I know the best source is the sun which is fine at the moment but whatever supplements have been prescribed by my GP and she has prescribed several different lots over the years I always get constipated if I take them regularly. Even ones I've bought from the health shop have had the same effect. I once bought a very concentrated one from the health shop in tincture form but it was really expensive and had a ridiculous stopper every time I tried to get at the tincture which was in a tiny bottle. It is Vit D3 I've been prescribed. My GP thought it was the calcium and then prescribed me a new brand without the whatever it was that she thought was making me constipated. As soon as I opened them guess what was one of the biggest side-effects? Constipation! Grrr
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