Because some people are asymptomatic or their symptoms can be similar to other nutritional deficiencies, a B12 deficiency may be hard to detect
"If someone experiences benefits or side effects, we don't know if they're from the peptide or because of impurities, endotoxins, or anything else that could be in there," Husain says
Each batch is fully validated for consistent results across various research applications
You also cannot verify absorption the same way you would with an injection
10.1016/j.celrep.2012.01.003 80 Segura-CovarrubiasG.ZhouC.BogdanoviN.ZhangL.TajimaN
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