All Gressa’s products are paraben and sodium laureate sulfate free (SLS). In the cosmetic industry, parabens can be used as a preservative, and SLS is used as a surfactant and emulsifier.  The Minimalist Corrective Serum Foundation is oil-based, oil is also a preservative, so Gressa doesn’t add additional preservatives to the formula.Since the foundation also does not contain emulsifiers, remember to shake your foundation before application! Separation is natural, but don’t worry, once applied the oil easily absorbs into the skin giving you an even, semi-matte finish.