Subcutaneous route: Vitamin B12 Injection Is Given By Subcutaneous Route-Picture Courtesy: Omlet It is the most preferred and common route used to administer vitamin b12 injection for cats
However, its common for blood tests to reveal inaccurate information regarding B12 levels since a high percentage is stored in the liver and not always revealed through testing (for example, taking large amounts of folic acid has been found to mask vitamin B12 deficiency in some patients)
Key gaps to address: dose-response in humans, safety/tolerability profiles across populations, interaction effects in stacks, and long-term cardiometabolic outcomes
In a recent study (4), a randomized direct comparison was made between parenteral and oral supplementation in CE dogs
If you dont supplement, an elevated B12 can be a marker for underlying conditions including liver disease, kidney dysfunction, or certain blood disorders