Vitamin D is the world’s favorite supplement. Governments around the world recommend people take the supplement for at least six months out of the year. But do we really need these pills? Do they even work? And could they actually be harming us?

In this episode, two ZOE scientists - Professor Tim Spector and Dr Federica Amati reveal the truth about vitamin D.

Tim is scientific co-founder of ZOE and professor of epidemiology at King’s College London. Federica is head nutritionist at ZOE and author of the Sunday Times bestseller ‘Every Body Should Know This’.

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Timecodes:

00:00 The sunshine vitamin

01:50 Quickfire questions

04:05 What is vitamin D?

07:12 Is sunlight the best source of vitamin D?

09:40 Does vitamin D keep my bones strong?

15:34 Are vitamin D levels a marker of good health?

20:00 What counts as normal levels of vitamin D? 

24:42 Supplement controversy

29:10 Do calcium supplements help bones?

31:29 Can I take too much vitamin D?

37:50 Could vitamin D prevent these health conditions?

42:54 Tim’s sunscreen controversy

46:46 Vitamin D and immunity

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Episode transcripts are available here.