Not really a primer but I like to use it as one occassionally. It's labeled as a night treatment for reducing inflammation. If you use a morning moisterizer that leaves you a little shiny, putting this on before your mineral foundation will help it grab onto your skin. I love to use this when my skin is just not happy but I can't use it too often because it dries my skin out. Great to dab on problem areas to dry out pimples. I just feel a little better that I have it on hand. This is my favorite Larenim product.