Glow Definition
Lactic acid is a type of AHA (alpha hydroxy acid) often derived from fermented sugars or milk — though today’s formulations are typically vegan and lab-made. In skincare, it functions as a gentle chemical exfoliant, helping to dissolve dead skin cells on the surface of the skin for a smoother, more even-toned appearance.
Unlike some stronger AHAs, lactic acid has a larger molecular structure, which means it doesn’t penetrate as deeply — making it a go-to option for sensitive skin types. But what truly sets lactic acid in skincare apart is its unique ability to support hydration, while it exfoliates. It acts as a humectant, helping the skin attract and retain moisture — making it one of the few ingredients that enhances both texture and moisture balance in a single step.
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Why It Matters
Lactic acid in skincare is known as one of the most beginner-friendly exfoliants available — but don’t mistake gentle for ineffective. Its ability to help smooth uneven texture, brighten dull skin, and boost glow makes it a core ingredient in everything from weekly peels to daily toners. Unlike other acids that can leave skin feeling tight or dry, lactic acid works double-duty; it refines your skin’s surface and helps replenish moisture at the same time.
Because it’s naturally hydrating and mildly exfoliating, lactic acid is often the first AHA introduced in barrier-friendly routines, especially for those who are glow-curious but sensitive-prone.
GLOW TIP Layer lactic acid with humectants like glycerin or hyaluronic acid to amplify both exfoliation and hydration without compromising your barrier.
Why We Love It For Glow
Lactic acid walks the line between exfoliation and hydration — and that’s exactly what makes it a standout in glow-focused routines. Unlike stronger acids that prioritize intensity, lactic acid is surface-level by design, gently softening buildup that can dull radiance without disrupting your skin barrier.
It’s also one of the few exfoliants that naturally attracts moisture, helping your skin look more refined and more replenished. We love it for moments when skin feels uneven, dehydrated, or just not quite luminous — because it helps everything else in your routine absorb better and show up more.
Reach for Sunday Riley Good Genes All-in-One Lactic Acid Treatment — a silky, serum-style exfoliant that gently smooths without stripping.
Despite the name, this doesn’t try to do everything at once — and that’s why it works. The texture feels plush, not harsh, and it’s ideal for nights when your skin needs refining without a reset. Especially well-suited for hydration layering routines and dull-skin days.
FAQ
Is lactic acid okay for sensitive skin?
It depends on the formula and concentration. Lactic acid is often considered one of the gentler AHAs, but always patch test and introduce it slowly — especially if your skin is reactive.
Can I use lactic acid every day?
Some products are designed for daily use, while others are better as a once-or-twice-a-week step. Follow product’s instructions and pay attention to how your skin responds.
Does lactic acid help with hydration?
Yes — lactic acid is unique among exfoliants because it’s a humectant, meaning it can help attract moisture to the skin while it works. That’s part of what makes it glow-friendly.