There is alot of hype and advertising around vitamins and supplements like protein powder. As far as vitamins are concerned, just read the label. If there is 100% of everything - then its good. All the usuals like theregran - m and centrum are perfectly good. In fact better than good because they are a big manufacturer with a long safe track record. It is important to avoid mega doses. If some is good more isn't necessarily better. And in fact, mega doses of the fat soluble vitamins (A E D K) is toxic. There is some evidence mega doses of vitamin C can cause DNA breakage. So, just a plain old vitamin will do. Remember that the FDA does NOT regulate nutritionals (vits and supplements) so they can write pretty much whatever BS on the label they want: "Will make you rich and beautiful in 3 doses!"
For protein, remember animal sources are complete proteins (need nothing else e.g. milk, cheese eggs and of course all meats) Vegetable proteins are incomplete and must be paired in your diet. Legumes plus grains results in a complete protein.