What it is
In the register’s words: “Biotin is the organic compound.”
- EU register name (INCI)
- BIOTIN
- CAS number
- 58-85-5
- EC number
- 200-399-3
What the register lists it for
These are the uses the European Commission’s CosIng register lists for Biotin in any cosmetic, hair roles first. They say why a maker might add it, not what it does in one formula, and they aren’t a safety rating.
- Hair conditioning
-
The register’s hair role for ingredients that make hair feel softer, smoother or easier to comb. Most conditioners, masks and leave-ins list several.
Register definition: “Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.”
- Skin conditioning
-
A register role for ingredients that help dry or rough skin feel supple again.
Register definition: “Enhancing the appearance of dry and/or damaged skin by reducing flaking and restoring suppleness.”
Where it sits on each label
US labels list ingredients from most to least, except that those at 1% or less may follow in any order. A name near the top is a large part of the formula. A label doesn’t mark where the 1% point falls, so further down, the order says little about how much is in it.
- Shampoos 3 labels First five names: 0 of 3 Shampoos without it
- Clarifying shampoos 1 label First five names: 0 of 1 Clarifying shampoos without it
- Rinse-out conditioners 3 labels First five names: 0 of 3 Rinse-out conditioners without it
- Deep conditioners 3 labels First five names: 0 of 3 Deep conditioners without it
- Leave-in conditioners 3 labels First five names: 0 of 3 Leave-in conditioners without it
- Protein treatments 1 label First five names: 0 of 1 Protein treatments without it
- Heat protectants 1 label First five names: 0 of 1 Heat protectants without it
- Hair oils 2 labels First five names: 0 of 2 Hair oils without it
Every label, product by product (17)
- OLAPLEX No.4 Bond Maintenance Strengthening Shampoo Shampoo 12th of 78 names
- PATTERN Hydration Shampoo Shampoo 11th of 42 names
- Mielle Rosemary Mint Strengthening Shampoo Shampoo 25th of 31 names
- Bounce Curl Gentle Clarifying Shampoo Clarifying shampoo 10th of 31 names
- OLAPLEX No.5 Bond Maintenance Strengthening Conditioner Rinse-out conditioner 19th of 66 names
- PATTERN Medium Conditioner Rinse-out conditioner 11th of 38 names
- Mielle Rosemary Mint Strengthening Conditioner Rinse-out conditioner 10th of 26 names
- Briogeo Don’t Despair, Repair! Deep Conditioning Mask Deep conditioner 14th of 40 names
- Mielle Rosemary Mint Strengthening Hair Masque Deep conditioner 31st of 37 names
- Camille Rose Algae Renew Deep Conditioning Mask Deep conditioner 21st of 25 names
- PATTERN Leave-In Conditioner Leave-in conditioner 6th of 43 names
- Mielle Rosemary Mint Strengthening Leave-In Conditioner Leave-in conditioner 11th of 27 names
- Bounce Curl Moisture Balance Leave-In Conditioner Leave-in conditioner 16th of 21 names
- Briogeo Don't Despair, Repair! MegaStrength+ Rice Water Protein + Moisture Strengthening Treatment Protein treatment 33rd of 35 names
- TRESemmé Protecting Heat Styling Spray Heat protectant 8th of 29 names
- Camille Rose Cocoa Nibs + Honey Ultimate Strength Serum Hair oil 10th of 18 names
- Mielle Rosemary Mint Scalp & Hair Strengthening Oil Hair oil 21st of 32 names
Each line runs from the first name on a label to the last; a dot is where this ingredient sits. Makers change formulas now and then; if the list on your bottle differs, go by your bottle.
Your next step
Other hair conditioning ingredients on these labels
- Glycerin 131 labels
- Panthenol 72 labels
- Cocos Nucifera (Coconut) Oil 69 labels
- Behentrimonium Methosulfate 38 labels
- Caprylyl Glycol 37 labels
- Behentrimonium Chloride 34 labels
- Cocamidopropyl Betaine 34 labels
- Simmondsia Chinensis (Jojoba) Seed Oil 34 labels
Updated · The name, numbers and uses come from the European Commission’s CosIng entry (CC BY 4.0); we write the uses in US spelling and put the hair ones first. The labels are each maker’s own. The order rule is the FDA’s Cosmetics Labeling Guide. All our sources are on the Sources page.