Do You Have a Blood Test?

David Perry: I think we need to kind of wake up and realize life has moved on from this food pyramid. He says supplementation goes a long way for sure because there's things that we just can't do naturally. But he warns people like blood testing is one of the last areas to worry about, so look at quality before you take it. Perry: You don't have to buy the most expensive supplement, but buying the cheapest one is usually not the best choice.