Melatonin
Circadin, Melaxen
Forms: Immediate-release and prolonged-release (Circadin) forms; gummies and sprays.
Body-clock hormone released by the pineal gland at night; sold as a sleep aid. It can add to the drowsiness of sedatives and alcohol.
Legal status: A supplement in the US; a prescription medicine in the UK and Australia; elsewhere the rules vary by country and product.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Used to fall asleep faster, ease jet lag before competitions and get to sleep after late training or stimulants. It shifts the body clock rather than sedating; in trials people fell asleep about 7 minutes sooner on average.
What people seek and what studies show
A Cochrane review found it clearly reduces jet lag after flights across five or more time zones, more so eastward; taken at the wrong time of day it can cause daytime sleepiness and slow adaptation. In insomnia trials it added about 8 minutes of total sleep and slightly improved sleep quality, with no loss of effect over time. In delayed sleep phase it moved sleep onset about 40 minutes earlier.
Effects
Evidence: Approved medicine — studied in people for its medical use
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
2 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 2 of 2 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. No measure removes a risk completely.
Low-level side effects
How each option helps (2)
- Working with a doctor — Mood problems, especially after stopping steroids, are treatable; a doctor can refer you to mental-health care.
- Sleep hygiene — Good sleep supports mood, especially in the low-hormone phase after stopping steroids.
How each option helps (2)
- Working with a doctor — Assesses persistent vomiting or severe belly pain (possible pancreatitis or gallstones) and adjusts prescribed GLP-1 treatment when nausea persists.
- Pancreatin + dimeticone (Pankreoflat) — May ease heaviness and gas after meals; can cause nausea or diarrhea. Not for pork or cow's milk protein allergy (anaphylaxis reported) or early acute pancreatitis.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
For women
Not recommended in pregnancy or breastfeeding: safety data are lacking.
Myth & fact
“The label tells you how much melatonin you take.”
Often not. Canadian lab tests found 17% to 578% of the labeled amount, and 8 of 31 products contained serotonin; US gummies held 74% to 347%.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check