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Interesting article on the link below (and a pretty huge number of people involved in the study). I know that calcium levels are involved in some ways with cardiovascular risks etc, and that there are interactions between calcium and Vit D3, with some impacts if there is inadequate Vit K in your system. I note that the study did not appear to consider any factors other than Vit D3 levels.
http://www.ncbi.nlm.nih.gov/pubmed/25710567

Vit K's role in the scheme of things
http://www.ncbi.nlm.nih.gov/pubmed/25245999
http://www.ncbi.nlm.nih.gov/pubmed/22398856
http://www.ncbi.nlm.nih.gov/pubmed/21155624
http://www.ncbi.nlm.nih.gov/pubmed/11706280
http://www.ncbi.nlm.nih.gov/pubmed/18374202
http://articles.mercola.com/sites/artic ... and-k.aspx

And then there are yet more and sometimes contradictory studies:
http://www.ncbi.nlm.nih.gov/pubmed/19549021
http://www.ncbi.nlm.nih.gov/pubmed/25332334
http://articles.mercola.com/sites/artic ... ilure.aspx
http://www.ncbi.nlm.nih.gov/pubmed/23446902

Seems that the most sensible option is to not go overboard - i.e. even if extra is good then excessive amounts of "extra" may not necessarily be the best thing for you...
Professor Jelinek recently posted an answer to the Vitamin K question, to the effect that we can get all the nutrients we need from our plant-based diet and that we get K1 from our old friends the green leafy vegetables, which the body then converts into K2. So no need for another supplement, just vit D and linseed oil alongside the plant-based vegan diet are enough!

General comments about the need to supplement with vitamin K are going to be more relevant to someone on an average Western diet, which is typically poor in healing plant foods and low in Omega 3 fats.
Wendy

Diagnosis Dec 1998 OMS Feb 2010 Retreat Feb 2012
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