Best For 25+ Sensitive Skin Normal Skin MAP Benefits Non-irritating Non-comedogenic Skin Firming Pore Tightening Cell Detoxification Sun Damage Skin Tone Correction More About MAP (Magnesuim Ascorbyl Phosphate) Vitamin C MAP is a water-soluble derivative of vitamin C that is rapidly gaining popularity in skin care. It’s stand-out features are that it’s non-irritating, and it’s more stable than L-ascorbic acid. Research is also finding that it appears to be just as effective as ascorbic acid in the stimulation of collagen production. Overall, MAP appears to be a better choice than L-ascorbic acid vitamin C for people with sensitive skin and those wishing to avoid any concomitant exfoliating effects. Other vitamin C formulas can be highly acidic and therefore produce exfoliation. MAP vitamin C has been widely used in various cosmetics and quasi-drugs because of its advantageous properties such as inhibitory effects on melanogenesis, promotion of collagen synthesis, and prevention of lipid peroxidation. MAP plays an important role in preventing dry skin, sunburn, chloasma and ephelides, and in keeping the skin healthy and young. MAP is a phosphate ester, therefore, it is easily hydrolyzed to ascorbic acid in the skin by enzymes (phosphatase), and it shows physiological and pharmacological activities. Shipping Domestic Shipping: All orders are shipped USPS. In-stock orders are shipped within 1-2 business days, unless a delay is otherwise noted on the website home page, or if the order is being held for insufficient address or per customer request. We do not ship on holidays or weekends. International Shipping: All orders are shipped USPS. Please allow 7-10 days for shipments to UK, Canada, Australia, and most European countries. Depending on location, shipments can take up to 3-4 weeks for delivery to some locations with Economy Shipping. If you are in a rush for your package, please choose Express Shipping at checkout.