What is Glycolic Acid?
Glycolic acid is the smallest member of the alpha hydroxy acid (AHA) family, derived commercially from sugarcane. Because of its tiny molecular size, glycolic acid penetrates the stratum corneum more easily than any other AHA, which makes it both the most effective and the most irritating exfoliant in the category. It works by loosening the bonds between dead skin cells, allowing them to shed more evenly and revealing fresher, brighter skin underneath.
Clinical evidence for glycolic acid is extensive. Regular use at 5–10% improves skin texture, fine lines, tone evenness, acne, and hyperpigmentation. At professional concentrations (20–70%), glycolic acid peels are a standard dermatology office treatment for acne scarring and photoaging.
Why does Glycolic Acid cause irritation?
The same molecular smallness that makes glycolic acid effective is what makes it irritating. It penetrates quickly and deeply, which can overwhelm the skin barrier if used too often, at too high a concentration, or on compromised skin. Common reactions include stinging on application, mild to moderate peeling, redness, and a tight, dry feeling.
Two issues are particularly important for melanin-rich Indian skin:
Post-inflammatory hyperpigmentation (PIH) — If glycolic acid irritates your skin, the inflammation can trigger pigmentation cells to produce extra melanin, leaving dark marks that take months to fade. Users with brown skin should start at 5%, not 10%, and watch for any redness that lingers.
Sun sensitivity — Glycolic acid makes skin significantly more vulnerable to UV damage. Daily SPF 50 is non-negotiable, and outdoor activities should be timed carefully.
The Cosmetic Ingredient Review rates glycolic acid safe at concentrations up to 10% for home use and higher for professional peels. Contact dermatitis is less common than irritation.
In Indian products 🇮🇳
Glycolic acid exploded in Indian skincare around 2020. The Ordinary Glycolic Acid 7% Toning Solution (the best-selling glycolic toner worldwide, widely available in India) is the most popular entry point. Indian D2C brands followed: Minimalist 10% Glycolic Acid, The Derma Co 10% Glycolic Acid, Plum 10% Glycolic Acid, Dot & Key 8% Glycolic + PHA, Foxtale Glycolic, Mamaearth Glycolic Acid, and Re'equil Glycolic Acid all sit between ₹400 and ₹900.
Indian-context notes:
- High UV index + glycolic acid = pigmentation risk — India's strong sun makes daily SPF 50 absolutely essential when using glycolic acid. Skipping sunscreen creates exactly the dark spots you're trying to fade.
- Melanin-rich skin and PIH — Indian users should start at 5–7%, not 10%, to minimize inflammation risk. Build tolerance over 4–6 weeks.
- Alternating with retinol — many Indian users combine glycolic acid and retinol. Do not use both on the same night. Alternate.
- Body use for KP and rough skin — glycolic acid body lotions are excellent for keratosis pilaris, rough elbows, and strawberry legs common in Indian women.
- Professional peels — Indian dermatology clinics offer 20–50% glycolic peels for ₹1500–3500 per session, often as part of pigmentation or acne scar treatment.
How to use Glycolic Acid well
- Start at 5–7%, not 10% — Especially for Indian skin. Build up only if 7% is comfortable for 4 weeks.
- Use 2–3 times per week, not daily — Unless your skin is very tolerant, more frequent use risks barrier damage.
- Apply at night — Glycolic acid's photosensitivity and your skin's repair mode both make evening use best.
- Daily SPF 50 — Absolutely non-negotiable.
- Don't combine with retinol on the same night — Alternate on different evenings.
Safer alternatives
- For sensitive skin: Lactic acid is larger, gentler, and also hydrating. A good entry-level AHA.
- For very sensitive skin: Mandelic acid is the largest AHA, very slow-penetrating, and well-tolerated.
- For low irritation with exfoliation: Polyhydroxy acids (PHA) like gluconolactone are the newest and gentlest acid family.
- For oily/acne skin: Salicylic acid (BHA) is oil-soluble and penetrates into pores rather than just the surface.