Glycine
What is Glycine?
Glycine is the smallest and simplest amino acid, a building block of proteins like collagen and keratin, with the chemical formula C2H5NO2. Naturally present in the body and derived synthetically or from natural sources for cosmetics, it appears in skincare serums, creams, lotions, and hair products. As a humectant, it attracts and retains moisture to support skin's natural barrier. It functions by buffering formulations to maintain optimal pH, reducing static in hair care for better manageability, and forming protective films that enhance smoothness and flexibility on skin and hair surfaces. Its small molecular size allows easy penetration, aiding hydration without greasiness.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Supports skin hydration by drawing moisture into the stratum corneum.
Provides antioxidant protection against environmental stressors.
Enhances hair and skin softness, improving texture and manageability.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| People with dry or dehydrated skin seeking moisture balance. | People with rare allergies to amino acids. |
| Individuals looking to improve hair smoothness and reduce static. | Those experiencing irritation from humectant-heavy products. |
| Those using formulations needing pH stability for gentle care. | Individuals sensitive to fragrance components in some formulas. |
Safety Notes
- Rated low hazard by EWG with scores of 1.
- Deemed safe for cosmetic use by expert reviews like CIR.
Frequently Asked Questions about Glycine
What is glycine's main role in skincare?
It acts as a humectant and skin conditioner to boost hydration and smoothness.
Is glycine safe for sensitive skin?
Yes, it has low irritation potential and a top safety rating.
Can glycine benefit hair products?
It conditions hair, reduces static, and improves manageability.