A lightweight alternative to the original Y Theorem Serum, this formula reaps the same unrivalled benefits but with a lighter, fluid texture. The beauty of this weightless serum is to offer a suitable product for more humid conditions and people with oily skin, or for times when less rich skincare is called for, but still delivers a powerful formulation that is packed full of incredible antioxidants and brightening agents. The result is a hydrated, restored, and radiant complexion.