vitamin b12 injection drug information at a Licensed Pharmacy CYANOCOBALAMIN INJECTION, USP 10,000mcg/10mL (1,000mcg/mL)
Description
Round up for partial units 375 mg at per 10 mg = 38 units (37.5 rounds up)

however, the primary reason for this choice is tolerability rather than proven superior absorption

injection to be used by or under the supervision of a veterinary surgeon

Chatterjee et al

As youll see, the Botox for migraines injection sites precisely target a large number of nerves that travel throughout the face, head, scalp, neck, and shoulders
