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Purity issues, even small ones, can throw off an entire study, so researchers tend to be picky about sourcing for good reason

Vitamin B12 deficiency can cause a range of symptoms, these include: extreme tiredness a lack of energy problems with memory and ability to focus sore or red tongue a pale yellow ting to your skin pins and needles vision disturbances depression changes in mood changes in the way you walk and move How can I book a vitamin b12 injection

Conclusion Whilst severe B12 deficiency has a clear clinical picture with characteristic haematological and/or neurological features, establishing mild or borderline deficiency can be problematic as serum levels are maintained at the expense of tissue concentrations, and therefore serum levels of B12 may be in the low normal or borderline range despite a deficiency

If switching between them, allow a 1-2 week washout period between stopping one and starting the other