vitamin b12 injection absorption Sublingual vs. B12 Injections: Which Option Is Right for You? – WhyNotNatural What Are the Benefits of

Retrieved August 8, 2023

This is because injections bypass the entire digestive system

Vitamin B12 supplementation can be an important part of treatment for dogs with any of these conditions: Small intestinal bacterial overgrowth (SIBO) Surgeries that shorten bowel length Cancer of the intestinal tract Familial cobalamin deficiency (a genetic condition) Eating a vegan diet that isnt designed by a veterinary nutritionist Veterinarians will routinely run blood tests to check a dogs vitamin B12 levels after they have diagnosed any of these health problems or if the dog has symptoms that fit with a vitamin B12 deficiency

So then I read that that is an incredibly high dose and have lowered it myself to one per week

What the Authoritative Sources Say About B12 Deficiency and Supplementation The National Institutes of Health Office of Dietary Supplements publishes the most thorough citation-backed overview of vitamin B12 its role in red blood cell formation and neurological function, the populations most at risk for deficiency (older adults, people on long-term metformin or proton pump inhibitors, vegetarians and vegans, people who have had gastric bypass surgery), and the recommended daily intake at each life stage