Tried and tested: Feed your face with a serum

These potent powders must be activated with water in order to release their glow-giving powers, says Katie Wright. 

Did you know that some skincare products are a lot like vegetables? Hear me out on this one...

In the same way you should steam carrots instead of boiling them in water to preserve the vitamin content, some formulas are packed with powerful, but delicate nutrients that have to be kept dry to maintain their potency.