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Oral B12 absorption is not a fixed percentage
If you have a capable helper, then the upper buttocks or arm is a good choice and makes receiving the healthful benefits of B vitamins easier
Moreover, elderly people are also at higher risk as the ability to absorb vitamin B12 naturally declines with age
Age You are more likely to be B12 deficient if you are over the age of 65, as the body becomes less efficient at absorbing nutrients as you go on in life
No published trials have specifically enrolled participants with hepatic or renal impairment, so safety in these populations is unknown
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