Among other roles , melatonin acts as an antioxidant .

对于其他的来说，褪黑激素担当的是抗氧化剂。

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

吃一片褪黑素，这是一种能够促进睡眠的非处方荷尔蒙类药物。

Ask your doctor about melatonin supplements .

也可以询问医生是否需要补充松果体素。

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

他们猜想荷尔蒙的褪黑激素是产生该差异的主要原因。

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

褪黑激素可以从一些诸如神约翰斯麦芽汁一类植物中摄取。