Aptly named, this easy to incorporate booster serum can be applied neat, mixed with other serums or moisturizers, or used as a spot-treatment on pesky bumps. You'll get 360-degree acne treatment thanks to maximum strength 2% BHA, while Zinc PCA ensures your skin stays hydrated. Additional support actives brighten post-blemish marks, so you can treat acne at the source and minimize the annoying after-effects.