melatonin

Melatonin is a kind of indoleamine hormone synthesized by the pineal gland of the vertebrate,which has extensive biological functions.

褪黑激素是脊椎动物脑中松果腺合成的一种吲哚类激素,具有广泛的生物学作用。

And, as Shives says of melatonin, valerian, and similar substances, "Nobody's regulating this stuff.

而且谢福思还提到褪黑素、缬似物质，“没有人对这些原料加以规定。”