Joint Complex | 30 CapsulesESM, Eggshell Membrane, is obtained by a natural process using water, by mechanical action, washing and drying, and does not undergo any further treatment that would cause hydrolysis of the collagen it contains. ESM is the internal eggshell membrane with the highest collagen content on the market. It is 100% natural, non hydrolysed collagen. ESM eggshell membrane contains approximately 35% non hydrolysed collagen (Types I, V and X), about 6%