Night Serum is an essential night-time skin care product that revitalizes and helps the skin rediscover its natural balance.If you are new to oil-free night care and your skin is used to an oil-based cream at night, if needed at night, cleanse then apply a pea-sized amount of a Dr. Hauschka mask for 20 minutes. Gently wipe clean with a damp wash cloth, then tone and apply Night Serum. Within a week, your skin will adjust to oil-free night care and the mask will no longer be needed.For advanced care seasonally and as needed, add Renewing Night Conditioner or Sensitive Care Conditioner to your night care regimen. This will replace your toner and Night Serum.