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Think of the difference this way

doi: 10.1016/j.diabres.2020.108125 66 IvashkinV.FominV.MoiseevS.BrovkoM.MaslennikovR.UlyaninA.et al
Key Features High Purity : Manufactured to exceed 99% purity, verified through HPLC and LC-MS testing protocols

Oxidative Medicine and Cellular Longevity, 2013

Further to this, Gan et al
