Korean: 포타슘하이드록사이드 · CAS 1310-58-3 · Functions: buffering
Restricted MFDS restricted ingredients
Conditions (official MFDS text, Korean):
* 배합한도 : ∙ 손톱표피 용해 목적일 경우 5%, pH 조정 목적으로 사용되고 최종 제품이 제5조제5항에 pH기준이 정하여 있지 아니한 경우에도 최종 제품의 pH는 11이하
∙ 제모제에서 pH조정 목적으로 사용되는 경우 최종 제품의 pH는 12.7이하
Source: MFDS — cosmetic ingredient use restrictions · checked Oct 16, 2026
Restricted Annex III/15a
Maximum: (a) 5% (b) 2% (General use) and 4.5% (Professional use) Entry 15d: 1,5%
Conditions: Product type: (a) Nail cuticle solvent (b) Hair straightener (c) pH adjuster for depilatories (d) Other uses as pH adjuster Callosity softener/remover (entry 15d) (b) 1. General use 2. Professional use (c) up to pH 12.7 (d) up to pH 11 15 d Contains alcakali, Avoid contact with eyes Keep out of reach of chindren ans Read directions for use carefully
Required label warning: (a) Contains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children (b) 1. Contains alkali Avoid contact with eyes Can cause blindness Keep out of reach of children 2. For professional use only Avoid contact with eyes Can cause blindness (c) Keep out of reach of children Avoid contact with eyes
Source: EU CosIng — Annex III · checked Oct 16, 2026
No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.
How Potassium Hydroxide 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): * 【제한】 적용 및 사용범위 : (a)손,발톱 보호용매 (b) 두발퍼머제 1. 일반용 2. 전문용 (c) 탈모제용 pH조절약 (d) 기타용도, pH조절약(목욕용 품에만 한함) * 【화장품 중 최대사용농도】 배합한도 (일반) : (a) 5%(중량으로 계산) (b) 1. 2%(중량으로 계산) 2. 4.5%(중량으로 계산) * 기타 제한조건 및 요구사항 : (c) pH≤12.7 (d) pH≤11 * 라벨에 반드시 표기해야하는 사용조건과 주의사항 : (a) 강한 염기성 함유 : 눈... |
| AS ASEAN (10 countries) | Restricted | MFDS summary (Korean): * 【Restrictions】 Field of application and/or use : (a) Nail cuticle solvent (b) Hair straightener 1. General use 2. Professional use (c) pH adjuster – for depilatories (d) Other uses as pH adjuster * 제한 【사용 범위】 : (a) 손톱 큐티클 용제 (b) 헤어 스트레이트너 (c) 제모제에서 pH 조절제 (d) 기타 사용에서 pH 조절제 15d-... |
| 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。 * 단서조항 : ※ 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。 ※... |
| BR Brazil | Restricted | MFDS summary (Korean): * Restrictions 【Field of application and/or use】 : (a) Removers cuticles (b) Hair strengthener: 1. General use 2. Professional use (c) To adjust pH depilatories d) For pH adjustments in other products * 제한 【사용 범위】 : (a) 큐티클 제거제에 (b) 헤어 스트레이트너에 1. 일반 사용에서 2. 전문가용에서 (c) 제모제에 pH 조정제에 (d) 기타... |
| AR Argentina | Restricted | MFDS summary (Korean): * Restrictions 【Field of application and/or use】 : (a) Removers cuticles (b) Hair strengthener: 1. General use 2. Professional use (c) To adjust pH depilatories d) For pH adjustments in other products * 제한 【사용 범위】 : (a) 큐티클 제거제에 (b) 헤어 스트레이트너에 1. 일반 사용에서 2. 전문가용에서 (c) 제모제에 pH 조정제에 (d) 기타... |
Source: MFDS cosmetic ingredient use restrictions — overseas regulations · checked Oct 16, 2026
POTASSIUM HYDROXIDE 포타슘하이드록사이드
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.
A strong alkali. In cleansers it reacts with fatty acids to make soap; in other products it adjusts pH.
In the EU's CosIng records it is listed as “Restricted” (EU CosIng — Annex III). The maximum allowed is (a) 5% · (b) 2% · 4.5% · 1,5%. 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: buffering.
Korea's MFDS standard Korean name is 포타슘하이드록사이드.
24+ products we checked list it, for example COSRX AC Collection Calming Foam Cleanser, Neogen A-Clear Aid Soothing Foam Cleanser (100ml), Peach & Lily Acne Oil-Free Moisturizer.
CAS 1310-58-3 (from official records).