Ammonium alginate is a chemical compound with the chemical formula NH4C6H7O6.This is an organic ammonium salt of alginic acid.

[1][2] This is also a natural polyuronide found in certain brown algae.

[3] The compound exists in white to yellowish brown filamentous, grainy, granular, or powdered forms.

[4] Soluble in water.

[5] The compound is used in the food industry as a stabilizer, thickener, gelling agent, emulsifier (food additive E403).