(PubMed) Shrubsole MJ, Shu XO, Li HL, et al
Many vegans dont think [they] need to worry about B12, or they think that meat-eaters get B12 deficiency just as often as vegans do, while others think you have to supplement with methylcobalamin rather than the less expensive, more reliable cyanocobalamin. Mangels notes, Some people think they have enough vitamin B12 stored and they dont need to worry about [it]
Recent research supports this partnership approach
If your body doesnt have enough Vitamin B12 to make red blood cells, which transport oxygen throughout your body, you may be unable to efficiently transport oxygen to your bodys cells, making you feel too tired and weak to exercise
Your healthcare provider will determine the appropriate dosage and treatment schedule based on your goals
Some health problems can make it hard for the body to take in vitamin B12