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Side effects and cautions B12 has no established upper limit due to low toxicity, but injections can have side effects: Common: soreness, redness or swelling at the injection site
The results of a 2005 study, for instance, showed that eliminating Methionine in the diets of mice extended life
Always talk to your doctor about the risks and benefits of any treatment
People with low B12 levels, fatigue, dietary restrictions, absorption issues, or symptoms linked to deficiency may benefit after assessment
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