Since vitamin B12 is a water-soluble vitamin and any excess that isnt used is flushed from the body the risk is minimized
Tsuda N, Kawano K, Efferson CL, Ioannides CG
Vaccines 11 Ahlawat S, Asha, Sharma KK (2021) Gut-organ axis: a microbial outreach and networking
However, certain forms of the supplement may not be absorbed well, so its important to find a bioavailable form
Site rotation (abdomen, thighs, upper arms) is the commonly reported approach to reduce this reaction
It had been sending warning letters to the company since 2020 telling it to stop selling unapproved drugs