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Vitamin D is fat-soluble and can be synthesised through UVB sunlight exposure, whilst vitamin B12 is water-soluble and must be obtained entirely from dietary sources NHS recommends 10 micrograms (400 IU) daily vitamin D supplementation during autumn and winter for all UK residents B12 deficiency can cause irreversible neurological damage including peripheral neuropathy and subacute combined degeneration of the spinal cord Testing for deficiency should be targeted rather than routine, based on symptoms, risk factors, or conditions affecting absorption Long-term metformin use requires B12 monitoring due to impaired absorption, as advised by the MHRA Table of Contents What Are Vitamin D and B12