ST. MORIZ Miracle Tanning Serum is a streak free formulation packed with ingredients proven to reduce the effects of ageing skin whilst leaving your skin glowing, and hydrated. Stretch marks and wrinkles are visibly rreduced, and skin is ?rmer after just 2 weeks of use. Whilst gradually building and maintaining beautifully bronzed skin. Clinical studies showed that collagen and elastin were increased after just 2 weeks, wrinkles were visibly reduced after 28 days, and stretch marks were visibly reduced after 56 days of use.