What should you know about melatonin delay puberty?

Puberty depends on coordinated signals between the brain, pituitary gland and reproductive organs. Timing varies between children, and a slower pattern can reflect normal family variation, undernutrition, long-term illness, intense exercise or a hormone-related condition. Melatonin is a sleep-timing hormone. Questions about supplements are reasonable, but stopping or changing a product should be discussed with the clinician who recommended it.

Delayed puberty can involve no breast development by the expected age, no first period after breast development, or little progression of other puberty changes. A clinician may review growth, nutrition, medicines, sleep products and family timing before deciding whether hormone testing or imaging is useful.

Write down the melatonin product, dose, timing, reason for use and any other medicines or supplements. Note growth changes, breast or testicular development, body hair, periods if present, appetite, exercise and ongoing health problems. Take this record to a GP or paediatric clinician.

Do not use melatonin as a way to alter puberty, and do not give a child a supplement that was not recommended for them. A clinician can check whether sleep difficulty needs a behavioural plan and whether the puberty pattern warrants examination or referral.

Arrange a routine assessment when puberty seems not to be starting, stops progressing, or periods have not begun after other puberty changes. Seek earlier advice for poor growth, marked weight loss, persistent headaches, vision changes, excessive thirst, severe fatigue or symptoms of a chronic illness.

Seek urgent help for a sudden severe headache, new weakness, confusion, fainting or a rapid change in vision. These symptoms need prompt assessment and should not be explained away as a supplement effect.

Could this puberty pattern fit family variation, or does it need an endocrine assessment? Should melatonin be continued, changed or stopped? Which growth, hormone or other checks are appropriate? What changes should prompt earlier review?