Hydrochloric Acid
Hydrochloric acid is a strong mineral acid used in cosmetics to adjust the pH of a product. It helps ensure the product's acidity or alkalinity is within a stable and safe range for skin application. Its primary role is formulation stability and efficacy, not direct skin benefit.
NonePH adjusterVeganEvidence: High
RiskModerate 1.8 / 4
Irritation i1.5 / 4
Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.
Sensitization i0.5 / 4
Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.
Rated by SpottyLabs' ingredient methodology, independent of brands.
Things to watch
- Can be highly corrosive in concentrated forms
- May cause severe irritation or burns if not properly diluted
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Frequently asked questions
- Why is hydrochloric acid in my skincare product?
- Hydrochloric acid is used in very small, controlled amounts to adjust the pH of a cosmetic product. This ensures the product remains stable, effective, and safe for skin contact.
- Is hydrochloric acid safe for skin?
- When used in cosmetic formulations, hydrochloric acid is present in extremely low concentrations and is neutralized to achieve the desired pH. In its diluted form within a finished product, it is generally considered safe.
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