Medik8 Crystal Retinal 1 30mlMedik8 Crystal Retinal 3 is a high performance overnight serum designed to accelerate skin renewal and combat signs of aging. Formulated with 0. 03% retinaldehyde, a next generation vitamin A derivative, this serum delivers retinol like benefits with reduced irritation. Clinical studies have shown that retinaldehyde acts 11 times faster than traditional retinol, providing visible improvements in skin texture and tone. Key Benefits: Accelerated Skin