4 in 1 Face serum. 30% vitamin C with Nicotinamide  . Anti-aging Hydrating whitening serum. This is a CONCENTRATED and POWERFUL facial serum. It is IMPORTANT that you perform a patch-test of the product 24 hours before regular application to ensure the product is a good fit for your skin. If the formula is compatible with your skin, apply 3-5 drops once daily followed by moisturizer. For external use only.