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Side Effects of Excessive B12 Intake Whilst vitamin B12 toxicity is uncommon, several adverse effects have been reported in association with very high B12 levels, though establishing direct causation remains challenging
Most clients benefit from one to two injections per week during the active phase of their program, typically the first six to twelve weeks
Some are absorbed so quickly that there is no enough time for a population of host cells to gather (Kawakami et al., 1997)
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