With the weather finally warming up, many of us want to update our beauty routines to look fresh and ready for days spent in the sun.The use of vitamin C in skincare has become increasingly popular and is a great ingredient for anyone wanting a radiant, natural glow. One particular product from Garnier that shoppers can't get enough of has had a major discount at Amazon.The online giant is offering 33% off the Garnier Vitamin C Brightening Serum, £8.66 here (was £12.99), saving shoppers £4.33.