Reputable research vendors generally target 98%-99% HPLC purity and publish the exact figure along with a chromatogram
Li, X.-S., Li, J.-W., Li, H
Vitamin B12 can interact with medications such as colchicine (a medicine used to treat gout), metformin (an anti-diabetic agent), excessive alcohol, vitamin C products, extended release potassium products, antibiotics such as gentamicin, neomycin, tobramycin, anti-seizure medications such as phenobarbital, phenytoin, primidone, medicines used to treat heartburn like H2 blockers such as cimetidine and proton pump inhibitors such as omeprazole, antacids such as ranitidine, cimetidine
DohertyMKDingTKoumpourasCTelescoSEMonastCDasAet alFecal microbiota signatures are associated with response to Ustekinumab therapy among Crohns disease patients
Neurobiol Dis (2008) 31:5873.10.1016/j.nbd.2008.03.003 100 JenkinsTAWongJYHowellsDWMendelsohnFAChaiSY