Suboptimal levels of vitamin D are now recognised as a worldwide public health problem (1), having a range of effects through many mechanisms. A wide range of individuals – even the supremely fit – can have suboptimal vitamin D levels. This article provides an overview of the current understanding of vitamin D, its effects, mechanisms, measurement and approaches to supplementation.
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Professor Cathy Speed BMedsCi, Dip Sports Med, MA, PhD, FRCP, FFSEM (i) (UK) is a consultant in Rheumatology, Sport & Exercise Medicine.
She is based at The Fortius Clinic, London, and at the Cambridge Centre for Health and Performance in Cambridge. She is also a senior physician for the English Institute of Sport.
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