Vitamin analysis is tricky and needs highly sophisticated setup in terms of instruments and manpower. It depends on the end user whether they are ready to invest in such setup as otherwise they can get help from an external laboratory. There are quite a few reputed accredited laboratories that are functional who can perform required analysis on behalf of them. The test protocols are well defined by AOAC as well appears in each pharmacopoeia. A list of such accredited labs has already been notified by FSSAI on this website.
