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Several of those together warrant a GP visit

The eye is the only place in the body where nerves can be seen

What is the best type of B12 for a shot

Vitamin B12 is crucial for brain health and cognitive function, as it supports mitochondrial function and neurotransmitter synthesis

[83] Tamoxifen needs to block growth factor proteins such as ErbB2/HER2 [84] because high levels of ErbB2 have been shown to occur in tamoxifen resistant cancers

If you haven't done it already, I think it's a good idea to track down the local B12 deficiency guidelines used by your ICB (Integrated Care Board) in England (Health Boards in Wales/Scotland)