However, the bioavailability of soymilk calcium, both endogenous and fortified, is limited by phytic acid naturally present in soybeans which strongly chelates divalent cations. The bulk of phytic acid is found in the cotyledons. The cotyledons contain as much as 1.6% phytic acid, which is localized in the protein bodies and appears to be distributed between soluble protein–phytate salts and insoluble globoid inclusions. The release of phytic acid resulting from the disintegration of cotyledons in soymilk production renders the chelator more active, which furhter reduces the bioavailability of calcium.