Dr Michael Holick is a pioneer in vitamin D science and has spent a lifetime researching and exploring what he believes are its potentially life-changing benefits.
He argues that across the world guidelines for the amount of vitamin D we need are simply too low. And that many of us, even those  living in a hot climate, will not be able to get enough vitamin D from sunlight alone.
Dr Horlick contends that not only do we need vitamin D for bone health, we also need it for many other critical functions too. Without a sufficient amount, he says our immune system can’t operate effectively, and that a deficiency of the vitamin is linked to a wide range of other health conditions from heart disease and depression, to auto-immune illnesses and cancer.
In this interview, Michael discusses why he believes vitamin D is so essential and reveals the levels he thinks we all need take for optimal health.
 
Dr Michael F. Holick is a Professor of Medicine, Physiology and Biophysics. He is Director of the General Clinical Research Unit;  Director of the Bone Health Care Clinic and the Director of the Heliotherapy, Light, and Skin Research Center at Boston University Medical Center.
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