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Immunogenicity and allergic reactions
Conflating temporary irritation with permanent damage spreads unnecessary fear
One study reported that vitamin B12 deficiency was associated with twice the risk of severe depression (4)
Cognitive and Mood Benefits Weight loss is often accompanied by significant psychological shifts
UV light can degrade the benzyl alcohol preservative
Many of these home kits only measure total B12, and not other markers in your blood, such as methylmalonic acid or homocysteine, which are better signs of deficiency, Ren says
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