Understand what’s inside your hair care
Clear, independent information about the ingredients on hair-care labels, read from the actual labels in our product library. Decide for yourself what belongs in your routine.
2,252ingredients analyzed
6,816products researched
171,139label placements read
Proteins and amino acids
Fragments that bind to the hair surface and temporarily stiffen it. Welcome on damaged hair, unwelcome on hair that already feels rigid.
127 published entries, most-listed first. The number beside a name is how many products in our library list it.
- Arginine385
- Hydrolyzed Rice Protein292
- Hydrolyzed Wheat Protein292
- Hydrolyzed Keratin287
- Histidine267
- Hydrolyzed Quinoa263
- Glycine255
- Hydrolyzed Vegetable Protein PG-Propyl Silanetriol255
- Hydrolyzed Silk249
- Hydrolyzed Soy Protein231
- Hydrolyzed Vegetable Protein219
- Serine216
- Threonine165
- Silk Amino Acids162
- Alanine155
- Proline155
- Glutamic Acid147
- Aspartic Acid144
- Hydrolyzed Pea Protein144
- Valine136
- Phenylalanine134
- Isoleucine133
- Hydrolyzed Collagen103
- Keratin Amino Acids101
- Ceramide NP95
- Keratin78
- Arginine Hcl76
- Biotinoyl Tripeptide-175
- 2-Oleamido-1,3-Octadecanediol72
- Wheat Amino Acids72
- Hydrolyzed Corn Protein65
- Cocodimonium Hydroxypropyl Hydrolyzed Keratin62
- Lysine Hcl60
- Hydroxypropyltrimonium Hydrolyzed Wheat Protein55
- Ceramide NG52
- Laurdimonium Hydroxypropyl Hydrolyzed Keratin46
- Hydrolyzed Lupine Protein45
- Cystine Bis-PG-Propyl Silanetriol44
- Hydrolyzed Oat Protein43
- Acetyl Tetrapeptide-341
- Hydrolyzed Adansonia Digitata Seed Extract41
- Amp-Isostearoyl Hydrolyzed Wheat Protein39
- Copper Tripeptide-138
- Avena Sativa (Oat) Peptide35
- Ceramide AP33
- Pisum Sativum (Pea) Peptide33
- Ceramide EOP32
- Cetearamidoethyldiethonium Succinoyl Hydrolyzed Pea Protein30
- Creatine30
- Rice Amino Acids30
- Caviar Extract29
- Sarcosine29
- Hydrolyzed Wheat Protein PG-Propyl Silanetriol28
- Ethyl Ester Of Hydrolyzed Silk27
- Soy Amino Acids25
- Hydrolyzed Adansonia Digitata (Baobab) Seed Extract22
- Hydrolyzed Jojoba Protein22
- Hydrolyzed Carrot Protein21
- Hydrolyzed Kale Protein21
- Cysteine20
- Hydrolyzed Cicer Seed Extract19
- Hydrolyzed Milk Protein19
- Quaternium-3319
- Triticum Vulgare (Wheat) Protein19
- Tyrosine18
- Copper Tripeptide-3417
- Hydrolyzed Yeast Protein17
- Leucine17
- Sericin17
- SR-Spider Polypeptide-117
- Cocodimonium Hydroxypropyl Hydrolyzed Wheat Protein16
- Hydrolyzed Lemon Protein16
- Hydrolyzed Pearl16
- Lysine16
- Glycoproteins15
- SH-Polypeptide-12115
- Sodium Cocoyl Amino Acids15
- Collagen Amino Acids13
- Ethyltrimonium Chloride Methacrylate/Hydrolyzed Wheat Protein Copolymer13
- Taurine12
- Chenopodium Quinoa Seed11
- Hydrolyzed Barley Protein11
- Hydrolyzed Pea Protein Pg-Propyl Silanetriol11
- Citrulline10
- Hydrolyzed Keratin Pg-Propyl Methylsilanediol10
- Hydrolyzed Wheat Protein/Pvp Crosspolymer10
- Lactobacillus/Honey/Keratin Ferment10
- Hydrolyzed Elastin9
- Cocoyl Hydrolyzed Keratin8
- Elastin8
- SH-Oligopeptide-788
- Cocodimonium Hydroxypropyl Hydrolyzed Rice Protein7
- Methionine7
- Oxidized Keratin7
- Pisum Sativum Peptide7
- Saccharomyces Polypeptides7
- Sodium Lauroyl Hydrolyzed Silk7
- tryptophan7
- Yeast Amino Acids7
- Asparagine6
- Cocodimonium Hydroxypropyl Silk Amino Acids6
- Hydroxypropyltrimonium Hydrolyzed Rice Protein/Siloxysilicate6
- Pentapeptide-29 Cysteinamide6
- Pentapeptide-30 Cysteinamide6
- Tetrapeptide-28 Argininamide6
- Yogurt Powder6
- Albumen5
- Avena Sativa (Oat) Protein Extract5
- Ceramide NS5
- Collagen5
- Hydrolyzed Amaranth Protein5
- Sodium Cocoyl Hydrolyzed Soy Protein5
- Yogurt Extract5
- Laurdimonium Hydroxypropyl Hydrolyzed Barley Protein4
- Laurdimonium Hydroxypropyl Hydrolyzed Wheat Protein4
- Royal Jelly4
- Sodium Cocoyl Apple Amino Acids4
- Ceramide 33
- Glycine Soja (Soybean) Protein3
- Hydrolyzed Adansonia Digitata (Baobab) Seed Protein3
- Hydrolyzed Cannabis Sativa Seed Extract3
- Hydrolyzed Protein3
- Phytosteryl/Octyldodecyl Lauroyl Glutamate3
- SH-Oligopeptide-281 SP3
- Silk Protein3
- Steardimonium Hydroxypropyl Hydrolyzed Keratin3
- Vegetable Amino Acids3
How the library works
- An entry gets a page once it has a written description and appears in at least three researched products. Below that we leave the name as plain text on the product pages rather than publishing a page with nothing on it.
- US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Position tells you about relative amount only above that line, and we never convert a position into a percentage.
- We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
- Nothing on these pages is paid placement, and we do not sell any of the products they link to.
