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If you experience progressive neurological symptoms (numbness, tingling, difficulty walking), cognitive changes, or severe anaemia, seek urgent GP assessment
The NIH notes that vitamin B12 deficiency can cause fatigue, anemia, and neurological changes such as numbness or tingling, which is why visit context matters more than simply ordering a wellness shot online
How Much B12 is Too Much
Typically, you can start to feel the positive effects of the IM shot, between 24 - 72 hours post injection, dependent of current levels of B12 in the body
Results within this group showed a reduced IGF-1 secretion40 % lower than those without the polymorphism