Lysine HCl
AKA “L-Lysine hydrochloride, L-Lysine monohydrochloride, lysine hydrochloride, L-Lysine, monohydrochloride, L-(+)-Lysine Monohydrochloride, Lysine hcl, Lysine
Synthetic
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Ingredient Facts
Lysine hcl
AKA: L-Lysine hydrochloride, L-Lysine monohydrochloride, Lysine hydrochloride, L-Lysine, Monohydrochloride, L-(+)-Lysine Monohydrochloride
Synthetic · Hair Conditioning | Skin Conditioning · EWG: 4
Plant-Derived
Skin Conditioner
Hair Care
Amino Acid
Synthetic
Clean
An amino acid that strengthens and moisturizes hair and skin, helping to improve texture and resilience for a smoother, healthier appearance.
Formula
C6H15ClN2O2
Mol. Weight
182.65
CAS #
657-27-2, 10098-89-2, 22834-80-6
Form
Powder
Plant-Derived
Synthetic. Lysine HCl is synthesized from L-lysine, a naturally occurring amino acid produced through bacterial fermentation. The free base lysine is then converted to its hydrochloride salt form through acid treatment.
Function
Hair Conditioning | Skin Conditioning
Benefits
Locks in moisture
Traditional Use
L-lysine was identified as an essential amino acid in the early 20th century. Its use in skincare is a modern application developed to support collagen formation and skin barrier function.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe, Not Phototoxic
Concentration Guide
Industry Max
Industry typically uses up to 0.7% in leave-on products (28 products reported). Source: CIR Safety Assessment (CIR Seq 607).
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR