Melatonin
Food or supplementMeasured in people, not heightBy mouthHormone
It is the signal the body sends itself at night that it is dark, sold in shops as a supplement.
The hormone made mainly by the pineal gland, circulating at high levels at night and acting through two receptors, MT1 and MT2. It is the body's darkness signal, and in the US it is regulated as a dietary supplement.
Risks. Trial side effects were mild, but products often hold far more or less than the label says, and accidental poisonings in small children have risen sharply.
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Educational content, not medical advice. Nothing here is a recommendation to take or stop taking anything — talk to a doctor about your own situation.