VITAMIN D3 is very important to take while using GcMAF from GcMAF.eu. I spoke with my Doctor and David Noakes from Immuno Bio Tech (GcMaf.eu) and he says it is very important to continue your supplement of D-3. I was confused by reading many posts that discouraged taking GcMAF from GcMAF.eu with Vitamin D-3. Also I would like to say that Immuno Bio Tech GcMAF.eu and David Noakes are fantastic to deal with. I am able to order over the phone using my credit card, their shipments have always arrived on time and well packaged. Also, please read the information on the GcMAF.eu website about many of the studies and treatment guidelines. David Noakes is wonderful person to do business with and after six months on GcMAF I would encourage anyone to consider getting their GcMAF from GcMAF.eu. Good health to everyone in this New Year!