Is It A Good Idea To Take Vitamin Supplements While On The HCG Diet? It's no secret that the HCG Weight Loss Diet is a very restricted program - There are many different things that one is not allowed to have while using this particular diet. For instance, you are not supposed to use certain types of shampoos or lotions that contain fatty substances. Of coarse this is something that most people already know - But one thing I often hear people asking about is ... Can you take Vitamin Supplements on the HCG Diet? The short answer is yes you can. Actually, in the original protocol it says that they sometimes allow Vitamin D and C - This is largely due to the fact that some people are concerned about vitamin deficiency. Now in the past I may have said no, taking vitamins on the HCG Weight Loss Diet is not a good idea. But after doing a bit more research on the topic, I have noticed that there are some HCG Protocols out there that do promote the use of vitamin suppl...