Korean: 포타슘설파이트 · CAS 10117-38-1 ,23873-77-0 · Functions: antioxidant, hair waving or straightening, preservative, reducing
Restricted MFDS restricted ingredients
Conditions (official MFDS text, Korean):
* 배합한도 : <보존제>
∙ 유리 SO2로 0.2%
<기타배합한도>
∙ 산화염모제에서 유리 SO2로 0.67%
∙ 기타 제품에는 사용금지
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 17, 2026
Restricted Annex III/99
Maximum: (a) 0.67% (as free SO2) (b) 6.7% (as free SO2) (c) 0.45% (as free SO2) (d) 0.40% (as free SO2)
Conditions: Product type: (a) Oxidative hair dye products (b) Hair straightening products (c) Self-tanning products for the face (d) Other self-tanning products For purposes other than inhibiting the development of micro-organisms in the product. This purpose has to be apparent from the presentation of the product
Source: EU CosIng — Annex III · checked Oct 17, 2026
Approved preservative Annex V/9
Maximum: 0.2% (as free SO2)
Conditions: Inorganic sulphites and hydrogensulphites (5)
Source: EU CosIng — Annex V · checked Oct 17, 2026
No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.
How Potassium Sulfite is treated in 5 more markets, from the overseas cosmetic regulation database compiled by Korea's MFDS. Always confirm with the regulator of that country before selling there.
| Market | Status | Conditions |
|---|---|---|
| CN China | Restricted | MFDS summary (Korean): <사용제한성분> * 【제한】 적용 및 사용범위 : (a) 산화성 염색제 (b) 퍼머제품(스트레이트 제품 포함) (c) 얼굴부위위 자동 썬텐제품 (d) 신체부위의 자동 썬텐제품 (e) 기타제품 * 【화장품 중 최대사용농도】 배합한도 (일반) : (a)총량 0.67%（유리 SO2로 계산) (b)총량 6.7%（유리 SO2로 계산) (c)총량 0.45%（유리 SO2로 계산） (d)총량 0.40%（유리 SO2로 계산） (e)총량 0.2%（유리SO2로 계산) <사용제한 방부제> * 【화장품 중 최대사용농도】 배합한도 (일반) :... |
| AS ASEAN (10 countries) | Restricted | MFDS summary (Korean): (9) As a preservative, see Annexe VI, Part 1, No 9 * 단서조항(주석) : (9) As a preservative, see Annexe VI, Part 1, No 9 (9) 보존제로서, Annexe VI, Part 1, No 9을 참고하십시오. * 【Restrictions】 Field of application and/or use : (a) Oxidative hair dye products (b) Hair straightening products (c) Self- tanning... |
| TW Taiwan | Restricted | MFDS summary (Korean): ※ 染髮、脫色、脫染及燙髮產品之應刊載之注意事項，應依衛生福利部公告刊載之。 ※ 染髮產品之限量標準：係指該成分依產品使用說明書混合後之最高允許使用量。 ※ 化粧品之外包裝或容器，應明顯標示本表所列成分之注意事項。因外包裝或容器表面積過小或其他特殊情形致不能標示者，應於標籤、仿單或以其他方式刊載之。 ※ 本表所稱之口腔製劑，包含非藥用牙膏、漱口水類及美白牙齒類等化粧品。 ※ 化粧品宣稱效能者，須符合化粧品標示宣傳廣告涉及虛偽誇大或醫療效能認定準則規定。... |
| BR Brazil | Restricted | MFDS summary (Korean): * Restrictions 【Field of application and/or use】 : (a) an oxidizer in hair dyes (b) straighteners hair products (c) facial sunless d) Other self-tanning * 제한 【사용 범위】 : (a) 산화형 염모제 (b) 헤어 스트레이트닝 제품 (c) 얼굴 자외선 차단 (d) 기타 셀프 태닝 제품 * Restrictions 【Maximum concentration permitted at final... |
| AR Argentina | Restricted | MFDS summary (Korean): * Restrictions 【Field of application and/or use】 : (a) an oxidizer in hair dyes (b) straighteners hair products (c) facial sunless d) Other self-tanning * 제한 【사용 범위】 : (a) 산화형 염모제 (b) 헤어 스트레이트닝 제품 (c) 얼굴 자외선 차단 (d) 기타 셀프 태닝 제품 * Restrictions 【Maximum concentration permitted at final... |
Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 17, 2026
POTASSIUM SULFITE 포타슘설파이트
Information only, not medical advice. Rules change — always check the linked official source. If you are pregnant, have a skin condition or allergies, ask a dermatologist or pharmacist.
In the EU's CosIng records it is listed as “Restricted” (EU CosIng — Annex III). The maximum allowed is (a) 0.67% · (b) 6.7% · (c) 0.45% · (d) 0.40%. The same records also list it as: Approved preservative. A restricted ingredient is allowed within the stated conditions.
In Korea's MFDS records it is listed as “Restricted” (MFDS — cosmetic ingredient use restrictions). A restricted ingredient is allowed within the stated conditions.
We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.
The EU's CosIng inventory lists its functions as: antioxidant, hair waving or straightening, preservative, reducing.
Korea's MFDS standard Korean name is 포타슘설파이트.
CAS 10117-38-1 ,23873-77-0 (from official records).