Skincare buffs will no doubt be well acquainted with science-backed brand Medik8, either from trying it out themselves or reading about its transformative 'reversing' formulas online. With a whole range of skincare staples to choose from, perhaps its most coveted item is its 'award-winning age-defying vitamin A night serum' - the Medik8 Crystal Retinal . In an interview with The Mirror , This Morning beauty guru Nadine Baggott shared that the powerhouse Vitamin A serum is a non-negotiable in