Medik8 Crystal Retinal 10 is a high-performance anti-ageing serum for those looking to boost the results of Crystal Retinal 6.We strongly recommend starting on lower strengths of Crystal Retinal if you have not used retinaldehyde before. Revealing younger-looking skin in just one tube* this ground-breaking cream-serum is formulated with 0.1% Retinaldehyde, a super-charged derivative of vitamin A, which works to promote your skin's natural collagen production, rebuild lost collagen and increase cell turnover, promoting a smoother, brighter and healthier complexion. By requiring only one conversion to retinoic acid, the Crystal Retinal works 11 x faster than other forms of retinol*, delivering results comparable to clinical-grade vitamin A. Trials have shown that in as little as four weeks, users have seen a vast improvement in their complexion, with 97% of people agreeing that their skin had a more youthful appearance. Proven to provide a 20% reduction in the appearance of wrinkles, a 2