Glycerin
A clear, sweet-tasting liquid that pulls moisture from the air to keep foods, cosmetics, and medicines soft and hydrated.
humectantLow concern
Humectants
Humectants in Skin Care: Glycerin, Hyaluronic Acid & More
Humectants are ingredients that attract water molecules and hold them in the upper layers of the skin, helping to maintain surface moisture. They work by drawing humidity from the surrounding air or from deeper skin tissue toward the outer layer. Because they are effective at low concentrations and blend well with other ingredients, humectants appear on the label of almost every modern moisturizer, serum, and cleanser.
How to spot them on a label
On an ingredient list, humectants often sit in the middle or upper-middle section, which signals a meaningful concentration rather than a trace amount. Knowing what ingredients belong to this group helps you quickly assess whether a product has real hydrating power or is relying on heavier occlusives instead. Common names to scan for include glycerin, sodium hyaluronate (the salt form of hyaluronic acid), and propylene glycol.
Every entry in this group (3)
Hyaluronic Acid
A naturally occurring sugar chain that pulls moisture into skin and joints, widely used in skincare and medical products.
humectantLow concern
Propylene Glycol
A synthetic alcohol used as a humectant, solvent, and carrier that keeps foods and cosmetics moist.
humectantDepends on context
Questions people also ask
Are humectants safe for everyday use?
Regulatory bodies including the FDA and EFSA have assessed the most common humectants and consider them safe for use in cosmetics and food at typical concentrations. Most people tolerate daily use without any issue, though individual skin responses vary. This is educational information, not medical advice.
What is the difference between glycerin and hyaluronic acid?
Glycerin is a small, simple molecule derived from fats or sugars that draws water efficiently and is inexpensive to produce. Hyaluronic acid is a much larger, more complex molecule that can hold a significant amount of water relative to its weight. Both attract moisture, but they differ in origin, cost, and how they feel on skin.
Is propylene glycol a concern in skin care products?
Propylene glycol is approved for use in cosmetics and food by major regulatory agencies, and most people have no reaction to it at the concentrations used in skin care. A small number of individuals report contact irritation, particularly at higher concentrations. If you have known sensitivities, scanning labels with InZoRAH can help you spot it quickly.
Can humectants make dry skin feel worse in low humidity?
In very dry environments, humectants may pull moisture from deeper skin layers rather than from the air, which can leave the skin surface feeling tight if no occlusive is present. Pairing a humectant-rich product with a balm or cream containing an occlusive ingredient helps prevent this effect and keeps moisture where it belongs.
Other ingredient groups
Educational information, not medical advice. Always read the physical label if you have an allergy.
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