N-Acetyl-5-Methoxytryptamine
Melatonin (N-acetyl-5-methoxytryptamine) is a neurohormone primarily synthesized and secreted by the pineal gland in response to darkness. It is the master regulator of circadian rhythm, signaling nighttime to the body's internal clock (suprachiasmatic nucleus). Melatonin synthesis follows a clear diurnal pattern: levels begin rising 2-3 hours before habitual bedtime (dim light melatonin onset, or DLMO), peak in the middle of the night, and decline toward morning.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
Activates MT1 receptors in the suprachiasmatic nucleus (SCN) of the hypothalamus, directly promoting sleepiness by inhibiting wake-promoting neuronal firing. MT1 activation also suppresses cortisol and promotes the physiological transition to sleep.
Activates MT2 receptors in the SCN, which are primarily responsible for phase-shifting the circadian clock. This mechanism underlies melatonin's efficacy for jet lag and delayed sleep phase syndrome - it can advance or delay the circadian rhythm depending on timing of administration.
Functions as a direct free radical scavenger (neutralizing hydroxyl radicals and peroxynitrite) and indirect antioxidant by upregulating antioxidant enzymes (superoxide dismutase, glutathione peroxidase). Unlike most antioxidants, melatonin is amphiphilic and can cross all cellular membranes, including the blood-brain barrier and mitochondrial membranes.
Days 1-3: Onset of sleepiness 30-60 minutes after dosing. Reduced time to fall asleep. If dose is too high, morning drowsiness may occur.
Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.
Evidence boundary from the checked abstract: Melatonin is regarded to be a safe and natural sleep aid.
Melatonin is regarded to be a safe and natural sleep aid.
Evidence scope. This entry supports only the exact statement quoted from the live abstract; it does not independently verify OnePin's displayed dose, route, frequency, formulation, population, or broader mechanism.
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: 0.3-1mg; Oral; 1x daily, 30-60 min before bedtime. No checked live PubMed abstract verified this exact displayed dose, route, and frequency for the same molecule/formulation and relevant population.
Primary safety claim: Morning drowsiness or grogginess (most common, often from excessive dosing). No checked live PubMed abstract directly verified this source-JSON safety claim at the displayed formulation, route, and regimen.
Two different questions: what is documented about running these together, and what is documented about drawing them into the same syringe. A good pharmacological partner can still have to be pinned separately.
Check any specific pair in the Stack & Interaction Checker, which answers both questions separately. Absence of a documented conflict is not evidence of safety.
Oral (immediate-release), ~15-20 min SubQ
Oral (significant first-pass metabolism). Higher SubQ.
Sleep-promoting effect
Hepatic (CYP1A2 to 6-hydroxymelatonin, then sulfate/glucuronide conjugation); renal excretion of metabolites
Storage. Store at room temperature in a cool, dry place. Protect from light and moisture. Oral compound - no reconstitution needed.
Available over the counter (OTC) as a dietary supplement in the United States. Prescription medication in the EU (Circadin 2mg prolonged-release), Australia, and many other countries. Not FDA-approved as a drug but generally recognized as safe (GRAS) at standard doses.
Put it to work
Open Melatonin straight into OnePin with your vial and dose pre-filled, then let it handle the syringe math and remind you before the vial runs out.
Open Melatonin in the app →Go deeper
The complete Melatonin walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.
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