Vitamin D in Israel. This video is for educational purposes only and must not replace advise from your own health care provider. Always consult your own doctor before taking any medication or supplements. Dr Michael Cohen discusses the importance of Vitamin D and zinc for the optimisation of the immune system. Vitamin K2 is also used to distribute calcium to the correct tissues. Thankyou Dr Cohen for this excellent explanation of preventing and minimising infection by enabling the amazing natural immune response.