There have been a few studies over the last few years that suggest that multivitamins aren't really necessary. If you're eating a balanced diet of fresh produce, good lean meats, dairy, carbs, etc. then the extra dose is generally going down the toilet.
Now, if your diet consists of primarily boxed, heavily process foods or fast foods then by all means, take something over the counter.
My sister ate ridiculous amounts of supplements in her thirties and forties but smoking killed her at 56!
Diet and movement, when I'm active, my knees feel better, my body feels better, everything feels better!