how are b12 injections given do you have to be certified to give Guide to Vitamin B12 Injection Sites Best Vitamin B12 Injection Sites:
Description
Vitamin B12 is water-soluble, meaning your body eliminates excess through urine rather than storing it to potentially toxic levels

Older adults might not absorb it as well with age
That said, most users cycle it simply because fat loss goals are achieved within 3-4 months, or they want to assess baseline after treatment

It acts as an activator of AMP-activated protein kinase (AMPK), which is an enzyme involved in regulating cellular energy metabolism