Vitamin supplementation doesn't seem to be a good idea unless you have some specific deficiency. There's various research that suggests that those who take vitamin pills actually have worse mortality rates than those who don't.
Stop taking the pills.
I take 75 mg aspirin daily for its anti-inflammatory effects, there appears to be good data showing it cuts the risk of various cancers. Other than that I'll use whey protein when training to speed recovery and help maintain muscle mass, but I don't really regard that as a supplement, it's just a convenient way of ensuring I get >1 gram of protein per kilo of bodyweight per day. And I eat a fair bit of oily fish, but don't supplement with fish oil capsules.