Salicylic Acid

Salicylic Acid is a beta hydroxy acid (BHA) derived from willow bark that is oil-soluble, allowing it to penetrate into pores and dissolve sebum buildup. It is a proven exfoliant for the scalp and is the active ingredient in many medicated dandruff shampoos. Its ability to dissolve the glue holding dead skin cells together makes it excellent for treating flaky, buildup-prone scalps.

Source: Willow bark (natural) or synthesized from phenol

Origin: Semi-synthetic

Also known as: BHA, Beta Hydroxy Acid, 2-Hydroxybenzoic Acid

Salicylic Acid dissolves the intercellular lipid bonds that hold dead skin cells together on the scalp surface, promoting gentle exfoliation. It penetrates into hair follicles and pores to dissolve excess sebum and product buildup. It also has anti-inflammatory and mild antimicrobial properties that help reduce scalp irritation and dandruff symptoms.

Best For

Dandruff-prone scalp, product buildup, oily scalp, scalp psoriasis, seborrheic dermatitis

Not Recommended For

Very dry scalp, sensitive skin with compromised barrier, open scalp wounds

Concentration Matters

0.5-3%

Safe at OTC concentrations (1-3% for scalp products). Can cause dryness and irritation if overused. Not recommended during pregnancy (though topical scalp use is generally considered low risk). May increase sun sensitivity. Should not be used with other strong exfoliants simultaneously.

FDA Status: Approved

FDA-approved as an OTC active ingredient for dandruff and seborrheic dermatitis treatment at 1.8-3% concentration. Also approved for acne and wart removal at different concentrations.

EWG Score: 3/10

Anti-dandruff shampoos, scalp scrubs, clarifying treatments, scalp serums

If you want to avoid Salicylic Acid, look for products with these ingredients instead:

Zinc Pyrithione, Ketoconazole, Glycolic Acid, Tea Tree Oil