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High doses of oral vitamin B Passive diffusion accounts for about 1% of total absorption 12 (e.g
Oral Pathology & Medicine
Vitamin B12 shots may not be suitable for people with a history of: sensitivity to vitamin B12 Lebers disease, which affects the optic nerve kidney problems hypokalemia (low potassium levels) deficiencies in other nutrients, particularly folic acid and iron Vitamin B12 injections typically begin to work straight away
If you're anemic or vegetarian, your iron might not be the only thing that's low
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