Experience the perfect synergy with Medik8 Pack C-Tetra Serum, 30 ml + Crystal Retinal 3, 30 ml. C-Tetra Serum delivers antioxidants throughout the day, protecting against free radicals, while Crystal Retinal 3 rejuvenates the skin at night with its powerful retinol. Achieve radiant, revitalized skin for 24 hours. Instructions for use For best results, apply Medik8 Pack C-Tetra Serum, 30 ml, to clean, dry skin in the morning. In the evening, apply Crystal Retinal 3, 30 ml, avoiding the eye area. Massage gently. Complete your daily skin care routine. Avoid direct contact with eyes.