Five kinds of potassium ferrocyanide, sodium aluminosilicate, tricalcium phosphate, silicon dioxide and microcrystalline cellulose are allowed to be used in China, among which potassium ferrocyanide is prohibited in "green" marked foods, and its addition limit in general foods is 0.0 1g/kg. "
Obviously, Amway protein powder belongs to health care products and should be green food, so it is unlikely that potassium ferrocyanide will be used as an anti-caking agent. That leaves only the last four kinds, and among the last four kinds of additives, microcrystalline cellulose and sodium aluminosilicate are insoluble in water, so they can't be used in protein powder, so the only food additives (anti-caking agents) stipulated by the state are tricalcium phosphate and silicon dioxide.