vitamins

Was wondering where you are supposed to buy vitamins from, I am currently taking my kids cartoon vitamins because they stopped taking them. But I know this stuff is crap because I piss out red urine lol. What are the good stuff and where do I find?

I am a 45 year old man and I'm definitely hitting a midlife situation where my energy levels are starting to drop and I'm feeling like it's becoming a chore just to get in the weight room. I think I might be deficient in a lot of vitamins what is the best product I can use to get me feeling good...