Glow Definition
Glycolic acid is a well-known type of AHA (alpha hydroxy acid) and a widely used chemical exfoliant in skincare, valued for its ability to exfoliate the skin’s surface. Derived from sugarcane, it has the smallest molecular size of all AHAs — which means it penetrates more deeply than lactic or mandelic acid, making it one of the most effective ingredients for targeting visible dullness and uneven texture.
Because of this potency, glycolic acid is often featured in exfoliating toners, masks, and peels — usually as a once-or-twice-a-week reset step. While it’s powerful, it can be drying or sensitizing if layered too frequently, which is why it’s often paired with barrier-supportive ingredients in balanced glow routines.
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Why It Matters
Glycolic acid in skincare plays a foundational role in how we approach visible texture, tone, and brightness. As the most potent AHA used in everyday products, its small molecular size allows it to work deeper than most surface-level exfoliants — making it a key player in refining pores, softening fine lines, and revealing a smoother canvas underneath.
Unlike physical scrubs or harsher actives, glycolic acid offers a more controlled resurfacing effect when properly formulated, helping skin look refreshed without aggressive peeling. It’s a cornerstone for building a glow-supportive exfoliation routine — especially when balanced with hydration and barrier care.
GLOW TIP Pair glycolic acid with barrier-supportive ingredients like ceramides or glycerin to maintain glow without compromising skin comfort.
Why We Love It For Glow
Using glycolic acid in skincare is one of the most time-tested ways to bring dull, uneven skin back to life — fast. Its ultra-small molecule size allows it to gently resurface the top layer of skin, promoting a brighter, more even-looking complexion overtime.
When used correctly, glycolic acid a glow-resetting staple that fits into everything from nightly exfoliating toners to rinse-off masks.
Reach for REN Ready Steady Glow Daily AHA Tonic — a fan-favorite blend of glycolic acid, lactic acid, and willow bark that’s made to fit into your nightly glow ritual.
This vegan formula feels elevated but accessible — and the oversized bottle makes it one of the more generous picks at this price point. Expect a smooth, well-behaved exfoliation step that plays well with hydrating serums and creamy moisturizers.
FAQ
How often should I use glycolic acid in my skincare routine for best results?
Glycolic acid is one of the strongest AHAs. To avoid over-exfoliation, most routines benefit from using glycolic acid 2-3 times per week. It’s best applied at night after cleansing and before moisturizing. Overuse can lead to sensitivity, so adjust frequency based on how your skin responds.
What’s the difference between glycolic acid and other exfoliating acids like lactic or salycilic?
Glycolic acid has the smallest molecular size of all AHAs, allowing it to penetrate deeper than lactic acid and work more aggressively on dullness and texture. Unlike salicylic acid, which is a BHA that targets oil and pores, glycolic acid focuses on surface renewal and overall glow refinement.
Can I use glycolic acid with retinol or vitamin C in the same routine?
It’s generally recommended to avoid combining glycolic acid with potent actives like retinol or vitamin C in the same routine, as this may increase the risk of irritation. Instead, alternate days or use glycolic acid in your evening routine and vitamin C in the morning.
Is glycolic acid safe for sensitive skin?
If you’re new to exfoliants or have sensitive skin, start with a lower concentration (under 5%) and use only once a week. Look for glycolic acid products buffered with calming ingredients or paired with barrier-supportive hydrators.