Medik8 Crystal Retinal is a popular anti-ageing serum (Image: Bethan Shufflebotham)

Skincare fans have got days left to bag a generous discount on science-backed formulas from celeb-loved brand Medik8. The retailer’s Black Friday sale, running until December 2, provides an ideal opportunity for mature shoppers and those mindful of early signs of ageing try the bestselling Crystal Retinal for less than £35 .

The 'world first' formula is considered to be a 'gold standard' anti-ageing product, and for a limited time, it's 25% off. Ideal for those experiencing perimenopausal skin around the age of 45+, it comes in various strengths, with CR1 usually priced at £45, going up to CR24, which costs £109.

However, as part of the Black Friday event, customers can snap up the mo

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