Sleep Hormone May Affect Sex Organs

Melatonin, a hormone available in over-the-counter supplements and popped freely by many frequent air travellers, may affect the sex glands, US and Japanese researchers report.

Tests on Japanese quail show the hormone regulates a sexual pathway believed to be involved in seasonal breeding patterns.

The researchers say it is likely to affect human gonads as well.

"It is a powerful hormone and yet people don't realise that it's as 'powerful' as any steroid.

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