High Strength Vitamin D3 4000iu K2 100mcg Immunity Bone Health Calcium Absorption Support Tablets Vitamin D3 K2 - Vitamin D3 4000iu & Vitamin K2 100ug Micro Small Vegetarian Tablets Non-GMO UK. HIGH STRENGTH VITAMIN D - Each serving of tablet gives 4000iu of D3 and 100mcg of K2 nutrient.