maximum dosage of b12 injections per day Vitamin Injection for Adults: Guidelines Vitamin B12 Injection Dosage for
Description
Ontario Health Technology Assessment Series 2013;13:124

Thinner individuals may require shorter needles, while those with more muscle or adipose tissue may need longer ones to reach the muscle layer effectively

It had limited food-supplement GRAS history in some jurisdictions but Australia's TGA placed it on Schedule 4 (prescription) in 2020

Activity: Moderate exercise influences methylation and energy pathways
