Chances are that you have some sort of supplement in your kitchen cupboards. Depending on the product that could be tablets, pills, oils or even drops. There are a whole range of substances on offer as well, and they all promise to help our health in some way or another. Vitamin C supplements claim to protect our immune system. Omega-3 supplements claim to help you heart, while creatine is used for improving cognition. But do they all do as they claim?