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Brown or amber coloring means oxidation has occurred
But your well-being should never feel like a headacheand with Everlywell's vitamin B12 supplements, it's easy to get this key nutrient (as well as a range of other vitamins and supplements)
High-dose oral B12 (1,000 to 2,000 mcg daily) can actually correct deficiency even in some people with poor absorption, because a small percentage of B12 is absorbed passively (without intrinsic factor)
PMID 2137911 Subcutaneous injection-site pharmacokinetics FDA review
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