Bioderma Hydrabio Moisturising Concentrate 40ml Bioderma's Hydrabio Serum is a deeply moisturising concentrate that provides instant and lasting hydration, whilst promoting cell turnover.  Suitable for  sensitive and dehydrated complexions, those who may require an extra TLC of hydration every day. The hydrating daily serum is a lightweight gel formula that immediately melts into skin to leave it feeling nourished. The moisturising concentrate promotes radiant skin , creating a perfect base for makeup application. How to use: Apply a pea size amount every morning and night as the last step in your routine.