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Long-Term Protocols: The most clinically relevant studies evaluated subcutaneous doses of 0.25 mg (250 mcg), 0.5 mg (500 mcg), and 1 mg (1,000 mcg) administered daily for 24 weeks
Works When Tablets Do Not For people who cannot absorb vitamin B12 through the gut, injections provide a direct and dependable solution
Those with cellular damage and mitochondrial dysfunction
What we do know: In one Dutch study when people with IBS or IBD and normal B12 levels were given a daily B12 supplement, they didnt report any significant improvements in fatigue, depression, or quality of life
While everyone should have proper diet and nutrition there are sections of the population that have a greater need to monitor their B12 levels
That is an important framing for anyone tempted to treat it as a shortcut: even in the animal work that generates the interest, the compound is one input alongside energy balance, not a replacement for it
