How to Use "melatonin" with Example Sentences

1. Among other roles , melatonin acts as an antioxidant .

2. Take a tablet of melatonin , an over-the-counter hormone that promotes sleep .

3. Ask your doctor about melatonin supplements .

4. Their hypothesis is that the hormone melatonin might have been the culprit .

5. Melatonin can be found in some plants such as st. john 's wort .