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Some individuals may experience: These reactions are generally mild and often resolve within a short period of time
In contrast, the passive diffusion process of B 12 absorption normally a very small portion of total absorption of the vitamin from food consumption may exceed the haptocorrin- and IF-mediated absorption when oral doses of B 12 are very large, with roughly 1% efficiency
Response varies: early sensory symptoms like tingling often improve within weeks, whilst cognitive symptoms may take several months
Archived from the original on 27 September 2007
Upon receipt, the sealed vials must be immediately placed in the refrigerator and stored at 2C to 8C (36F to 46F) at all times
