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The ingredient, explained

Hydrochloric Acid

Research examined HYDROCHLORIC ACID under the stated study conditions.

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Ingredient guide

What it is and what it does

Hydrogen chloride

About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗

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Helps resist changes in a formula's pH.

Function definitions: European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗

Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.

A closer look

What the research shows

Human exposure research

Atopic and nonatopic panels showed similar irritant responses to 10% hydrochloric acid in the specified patch test.

What this does not tell us

30 atopic and 28 nonatopic subjects, 4-hour concentrated irritant exposure. This does not quantify risk from pH-adjusted cosmetic formulas or establish skin benefit.

Sources for this summary. PubMed 8896952 ↗

Research review checked Oct 1, 2026

Review supplied candidate titles and available abstracts selectively for exact identity; targeted primary PubMed/publisher searches. This is not an exhaustive systematic review.

Ingredient research is not proof that a product containing this ingredient works.

Read the 1 selected study

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Products containing this ingredient

All 1 products ↗

From the wider catalogue. Linked by the ingredient list, without an efficacy ranking.

Names and identifiers

Registry identity

Hydrogen chloride

INCI name on ingredient lists
HYDROCHLORIC ACID
CAS registry number
7647-01-0
EC number
231-595-7
Other recorded names (1)
  • acidum hydrochloricum

Sources for this ingredient record