Am i right that it's no issue to take lots of different vitamins?

It depends: It depends on what you mean by "lots" and "vitamins." most people -- even when eating a healthy diet -- need a basic multivitamin and omega-3 fats like in fish oil. What your vitamins need to contain depends on your gender, age, general health, and other factors. You can work with a holistic physician on your needs -- also, here's a helpful resource: http://tinyurl.Com/kxdr5on.