If a real doctor said that you have to do it it probabbly means that you have to but if it was only some guy who's job is just a distribution of pills, you should be really careful and go to the real doctor at first.

Generally, people can't get enough Viramin C or others from food. Experts says we need to have 5 dishes a day for daily vitamin intake. It seems impossible for most people. Today, people are very busy and difficult to meet nutrient balance. By the way, do you know a company in the US, Amway? I heard the vitamin products of the company was nice. Is it true?

I don't take any supplements to my diet... and I feel fine. When I take them I feel the same as when I don't. This makes me wonder if I need them at all. Vit C comes from citrus - so if you eat oranges, lemons or limes - you will get Vitamin C Vit D is made by the skin when you stand in the sun - so if you go outside - you will not need a supplement Omega 3 comes from fish - eating fish will give you Omega 3 Of the three - I usually take Omega 3 because I don't eat enough fish (its expensive here in the UK). I spend time in the sun (when it shines) and I eat healthy (which helps with getting Vitamin C) Hope this helps.