In the summer months we should get vitamin D naturally from sunlight, in the winter we should supplement it from food sources. However, the usual diet does not meet the preventive recommendations and it is therefore advisable to ensure a sufficient supply from supplements. Most experts recommend taking vitamin D in a basic dose of 1000 IU year-round. If supplementing with vitamin D, it is advisable to also support supplementation with an optimal amount of vitamin K2. This mixture is then an ideal dietary supplement as it contains both nutrients in an optimal ratio.