Mario Badescu Herbal Hydrating Serum ($30.00) is my go-to for ultra hydrating spot treatment. Sometimes when I use acne treatment products, my skin dries out in certain spots, so to counteract the drying factor of many acne treatments, I always have this at the ready. I use it in conjunction with my usual moisturizer for an extra boost of hydration. I really feel like it “locks” in the moisture. According to Mario Badescu, the Hydrating Serum is good for all skin types, and it can be used as a lightweight hydrator for oily skin as well. A little goes a long way, so for me, the price tag is well worth it!