Hydroxypropyl Methylcellulose Also known as Hypromellose or HPMC What is Hydroxypropyl Methylcellulose? Hydroxypropyl Methylcellulose (HMPC) is a polysaccharide additive used in frosting, coatings, gluten-free baking and dietary supplements. It is also a stabilizer, thickener, fat replacer, bulking and binding agent. 1 Several types of HPMC are available commercially in several degrees of [...]