The Sebastian Professional Penetraitt Overnight Serum contains niacinamide and hyaluronic acid. This restores your hair while you sleep. Hyaluronic acid hydrates, restores and balances the hair's moisture balance. Niacinamide (Vitamin B3) makes hair stronger and stimulates growth. Your hair feels wonderfully smooth and soft in the morning. The hair is cared for, nourished and restored. This serum is suitable for dry and damaged hair and can be used daily.