Concerning supplementing Vitamin D
without additional supplementation of Vitamin K2: it would be great if you could look into that As far as I understood it it seems to be essential to have an optimal intake of Vitamin K2 when supplementing Vitamin D as the body's ability to absorb
calcium is greatly enhanced when supplementing Vitamin D: http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-cofactors/vitamin-k/