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Nothing. If you can't get all you need from the surplus of food that we have then you've got bigger problems. The supplement/bodybuilding market is 99% snake oil. Why else do you think it's worth $38 billion?
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Vitamins, anti-oxidants and stuff do more harm than good if you eat a normal diet. Your body makes way more endogenous anti-oxidants, catalytic ones that can be reused, than you could possible eat. When you add extra it down-regulates your endogenous response. You want to UP-regulate it with polyphenols not down-regulate it with vitamin pills. Eat plenty of garlic, cinnamon, peppers, spices, berries, fruit, cruciferous veggies, red wine, dark beer, coffee, fermented probiotics, prebiotics and you're good.
http://nautil.us/issue/15/turbulence/fruits-and-vegetables-are-trying-to-kill-you
ETA: and don't juice either. Eat it whole motherfucker! The polyphenols and prebiotics are in the skin!