Biosaccharide Gum-4

Biosaccharide Gum-4 is a sugar-based film-forming ingredient made by fermenting plant-derived carbohydrates. In skincare, it’s best known for creating a lightweight, breathable veil on the surface of skin or hair. That film can help reduce the feeling of dryness by limiting moisture loss, while also giving formulas a smoother, more cushioned feel. It’s often used in leave-on products like moisturizers, serums, primers, and hair care products where a soft, silky finish is wanted.

For skin, Biosaccharide Gum-4 can make products feel more comfortable and help them glide on evenly. For hair, it may improve slip and help tame a rough, dry feel without adding much weight. People with dry, dehydrated, or easily irritated-feeling skin often appreciate it, as do those who like a non-greasy finish. It’s generally considered a support ingredient rather than a star active, so its benefits are mostly about texture and surface conditioning.

Caveat: because it forms a film, some very oily or buildup-prone users may prefer lighter formulas. As with any ingredient, individual tolerance can vary, especially in complex products with many other components.