The paper by Mytton, et al,1 rightly points to the growing recognition of vitamin D deficiency in the UK, particularly among black and ethnic minority groups. Their study looked at patients with abnormal vitamin D levels, finding high rates of deficiency and musculoskeletal symptoms among Somali populations. They did not include data on clinical follow up, and so causality should not be assumed. There is a very poor correlation between vitamin deficiency and musculoskeletal symptoms, and both conditions are …