KBeauty Verified™
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KBeauty Verified™ — K-beauty checked against official records from Korea, the EU and the U.S.
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Named by what the crawler says it is; look-alikes we detect are counted under Others. Google · Gemini includes Googlebot, Google’s search crawler, whose index Google also uses for its AI features; other search engines and bots are in Others. AI visibility →

Leucine

Korean: 류신 · CAS 328-39-2(DL-) ,61-90-5(L-) · Functions: antistatic, hair conditioning, skin conditioning

KR South Korea (MFDS)

No specific rule on file.

EU European Union (CosIng)

No specific rule on file.

US United States (FDA)

No specific rule on file. The FDA regulates few cosmetic ingredients by name; no rule does not mean approval.

Our noteAn amino acid used as a skin conditioner.

Products listing Leucine

Round Lab 1025 Dokdo Water Gel Mask Sheet Mask · $3.20
0 1 0 0 0 0 0 1
Peach & Lily Advanced Rebound Bioglow Zombie Cream™ Moisturizer · $59.00
0 1 0 0 0 0 0 1
Amos Professional AMOS True Repair Essence 100ml Essence
0 1 0 0 0 0 0 1
Amos Professional AMOS True Repair Night Cream 180 ml Moisturizer
0 0 0 0 0 0 0 0
Amos Professional AMOS True Repair Shampoo 500 g Other
0 1 0 0 0 0 0 1
Amos Professional AMOS True Repair Treatment 200ml Other
0 0 0 0 0 0 0 0
Missha Atelo Collagen 500 Power Plumping Cream Moisturizer · $25.90
0 0 0 0 0 0 0 0
Aestura ATOBARRIER 365 HYDRO ESSENCE Essence
0 1 0 0 0 0 0 1
Medicube Azelaic Acid Niacinamide Clarifying Toner Toner · $21.00
0 2 1 0 0 0 0 4
ma:nyo Bifida Biome Ampoule Mask - 10 Pack Mask · $30.00
0 2 2 0 0 0 0 5
Longtake Black tea & fig softening treatment 200ML Other
0 2 1 0 0 0 0 4
Dear, Klairs Blue EGF Intensive Pro Cream Moisturizer
0 0 0 0 0 0 0 0
Kundal Caffeine Scalp Care Water Treatment 10.14 fl. oz. - Herb Mint Other · $27.29
0 0 0 0 0 0 0 0
Pyunkang Yul Calming Moisture Nourishing Cream 50ml Moisturizer · $15.99
0 1 0 0 0 0 0 1
Torriden CELLMAZING Collagen Cream Moisturizer · $28.00
0 2 2 0 0 0 0 5
Torriden CELLMAZING Firming Gel Mask (Face Only) Mask · $23.00
0 2 1 0 0 0 0 4
Holika Holika Cera Barrier Moisture Active Cream in Serum 50ml / 1.69 fl. oz. (MC) Serum · $16.99
0 0 0 0 0 0 0 0
TIRTIR Ceramic Milk Ampoule Serum · $13.00
0 2 2 0 0 0 0 5
Rovectin Cica Care Balancing Toner Toner
0 2 0 0 0 0 0 2
Mixsoon Collagen Hydrogel Eye Patch Mask · $19.60
0 2 2 0 0 0 0 5
Mixsoon Collagen Hydrogel Eye Patch Single Pack Mask · $15.00
0 2 2 0 0 0 0 5
Lagom Collagen Lifting Neck Cream 1.69 Fl Oz Moisturizer · $30.00
0 1 0 0 0 0 0 1
Abib Deep clean foam cleanser Sedum hyaluron foam 150ml Cleanser · $15.71
0 0 0 0 0 0 0 3
Medicube Deep Reviving Peptide Eye Cream Eye
0 2 2 0 0 0 0 4

Also listed as

Leucine 류신

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.

Frequently asked questions

What is Leucine?

An amino acid used as a skin conditioner.

Is Leucine banned in the European Union?

We found no specific rule for it in the EU's CosIng records. That is not an approval or a safety statement.

Is Leucine banned in South Korea?

We found no specific rule for it in Korea's MFDS records. That is not an approval or a safety statement.

Is Leucine allowed in cosmetics in the U.S.?

We found no specific rule for it in the FDA's records. That is not an approval or a safety statement.

What is Leucine used for in cosmetics?

The EU's CosIng inventory lists its functions as: antistatic, hair conditioning, skin conditioning.

What is Leucine called on Korean labels?

Korea's MFDS standard Korean name is 류신.

Which K-beauty products contain Leucine?

24+ products we checked list it, for example Round Lab 1025 Dokdo Water Gel Mask Sheet, Peach & Lily Advanced Rebound Bioglow Zombie Cream™, Amos Professional AMOS True Repair Essence 100ml.

What is the CAS number of Leucine?

CAS 328-39-2(DL-) ,61-90-5(L-) (from official records).

Ask KBeauty Verified™
KBeauty Verified™ — K-beauty checked against official records from Korea, the EU and the U.S.
Reading time:
Views: 0
ChatGPT: 2 Claude: 1 Google · Gemini: 0 Perplexity: 0 Meta AI: 0 Amazon: 0 Others: 0
Read by AI & crawlers
ChatGPT2
Claude1
Google · Gemini0
Perplexity0
Meta AI0
Amazon0
Others0

Named by what the crawler says it is; look-alikes we detect are counted under Others. Google · Gemini includes Googlebot, Google’s search crawler, whose index Google also uses for its AI features; other search engines and bots are in Others. AI visibility →