Natural gums are polysaccharides of natural origin, that can change the viscosity of a material in solution, even at small concentrations.

• Agar (E406), obtained from seaweed
• Alginic acid (E400), from seaweed
• Beta-glucan, from oat or barley bran
• Carrageenan (E407), from seaweed
• Gum arabic, from Acacia
• Mastic gum, a chewing gum from ancient Greece obtained from the mastic tree
• Sodium alginate (E401), from seaweed
• Spruce gum, a chewing gum of American Indians obtained from spruce trees