Glycerin vs Hyaluronic Acid: which is worse?

What is Glycerin?

Glycerin is a simple polyol (sugar alcohol) that is colorless, odorless, and viscous. It naturally occurs in all animal and vegetable fats and is the backbone of triglyceride molecules. Cosmetic glycerin is typically derived from vegetable oils (plant-based) or as a biodiesel byproduct.

What is Hyaluronic Acid?

Hyaluronic acid (HA) is a naturally occurring polysaccharide (glycosaminoglycan) found abundantly in human skin, connective tissue, and eyes. It can hold up to 1,000 times its weight in water. In cosmetics, HA is typically produced via bacterial fermentation of Streptococcus equi.

Documented risks

Glycerin: Glycerin is one of the safest cosmetic ingredients known, with centuries of use. The CIR has repeatedly confirmed its safety. It is non-irritating, non-allergenic, and non-toxic. At very high concentrations in leave-on products (>30%), it can have a dehydrating paradox effect — pulling water from the dermis if the environment is very dry — but this is not a health risk. It is safe for all ages including infants.

Hyaluronic Acid: Hyaluronic acid is among the safest cosmetic active ingredients available. As an endogenous molecule in the human body, it is exceptionally biocompatible and essentially non-allergenic in topical form. The CIR has confirmed its cosmetic safety. No carcinogenicity, endocrine disruption, or significant adverse effects are documented. Rare reports of pore congestion exist with certain high-MW HA in oily skin, but these are minimal.