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The one where it all began. Medik8’s classic youth-renewing retinol serum that kick-started their innovations in vitamin A technology.. KEY BENEFITS. This 0.3% retinol-infused serum is designed to complement skin’s nightly regenerative cycle; working to rejuvenate the appearance of skin while you sleep to restore visible radiance and smoothness.. RESULTS. Retinol 3TR helps to soften the appearance of fine lines and wrinkles, while promoting a visibly brighter complexion.. KEY INGREDIENTS. Retinol (vitamin A), Vitamin E, Jojoba Oil