Yarrow (Achillea Millefolium) – Rich in antioxidants and prized for its antimicrobial and healing qualities. Yarrow contains flavonoids, tannins, asparagin, sterols, isovaleric acid and salicyclic acid among other elements. Its natural fatty acids can boost cell membrane production, integrity and performance. In addition to treating acne and oily skin, Yarrow is beneficial for people with irritated and dry skin. Native to the northern hemisphere, yarrow has a storied history as a medicinal herb to treat a variety of skin conditions.