I am interested in discovering which is the best source? Sunlight, yes. But is it better to avoid, eg. the PUFAs in cod liver oil when taken as a vitamin D3 suppplement and opt for pill form? I have read that industrial vitamin D3 can be harmful even when kept in reasonable ranges(under 10,000i.u). Generally: Is a food source a better alternative to pills? What evil consequences befall the pill popper if any? The food gobbler? Assuming sunlight availability would it not be best and no added Vit D3?
Sunlight (optimal, the body down-regulates when optimal level achieved) > Supplement (ideal when sun isn't available, no down-regulation) > Food (typically inadequate source by itself)
I have to chime in here. I can tell you this much. I have had chapped lips since starting Paleo. I concurrently started taking Vitamin D supplements. I had chapped lips the entire time. At first I thought it was Vitamin C deficiency. I added eating a couple of lemons every day. Helped only a little. A few days ago, I stopped doing the Vitamin D and the chapped lips are finally going away.
Now, I understand the need for Vitamin D, but at least for me, it was having this not painful but aggravating side-effect.
I don't think you can get as much Vit. D as we seem to need just through food. It's amazing to me that my Vit D level wasn't higher, I've been supplementing 10,000 iu per day for the last few months and I live in Florida, spend 45-60 min a day outside walking and my level was only 67 ng/ml.
@Trevor - this is the Vitamin D3 I use http://www.solgar.com/SolgarProducts/Vitamin-D3-Cholecalciferol-5000-IU-Vegetable-Capsules.htm
I agree with Richard N, you can get required amounts of vit D just from food. Just 100g of herring gives 170% RDA. Traditional Inuit diet confirms this as well. I also do not believe that megadosing of concentrated vit D is beneficial for a healthy body, or any other supplements in such amounts.
Our ancestors didn't take pills. A diet with plenty of vitamin D is not hard to accomplish. Pastured organ meats like liver, fat from grass fed animals who live outside (lard is a very good source of vitamin D), pastured egg yolks, fish liver oil, shellfish, oily fish, butter, cream. Sunlight is not a reliable way of getting vitamin D.
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