During the period of time I was on Chemotherapy I decided to drop any vitamins and took the drugs they gave me. I went onto my usual Calcium, Vit D, Fish Oil and Magnesium straight after, plus one course of Multi Vitamins, Swisse. For me, I spend a lot of money on natural, healthy food, and its a cost factor. I took a lot of vitamins over the years, because Im still not on any medication since chemotherapy finished, I keep to a minimum. I think that unless we have blood tests, or have professional guidance, its all just guessing. Working in Pharmacy for 5 years, they general have very little evidence behind most of them I found, except Fish Oil, Calcium and the some others with evidence. I have noticed a lot of "May help with....May this, may that" Just my opinion. I was even warned off the Pro Biotics by my Dad who heard theyre not great for a suppressed immune system, so I do the Ohhhhhh so many opinions, its a tricky one.