WHY BUY PROWISE D34000 IU & Vitamin K2 100μg Tablets?. : Vitamin D3 & K2 work really well with each other. Max Strength 4000IU per Tablet. Benefits of Vitamin D: Aids in the normal maintenance of our bones, teeth, muscles, and immune system that is why we call them “Sunshine Vitamins” it gives you all the benefits without the Sun.