And here’s the thing: Is it expensive? Yes. However, I always recommend investing in your serum or moisturizer (as opposed to cleansers) as these tend to have a higher concentration of active ingredients and stay on the skin longer. The 30ml full size lasted me a few months with nightly use and I simply replaced it with a refill capsule. (When the packaging is as beautiful as Nocturnal’s, it really makes me want to reuse it forever.) And since using Polar Night, I haven’t wanted to book a facial or invest in richer moisturizers because my skin is already happy and hydrated. Serums that work smarter and harder? For this.