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First-in-human clinical trials, also known as FIH trials, are studies during which a drug is administered to humans for the first time after its testing in in vitro and in vivo preclinical, experimental models

doi: 10.1016/j.jcpa.2022.02.005

Hamilos DL, Wedner HJ

But they will find that doctors wont want to deviate from NICE guidelines. Dr Richard Cook, a GP in West Sussex said there was no doubt that B12 injections were delayed or stopped during the initial pandemic as it was deemed non essential

Data availability All data used for the statistical analysis are available in the Source data, along with the GraphPad Prism-derived report on the statistical analysis

a chain consisting of 15 amino acid residues