can b12 injections cause heavy periods Anemia: Symptoms, Causes, Diagnosis, Treatment, and Prevention Vitamin B12 deficiency - Wikipedia

In cases where a chronic condition is causing a deficiency, people may require B12 shots around every month

Reduced calorie diet combined with NNMT inhibition establishes a distinct microbiome in DIO mice. Scientific Reports (2022): 484

Older adults can use this site if the muscle in their upper arm, their deltoid, is well developed

For IM injections, a 22 to 25 gauge needle is typically used

Acute, rapid regulation of adipose tissue lipolysis occurs in order to maintain the supply of energy substrates during the postabsorptive state and to allow for efficient storage of excess fuels following a meal

I did manage to get the first two by jamming the base of the needle into the ampoule opening, it fitted perfectly