Serious vitamin B12 deficiency may result in anemia, stomach problems, and nerve damage
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Reconstitute slowly
Vitamin B12 Overdose There's no established upper level for B12 because even if you take large amounts of it, your body won't store more than it needs to
Science 333 , 233238 (2011)
The complex refers to a group of key B vitaminsmost notably B1 (thiamine), B6 (pyridoxine), and B12 (cobalamin), each playing a unique role in how your body produces energy, processes nutrients, and supports neurological health