Peptides
Melatonin
Also called N-acetyl-5-methoxytryptamine
Melatonin is used to help with sleep timing and some sleep problems. It is not simply a stronger-is-better sedative: when it is taken and whether it releases quickly or slowly can matter as much as the amount.
Dosage & duration
Circadin oral prolonged-release label for primary insomnia in adults 55+.
Circadin
Product label- Dose
- 2 mg orally
- How often
- Once daily, 1–2 hours before bedtime after food
- How long
- Up to 13 weeks
Product- and age-specific; not a general injectable or pediatric schedule.
Sources: 3
Why people look into it
Timing, formulation and the morning after
The useful question is which sleep problem you want to address; a larger amount is not automatically better.
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Sleep timing
Jet lag, a delayed body clock and ongoing insomnia are different problems.
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Release pattern
Immediate-release products and prolonged-release tablets deliver melatonin differently.
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Next-day function
Sleepiness, headache and dizziness can affect whether it is useful for you.
Match it to the sleep problem
Jet lag, a delayed body clock and ongoing insomnia are different problems. A routine that helps one may not help another. Persistent poor sleep deserves more than repeated dose increases.
Immediate versus prolonged release
Immediate-release products deliver melatonin differently from prolonged-release tablets such as Circadin. The example below belongs to that specific oral product and age group, not every gummy, tablet or injectable blend.
The trade-offs
Next-day sleepiness, headache and dizziness can occur. Supplement strength can vary, and long-term safety information is limited. The dose on a wellness blend is not evidence that its route improves sleep.
Dose references and context Existing reported protocols; not personal dosing instructions
This older catalog material includes research and community reports. It has not all been source-checked in this page update and should not be treated as a dosing recommendation.
Circadin EU label — primary insomnia age 55+
2 mg prolonged-release tablet · Oral · Once daily, 1–2 hours before bedtime after food · Up to 13 weeks
Product-specific label context; not interchangeable with immediate-release supplements or injections.
Why isn’t there a plot?
This informational entry has no supported pharmacokinetic model.
Common questions
Is more melatonin always better?
No. The timing, formulation and sleep problem affect usefulness; a larger dose can add unwanted sleepiness.
Does an oral melatonin study support a sleep injection?
No. It does not establish the effectiveness or safety of an injected blend.
Sources Labels, studies and notes behind this guide
Catalog evidence: Human clinical trials. This describes the type of evidence, not a clinical review of every claim.
Summary and fact source checks: 2026-10-07. This records source checking, not medical review of the whole page.
Notes on the quick facts
- Main role
- Timing and the type of sleep problem matter.
- Form matters
- The same mg amount need not produce the same pattern.
- 1. EMA: Circadin assessment and product information
2 mg prolonged-release oral product for short-term primary insomnia in adults 55+; after food 1–2 h before bedtime, up to 13 weeks. Product-specific, not every supplement or injection.
- 2. NCCIH: melatonin evidence and safety
Condition-specific evidence, timing, supplement variability and limited long-term safety information. Does not establish benefit for an injectable sleep blend.
- 3. Circadin manufacturer SmPC
Current oral prolonged-release medicine information inspected; does not validate an injected multi-ingredient sleep blend.
Related compounds and examples
Related compounds
DSIP (Delta Sleep-Inducing Peptide)
DSIP for sleep: falling asleep versus staying asleep, the mixed human evidence and why a wearable deep-sleep score is not the whole outcome.
Relaxation PM
Relaxation PM is a marketed sleep blend. Gold Standard Tides declares GABA, melatonin, arginine and glutamine at a combined 226 mg/mL; it is a research-supplier product, not the same formulation as an approved oral melatonin medicine.
HCG
Why people use hCG for fertility or alongside TRT, how the goals differ, and source-specific IU doses, timing, side effects and storage.