― I received this 5ml sample of Yves Saint Laurent Forever Youth Liberator Serum in theHarrods Edition GlossyBox. ∙ Claims ∙ Containing the Glycanactif™ complex, a combination of 3 glycans, to help stimulate skin’s youthful capacities at the 3 levels of the skin. ∙ Immediately, the complexion looks more transparent. Signs of fatigue seem less visible. In just 7 days, the skin feels transformed: smoother, firmer and more toned. After 1 month, the skin appears revitalized. [...].