Amino Acids
ah-MEE-no ASS-ids
What Is Amino Acids?
Small molecular building blocks of proteins used in hair care for deep penetration and repair. Hair products may contain individual or blended amino acids from various plant and animal sources.
Source: Various plant and animal proteins (hydrolyzed to amino acid level)
Origin: Natural
Also known as: Mixed Amino Acids, Silk Amino Acids, Wheat Amino Acids
What Does Amino Acids Do to Your Hair?
Penetrate deep into the hair cortex due to their very small molecular size. Strengthen hair from within by supplementing the natural amino acid content of keratin. Improve moisture retention and elasticity at the molecular level.
Best For
All hair types, damaged hair, color-treated hair, fine hair, protein-sensitive hair
Not Recommended For
None known
Concentration Matters
0.1-2% in hair products
Hair Type Compatibility
Method Compatibility
Safety & Regulation
Extremely safe as amino acids are fundamental biological molecules. The smallest form of protein so virtually no risk of protein overload. Well-tolerated by all hair types including protein-sensitive hair.
FDA Status: Generally Recognized As Safe
FDA considers amino acids safe for cosmetic use.
EWG Score: 1/10
HairAide Verdict
The gentlest form of protein treatment available. Because amino acids are so small, they penetrate well and never cause protein overload. Ideal for maintaining healthy hair without risk of stiffness.
Products That Contain Amino Acids
Repair treatments, conditioners, leave-in products, hair masks, professional treatments
Alternatives to Amino Acids
If you want to avoid Amino Acids, look for products with these ingredients instead:
Hydrolyzed Keratin, Hydrolyzed Silk, individual amino acids
Frequently Asked Questions
Yes, Amino Acids has a safety rating of 9/10 and is generally considered safe for use in hair products. Extremely safe as amino acids are fundamental biological molecules. The smallest form of protein so virtually no risk of protein overload. Well-tolerated by all hair types including protein-sensitive hair.
Amino Acids is CG-method approved and is generally considered safe for curly hair.
Yes, Amino Acids is approved for the Curly Girl method.
Some alternatives to Amino Acids include: Hydrolyzed Keratin, Hydrolyzed Silk, individual amino acids
Get Our Free Ingredient Decoder Cheat Sheet
Take the guesswork out of reading product labels. Our printable cheat sheet helps you decode ingredients while you shop.
Check What's In Your Products
Use our free Hair Product Label Analyzer to check any product's ingredient list instantly.
Analyze My Product →