When it comes to fighting acne, we know that quite a few chemical ingredients top the class – but one natural ingredient is right on par with them. Yes, we’re talking about tea tree oil. Mainly known for treating many, many kinds of acne, it is also anti-inflammatory and a champ at killing bacteria on your skin as well. This makes it ideal for acne-prone skin types, or those with fungal skin infections. It's also best to avoid using any other active products like benzoyl peroxide or retinol with this ingredient – tea tree oil works best solo. Pro tip: Never use tea tree essential oils directly on your skin – always mix and dilute it with a carrier oil to avoid any negative reactions.