Melatonin 10 mg Prolonged-Release Tablets, 60 ct, QC99820 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Melatonin works in harmony with your natural sleep cycle and promotes relaxation and sleep. Prolonged release tablets slowly release nutrients into the body over an extended period of time. No added yeast, preservatives, artificial flavors or colors, and gluten-free.