Biosaccharide Gum-4 is a high-molecular-weight polysaccharide classified as a cosmetic film former. It creates a breathable layer that smooths texture, supports moisture, and improves wear in leave-on products.
Not typically evaluated for comedogenicity — no standardized rating available.
Our take
Is Biosaccharide Gum-4 a Good Ingredient?
As a high-molecular-weight film former, it improves texture and moisture retention and improves product wear, strong functional performance that supports a Good rating, though limited clinical skin-outcome data keeps it from reaching Great. It's stable and broadly compatible in leave-on systems.
What it does
Skin Benefits
Creates a flexible veil that smooths the look of roughness and helps skin hold onto moisture longer, and can improve the feel and wear of leave-on formulas.
Where you'll find it
Uses in Skincare & Cosmetics
Frequently added to primers, sunscreens, and lotions to improve spreadability and film integrity, and also used in setting sprays to provide a light, comfortable finish.
Before you use it
Safety
Typically safe and non-irritating, forming a breathable film on skin. Rare sensitivity can occur with film-forming polymers in very reactive users, so patch testing is prudent. No notable regulatory constraints.