Q+A Zinc PCA Facial Serum helps to assist collagen production, minimise pore size, increase hydration and improve skin firmness. Using three key ingredients, Q+A Zinc PCA Facial Serum is designed to help improve the appearance of blemish prone skin: Zinc PCA: helps to balance oil levels and minimise pores. Reishi and Shiitake Mushrooms: contain anti-ageing properties and aid skin collagen production. Vegetable Collagen: Vegetable collagen helps improve firmness and elasticity, resulting in skin looking plumper and more youthful.