Glycolic acid, long a skincare favorite, now shines in hair care by exfoliating the scalp and smoothing strands. This article explores its benefits, usage, and products based on expert insights and trends.
Core Benefits
Glycolic acid acts as a gentle exfoliant on the scalp, dissolving dead skin cells and product buildup to create a cleaner environment for hair growth.
It penetrates the hair shaft to boost moisture retention, reducing frizz and leaving strands softer with a glossy finish.
For oily scalps or dandruff-prone skin, it balances sebum production and eases flakes without harsh scrubbing.
How It Works
As the smallest AHA molecule, glycolic acid slips easily into the scalp’s surface and hair cuticles, promoting cell turnover and strengthening bonds.
This dual action—exfoliation plus hydration—improves overall texture, making hair more manageable and resilient against breakage.
Over time, it enhances product absorption, so conditioners and oils perform better on prepped hair.
Ideal Hair Types
Dry, frizzy locks respond well, gaining smoothness and shine from the humectant properties.
Those with buildup, itchiness, or oiliness see the most scalp relief, though color-treated hair benefits from cautious use to avoid fading.
Curly or textured hair types often report less tangling and better definition after regular treatments.
Usage Guidelines
Start with products formulated for hair, applying to dry or damp scalp 1-2 times weekly to build tolerance.
Massage in gently, leave for 5-10 minutes (or as directed), then rinse thoroughly before shampooing.
Patch test first, and pair with moisturizing follow-ups; avoid mixing with strong actives like retinol in the same session.
Product Recommendations
| Product | Key Features | Best For |
| L’Oréal Paris EverPure Glycolic Gloss Mask | 17% glycolic complex; 5-min treatment for shine | Frizz control, all hair types |
| The INKEY List Glycolic Acid Scalp Scrub | Chemical + physical exfoliants; weekly pre-shampoo | Buildup, dandruff |
| Amika Smooth Over Treatment | Gloss-focused formula; salon-like slip | Dry, damaged strands |
Precautions
Sensitive scalps may experience tingling—dilute or reduce frequency if irritation arises.
Not ideal for very damaged or freshly colored hair without professional advice, as it can temporarily alter structure.
Sun protection remains key post-use, even on scalp, to prevent sensitivity.
