Certain medications can exacerbate this issue
I'v actually found the smaller gauge needle appropriate for IM deltoid injections as well
Growth of methionine synthesis mutants in laboratory cultures The L-methionine synthesis mutants were first grown in 7H9-Tween-ADC liquid medium, both with and without B12 (AdoCbl, 10 g/mL), to assess their growth in the presence and absence of the vitamin and thus validate their phenotypes
Patients with vegan diets, post-bariatric history, or absorption challenges who need consistent repletion
For research use, material backed by independent HPLC verification and a published batch Certificate of Analysis provides documented confidence in what is supplied
Your doctor will consider factors like your current B12 levels, weight, age, and health goals