how will i feel after my first b12 injection Vitamin Injections: What You Need To Know B12 Shots at Home: How,

They have exploded in popularity online, with influencers suggesting they can help build muscle, improve metabolism and more

In these cases, they are often taking a B complex that they swallow

PubMed 22962027 TB-4 Phase 1 human safety first-in-human randomized, double-blind, single- and multiple-dose Phase 1 of recombinant human thymosin 4 in healthy volunteers, no serious adverse events: PubMed 34346165

Taking in extra B12 through injections or supplements when your levels are already normal will not provide additional benefits

Formulations are not standardised concentrations vary by compounding pharmacy, which is one reason cross-clinic comparisons and published timelines are unreliable