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Annex III Entry 2a 27/07/2020

THIOGLYCOLIC ACID

Thioglycolic acid and its salts

THIOGLYCOLIC ACID is listed in Annex III and may only be used under the conditions shown in this record. Maximum concentration in this record: (a) (i) 8% (ii) 11% (b) 5% (c) 2% (d) 11% The abovementioned percentages are calculated as thioglycollic acid.

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Restricted substance— Annex III, EU Regulation 1223/2009
Max conc.: (a) (i) 8% (ii) 11% (b) 5% (c) 2% (d) 11% The ab…
Entry: 2a

Record details

Maximum concentration

(a) (i) 8% (ii) 11% (b) 5% (c) 2% (d) 11% The abovementioned percentages are calculated as thioglycollic acid

Product type

Hair products Depilatories Hair rinse-off products Products intended for eyelash waving

Other restrictions

(a) (i) General use ready for use pH 7 to 9.5 (ii) Professional use ready for use pH 7 to 9.5

(b) ready for use pH 7 to 12.7

(c) ready for use pH 7 to 9.5

(d) ready for use pH 7 to 9,5

Warnings

Conditions of use:

(a) (b) (c) (d)
Avoid contact with eyes
Rinse eyes immediately if product comes into contact with them.

(a) (c) (d)
Wear suitable gloves

Warnings to be printed on the label:
(a)(i) (b) (c)
Contains thioglycolate
Follow the instructions
Keep out of reach of children

(a)(ii) (d)
For professional use only
Contains thioglycolate
Follow the instructions’

INCI glossary name

THIOGLYCOLIC ACID

Chemical name

Thioglycolic acid and its salts

Chemical / IUPAC name

Thioglycolic acid and its salts

Regulatory information

Regulation

(EU) 2015/1190

SCCS opinions

Identified ingredients

Key data

CAS
68-11-1
EC
200-677-4
Annex
III
Entry number
2a

Inventory links for THIOGLYCOLIC ACID

Direct matches are limited for this record, so nearby entries from Annex III are shown as well.

Annex III 21
Shared product type

QUININE

CAS: 130-95-0
EC: 205-003-2
Annex III 3
Shared product type

OXALIC ACID

CAS: 144-62-7
EC: 205-634-3
Annex III 4
Nearby record in the same annex

AMMONIA

CAS: 7664-41-7 / 1336-21-6
EC: 231-635-3 / 215-647-6
Annex III 5
Nearby record in the same annex

Chloramine-T

CAS: 127-65-1
EC: 204-854-7

What Annex III means for THIOGLYCOLIC ACID

THIOGLYCOLIC ACID is a restricted substance under Annex III of EU Cosmetics Regulation 1223/2009. Its use in cosmetics is only permitted under the specific conditions set out in the entry above, including applicable concentration limits, product type restrictions and required warning statements.

When including this substance in a formulation, all conditions — maximum concentration, product scope and warning labels — must be met simultaneously. Compliance with one condition does not override the others.

This record is linked to 9 CosIng inventory ingredients for name and identifier cross-reference. The page also surfaces 11 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Ensure formulation concentration does not exceed: (a) (i) 8% (ii) 11% (b) 5% (c) 2% (d) 11% The abovementioned percentages are calculated as thioglycollic acid
  • Confirm product type compatibility: (a) Hair products (b) Depilatories (c) Hair rinse-off products (d) Products intended for eyelash waving
  • Include required warning statement on product label.
  • Document conditions of use in the Product Information File (PIF).

Frequently asked questions

THIOGLYCOLIC ACID is listed in Annex III of EU Regulation 1223/2009 as a restricted substance. It may only be used under the conditions specified in the entry, including any maximum concentration, product type limitation and required warning statements shown above.

CAS 68-11-1 is the unique numerical identifier assigned to THIOGLYCOLIC ACID by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

The maximum concentration of (a) (i) 8% (ii) 11% (b) 5% (c) 2% (d) 11% The abovementioned percentages are calculated as thioglycollic acid applies to the concentration of the substance in the ready-to-use cosmetic product. When the substance is supplied as part of a blend or mixture, the calculation must account for the contribution of all sources in the formulation. The combined concentration must not exceed the stated limit.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex III record THIOGLYCOLIC ACID

This page summarizes one Annex III record for THIOGLYCOLIC ACID from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex III conditions for THIOGLYCOLIC ACID, but confirm any final regulatory decision against the current official annex wording and source files.

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