Glycolic acid vs. salicylic acid: which should be your pick for radiant skin?
When it comes to exfoliating acids, it’s easy to feel as though you need a chemistry degree just to navigate the skincare aisle. AHAs, BHAs, PHAs… the acronyms alone can be enough to make your head spin. But if there’s one debate dermatologists and facialists are asked time and time again, it’s which ingredient is better: glycolic acid vs. salicylic acid.
While both are exfoliants, they work in very different ways. Salicylic acid has long been the go-to for tackling breakouts and congested pores, while glycolic acid is celebrated for its ability to brighten dull skin, smooth texture and soften the appearance of fine lines over time. So which one deserves a place in your routine? Ahead, experts explain the difference between glycolic acid vs. salicylic acid, which ingredient is best for different skin types and the formulas worth investing in.
What’s the difference between glycolic acid and salicylic acid?
If skincare ingredients had personalities, glycolic acid would be the overachieving perfectionist, while salicylic acid would be the cool-headed problem solver. Both are exfoliating acids, but they go about their business very differently.
“Glycolic acid is an alpha hydroxy acid (AHA), derived from sugar cane and loved for its tiny molecular size, which allows it to work effectively on the skin’s surface,” explains Mark Curry, co-founder and CEO of The Inkey List. So, think brighter tone, smoother texture and that coveted post-facial glow. It’s the ingredient that gently persuades dull, tired skin to move on.
The Ordinary Glycolic Acid 7% Exfoliating Toner
PIXI Glow Tonic
“Salicylic acid, on the other hand, belongs to the beta hydroxy acid (BHA) family,” says Curry. Unlike glycolic acid, salicylic acid can specifically target oil – meaning it can travel beyond the skin’s surface and into the pore itself. “There, it helps dissolve excess oil and debris before they have a chance to become blackheads or blemishes. It’s less about instant radiance and more about keeping the peace beneath the surface.”
CeraVe SA Smoothing Cleanser
medicube Zero Pore SA Clear Capsule Cleansing Foam
Which concerns can each individually target?
Glycolic acid is a complete multitasker and the ingredient to reach for if your complexion is looking a little lacklustre. “It helps improve uneven skin tone, soften the appearance of fine lines, fade post-breakout marks and smooth rough texture over time,” says Curry. It’s particularly good at bringing tired skin back into focus.
Paula’s Choice Skin Perfecting 25% AHA + 2% BHA Exfoliant Peel
Salicylic acid earns its reputation with oily, congested or acne-prone skin. “It helps unclog pores, reduce blackheads and whiteheads, calm active breakouts and regulate excess oil,” explains Curry. If your skin’s biggest complaint is congestion rather than dullness, it’s usually the more strategic choice.
Caudalie Vinopure Purifying Toner
Of course, skin rarely sticks to one issue at a time. It’s entirely possible to have both dullness and blemishes, which is why many routines eventually incorporate both ingredients, just not necessarily all at once – think bacne, chest bumps and keratosis pilaris.
Is one ingredient better than the other?
No, it’s more about matching up what you need. “If glow, pigmentation and texture are top of your wish list, glycolic acid is your pick. If you’re navigating breakouts, persistent congestion or excess oil, salicylic acid is difficult to beat,” Curry advises.
Are there any other ingredients to avoid or be mindful of when using glycolic or salicylic acid?
The biggest mistake isn’t usually using these acids, but using too many other potent actives alongside them. “Pairing glycolic or salicylic acid with high-strength retinoids, additional exfoliating acids or physical scrubs in the same routine can push skin from glowing to irritated surprisingly quickly and disrupt your barrier,” says Curry.
Vitamin C can also be worth thinking about. While there’s nothing inherently wrong with combining them, some skin types find the pairing a little too potent. To avoid any unnecessary irritation, it’s best to use your vitamin C products in the morning and exfoliating acids in the evening – if sensitivity is a concern.
Can you use glycolic acid with retinol?
“You can use glycolic acid with retinol; however, I would exercise caution with this if you have especially dry or sensitive skin,” advises Dr Alexis Granite, CeraVe consultant dermatologist. “Retinol accelerates skin turnover, so while not a true exfoliant, retinol does help shed some of the uppermost dead skin cell layer. This, combined with glycolic acid, has the potential to irritate the ingredients will penetrate more effectively”. Instead, it’s best to stick to lower concentration products and make sure you are tolerating one ingredient well first prior to starting the other. You can also alternate them, using glycolic acid one night and retinol the next to increase tolerability.
Whatever acid you choose, sunscreen is the non-negotiable finishing step. Exfoliation reveals fresher skin, but that new skin is more vulnerable to UV damage.
