Citrulline
What is Citrulline?
Citrulline is a non-essential amino acid with the chemical structure (2S)-2-amino-5-(carbamoylamino)pentanoic acid. It occurs naturally in foods like watermelon and is produced synthetically for use in cosmetics. Primarily categorized as a skin conditioning agent, it appears in moisturizers, serums, shampoos, and conditioners. In formulations, citrulline acts as a humectant, attracting and binding water to the skin and hair shafts to promote softness and flexibility. It also contributes antistatic properties in hair products, reducing frizz. By participating in the conversion to arginine, it supports nitric oxide production, which may enhance microcirculation upon topical application, aiding skin and scalp vitality without causing buildup.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Enhances skin and hair moisturizing by drawing in hydration
Supports hair conditioning for smoother texture
Contributes to anti-aging effects through improved vitality
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Individuals with dry or dehydrated skin seeking hydration | Persons with rare amino acid sensitivities |
| People experiencing hair dryness or frizz | Individuals allergic to watermelon-derived ingredients |
| Those incorporating anti-aging or protective routines | Anyone preferring to patch test new actives first |
Safety Notes
- Considered safe for cosmetic use by regulatory reviews
- Low potential for irritation in typical concentrations
Frequently Asked Questions about Citrulline
What is citrulline in cosmetics?
A humectant amino acid that hydrates skin and conditions hair.
Is citrulline safe for sensitive skin?
Yes, it shows low irritation potential from safety assessments.
Can citrulline help with dry hair?
It aids moisture retention and smoothness in hair products.