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This is determined by a variety of factors including individual metabolism, overall health, and the severity of any existing B12 deficiency
Avoid refrigerating unless the product label specifies otherwise, as temperature cycling can stress the vial seal
99% HPLC purity, COA per batch, discreet EU shipping
By dosage, the mean changes were: 500 mcg: 127% 750 mcg: 176% (single study) 1,000 mcg: 280% 1,500 mcg: 310% 2000 mcg: 260% 5,000 mcg: 62% While 1,500 mcg of vitamin B12 showed the highest average increase, the effect plateaued or declined at higher doses, suggesting a possible saturation of absorption pathways
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