Amino Acids
Also known as: Amino acid complex, Hydrolyzed proteins, Free amino acids, Glycine, Leucine, Lysine, etc. (individual amino acids)
Building blocks of proteins that hydrate, strengthen skin barrier, and support collagen structure.
See this ingredient in your own products — scan the label.
Get the appWhat it does
Amino acids function as humectants, drawing moisture into the skin while also supporting the natural moisturizing factor (NMF). They help reinforce the skin barrier and can improve skin elasticity and firmness. Different amino acids have specific roles—some support collagen synthesis, others enhance hydration or protect against oxidative stress.
Benefits
- Deep hydration and improved skin plumpness
- Strengthens skin barrier function
- Supports collagen and elastin production
- Reduces fine lines and improves elasticity
- Gentle, well-tolerated by most skin types
Who it suits
- All skin types
- Dehydrated or compromised barriers
- Aging or mature skin
- Sensitive skin
How to use
Use in serums, moisturizers, or toners as part of your regular skincare routine. No special precautions; can be layered with most actives.
Pairs well with
Hyaluronic acid, Niacinamide, Retinoids, Vitamin C
Be careful pairing with
None notable
Safety & cautions
Amino acids are very safe at typical cosmetic concentrations. Those with specific amino acid allergies should patch-test; hydrolyzed proteins may cause issues in rare cases of extreme sensitivity.
Educational information, not medical advice. Concentration and formulation change how an ingredient behaves.