I forgot how effective this serum can be. I work in healthcare and so since May, I've had to wear a mask for the entirety of my shift and with concerns about supplies, we need to wear the same mask 3-4 shifts before we can grab a new one. Even without makeup, oils and dirt build up and my cheeks, chin, and nose are less than pleased with the situation. This serum has helped quite a bit. My blemishes and breakouts don't vanish, but they are noticeably smaller, less inflamed, and are better controlled. I mix one drop with my nightly Vitamin A serum and it works quite well. I wasn't seeing any better improvement with 2 drops when I trialed that, which is just fine. Means the bottle will last me longer. :)