Proline
Proline is a cosmetic ingredient used as a hair conditioning, skin conditioning agent. It is used in 417 products in our dataset. It is regulated in the EU (listed in a Cosmetics Regulation annex). PubMed carries 3,428 studies of its skin or topical use.
| INCI name | PROLINE |
| Function | HAIR CONDITIONING, SKIN CONDITIONING |
| CAS number | 147-85-3 (L-) / 609-36-9 (dl-alpha) |
| EC number | 205-702-2 / 210-189-3 |
| Prevalence | 417 products (0.45% of dataset) |
| Most used in | Skincare |
| EU status | Restricted (annex ) |
| Scientific studies | 3,428 on PubMed (skin/cosmetic/topical) |
| Monthly searches | 18,100 |
Used in
Serums 21.8%Toners 10.3%General Moisturizers 9.4%Face Cleansers 7.2%Shampoos 7%Conditioners 4.6%
Frequently asked
- What does Proline do in skincare?
- Proline functions as a hair conditioning, skin conditioning agent in cosmetic formulas.
- Is Proline allowed in cosmetics?
- Yes, but it is regulated in the EU — it appears in a Cosmetics Regulation annex with usage conditions.
- What products contain Proline?
- It is most commonly found in Skincare products, especially serums (21.8% of its uses).
Manufacturers with experience using Proline
Match with vetted US contract manufacturers that have hands-on experience formulating with this ingredient.