This sustained-release formulation delivers melatonin slowly over several hours to maintain blood levels for a longer period of time.* Three Brands Become One: Since 1969, Klaire Labs has been dedicated to developing clean, efficacious nutritional supplements to ensure optimal outcomes for even the most sensitive individuals. This enduring commitment to quality is at the root of the unification with sister brands ProThera and Complementary Prescriptions. These three brands have unified with a modernized look based on the legacy Klaire Labs logo.