There has been quite a lot of internet chatter lately about serum cocktails - but what is a serum cocktail and is it a good thing?

In short, a serum cocktail is when you mix two or more of your serums together as a ‘power serum’. Why might we do this? Well, the theory is that with so many of us having multiple serums on our shelves, we can save time by mixing them together before applying. Is this a good thing? I would argue not as, for me, it rather defeats the whole point of choosing, buying and using any serum.