Each batch of vitamin as well as premix comes along with a test report. The vitamins, minerals and premix manufacturers have their own highly sophisticated labs built in-house from where these test reports are issued. The products shipped are meant to use in pharma industry for production of supplements and have very high quality standards and if the end user wants to reconfirm this test report, they can send a representative sample of batch of vitamin or premix to a FSSAI and NABL accredited laboratory for analysis. General practice is to send the vitamin/premix sample every six months as normally the vitamin/premix validation happens through end fortified product analysis and thereby ensuring highest level of purity.