MANTRA Labs harnesses the power of chrono-nutrition to deliver a comprehensive suite of clean, great-tasting and biorhythm-matched products. Optimize your body and mind with a simple, on-the-go system (just add each powdered supplement to water). Zero calories, zero sugar, and zero artificial ingredients. The REST formula is a relax, de-stress and sleep combination that includes magnesium, melatonin, GABA, L-Theanine, and herbs. Wake up rested and super charged to start your next day! MANTRA Labs focuses on holistic physical and mental health and offers a 100% satisfaction guarantee.