should injections of b12 be hydroxocobalamin (Vitamin B12) Injection Vitamin B12 Injections - Vie
Description
The UK's approach differs slightly from recommendations by the European Food Safety Authority (EFSA) , which sets an Adequate Intake of 4 mcg per day for adults, reflecting a more cautious margin of safety

doi: 10.3389/fimmu.2018.00365

This is where the difficulty arises

Bioactive peptides: synthesis, sources, applications, and proposed mechanisms of action