Glycerin

Benefits
Hair Structure ImprovementMoisturizingSofteningHair Gloss

What is Glycerin?

Glycerin, chemically known as glycerol or 1,2,3-propanetriol, is a simple polyhydric alcohol (C3H8O3) produced through hydrolysis of fats and oils from vegetable or animal sources, or via synthetic processes like propylene oxide hydration. In cosmetics, it serves as a multifunctional ingredient across skincare, haircare, and oral products. Primarily functioning as a humectant, it draws atmospheric water and retains moisture within the skin's outer layers, promoting plumpness and barrier support. As a solvent, it dissolves hydrophilic actives and aids uniform distribution. It also modulates viscosity for smoother textures, acts as a skin protectant by forming a light film, and contributes to conditioning in hair formulas by reducing friction. Its hygroscopic nature makes it ideal for anhydrous and aqueous systems alike, ensuring stable hydration without greasiness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1-2 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Denaturant
Makes ethanol undrinkable (for regulatory/tax purposes) and can influence dry-down and sensory feel in alcohol-based sprays, toners, and fragrances.
Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Hair conditioning
Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.
Humectant
Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.
Oral care agent
Supports oral hygiene performance (cleaning, freshening, plaque control, sensitivity support) in toothpaste, mouthwash, and related products.
Oral health care drug
A regulated active used in oral products to treat or help prevent a specific condition (e.g., caries, gingivitis), subject to local OTC drug rules.
Skin protecting
Forms a barrier to protect skin from external irritants.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.

Benefits

Delivers moisturizing action by binding water to skin and hair.

Supports softening and improved manageability for dry skin and hair.

Enhances hair gloss and structure for better appearance.

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.
Rare cases of glycerol sensitivity or allergies.
People looking to improve hair shine and softness.
Individuals in very low-humidity environments at high concentrations.
Those needing gentle conditioning in daily routines.
People preferring oil-free textures due to its humectant feel.

Safety Notes

  • Rated low hazard (EWG 1-2) with broad regulatory approval for cosmetic use.
  • Non-comedogenic (rating 0), suitable for acne-prone skin.

Frequently Asked Questions about Glycerin

Is glycerin safe for sensitive skin?

Yes, it has low irritation potential and is widely approved for use in cosmetics.

Does glycerin clog pores?

No, with a comedogenic rating of 0, it does not promote acne.

Can glycerin benefit hair?

Yes, it improves shine, softness, and structure in hair products.