For B12, the length is the part that does the real work
In other words, it is the most readily absorbed form of the vitamin and it remains in the body for a longer period of time and at higher levels than cyanocobalamin, which means that your body is supplied with vitamin B12 longer
Ventrogluteal (hip) safe but harder to self-inject
At baseline and at weeks 8 and 12, a clinician should assess fasting insulin and HOMA-IR (the homeostasis model assessment of insulin resistance, a calculated index derived from fasting glucose and insulin), HbA1c, high-sensitivity C-reactive protein as an inflammatory marker, and body composition by DEXA scan or bioelectrical impedance
The UK Reference Nutrient Intake for B12 is 1.5 micrograms daily for pregnant women, increasing to 2.0 micrograms during breastfeeding