Kiehl’s super multi-corrective eye-opening serum has a milky consistency and only a drop is needed as a little goes a long way. Unfortunately I struggle to obtain only the little I need from the sample sachet thus it feels like I am wasting product. I presume one would have more control over dispensing of the eye-opening serum with the 15 ml pump bottle it is available in for purchase. I am very careful to apply the serum to the outer areas of the eyes, yet I feel a slight burning sensation on application. Luckily this goes away after a minute and I experience no further discomfort.