get the professional grade serum faded, formulated with liposomal vitamin c, retonic, collagen and glutathione. Note:patch test first, and do not use after heavy exfoliators or products with glycolic or retinol. This is a high potency, clinical strength product that tingles for approx. 60 secs. Curated for effective skin care, it stimulates collagen synthesis and delivers antioxidant-rich benefits with enhanced absorption. Revitalize your skin with liposomal vitamin c plus glutathione. Best when used nightly after skin hydro and before moisturizing - wait 3 min. Between layers. Stable magnesium ascorbyl phosphate-phosphatide choline blend for potency up to 3 yrs. Comes in 30ml icon size.