Melatonin 10 mg – Circadian rhythm neurohormone for research

What is Melatonin 10 mg?

Melatonin is a natural hormone produced by the pineal gland, regulating the circadian rhythm (the sleep-wake cycle). Its production rises in the evening and signals to the body that it is "time to sleep". In the research literature it is described as an agonist of the MT₁ and MT₂ receptors and a compound with neuroprotective and antioxidant properties.

A clarification is worthwhile: melatonin is not a peptide, but a hormone (a tryptophan derivative, an indoleamine). In the Peptology catalog, however, it belongs to the same research category as the sleep peptides — peptides for skin, sleep and libido — because it addresses the same research area: sleep and the circadian rhythm, alongside the neuropeptide DSIP and the pineal tetrapeptide Epitalon.

It is a research compound in this form — the product offered by Peptology is a lyophilized research-grade reagent, not intended for the diagnosis or treatment of sleep disorders. (It should be distinguished from the supplements or medicines containing melatonin available in pharmacies.)

In the version offered by Peptology, Melatonin is available in a 10 mg vial as a 100% pure lyophilized powder (without additives), confirmed by independent laboratory analysis (CoA for every batch). The product is intended exclusively for scientific research and in vitro applications.

Variant: Melatonin 10 mg

This page concerns one dosage variant — Melatonin 10 mg. Each vial contains 10 mg of lyophilized melatonin. This is a "strong" amount — in the research literature, typical reference doses are sometimes lower (on the order of 2–5 mg), and 10 mg in a vial allows flexible measurement of many smaller portions in a protocol.

Melatonin is offered in the 10 mg variant. If you are researching a different sleep mechanism, check the neuropeptide DSIP (sleep architecture) or the tetrapeptide Epitalon (the pineal axis, regeneration).

How melatonin works — the circadian mechanism

In the research literature, melatonin is described as the body's main "darkness" signal. Below are the three most frequently studied elements of its action.

Why melatonin acts on the "timing" and not the "depth" of sleep

This is a key distinction in the "sleep" segment. Melatonin is primarily a regulator of the circadian rhythm — it signals when the body should prepare for sleep. It is not a classic sleep aid and does not act mainly on the depth of sleep — that, in contrast, is what the neuropeptide DSIP (delta wave) addresses in research.

A related mechanism is found in Epitalon, which as a pineal peptide is studied for the regulation of the body's own melatonin production. This data comes from studies and does not constitute a claim about the effect of the research-grade product offered by Peptology.

Pharmacokinetics and pharmacodynamics (research framework)

Melatonin is an endogenous hormone with a short window of action, matched to the evening "darkness" signal. The most important research characteristics:

• Class: hormone (indoleamine, tryptophan derivative) — not a peptide
• Targets: the MT₁ and MT₂ receptors of the suprachiasmatic nucleus (the biological clock)
• Profile: short half-life — action focused on the sleep-onset phase and the circadian signal
• Reference doses: often 2–5 mg in the literature; 10 mg is a higher dose, used in selected conditions
• No addiction: studies did not describe classic withdrawal symptoms or addiction
• Route of administration in protocols: per the research protocol (after reconstitution of the lyophilizate)

Comparison: Melatonin vs DSIP vs Epitalon

In the skin/sleep/libido category, three compounds concern sleep, but at different levels. The table below helps you understand how melatonin differs from two related products.

Melatonin sets the timing of sleep, DSIP affects its depth, and Epitalon links sleep with regeneration. In studies, melatonin and DSIP are sometimes paired (with observation of the REM phase). The comparison is indicative in nature and does not constitute a recommendation for use.

Areas of research on melatonin

Melatonin is one of the best-studied regulators of sleep. Below are the most frequently explored directions — described as research areas, not equated with the effect of the research-grade product.

Sleep and circadian rhythm

The main direction of research on melatonin concerns shortening the time to fall asleep, improving sleep quality and synchronizing the circadian rhythm — particularly in models of jet lag, shift work and stress.

Neuroprotection and antioxidation

Melatonin is studied as a free-radical scavenger with antioxidant and neuroprotective properties — among others, in neurodegenerative and inflammatory models. These are research directions, not confirmed therapeutic applications.

Tolerability and no addiction

In studies, melatonin is described as well tolerated, without classic addiction or withdrawal symptoms — unlike many sleep aids. Nevertheless, prolonged use of high doses without supervision is not recommended.

Note: The information is presented for scientific and informational purposes and is based on the research literature. It does not constitute medical advice, a recommendation for use or a claim about the effect of the research-grade product offered by Peptology.

Melatonin profile at a glance

• Pineal hormone (indoleamine) — a regulator of the circadian rhythm, not a peptide
• MT₁/MT₂ agonist — synchronizes the biological clock and signals the time to sleep
• Regulates "when to sleep", not "how deeply" — that is the domain of DSIP
• Studied for jet lag, shift work and stress; additionally antioxidation/neuroprotection
• Related pineal peptide: Epitalon (regulates the body's own melatonin production)
• 100% pure powder with a CoA for every batch

All information provided refers to the research literature on melatonin and should not be interpreted as a promise of effect, an instruction for use or a claim about the effect of the research-grade product offered by Peptology.

Research dosing protocols

In research protocols, melatonin is usually administered after reconstitution of the lyophilizate, matched to the evening circadian window:

• Administration usually in the evening, ahead of the planned sleep (the circadian signal)
• Reference doses in the literature are often on the order of 2–5 mg; 10 mg in a vial allows measuring many smaller portions
• Breaks after 4–6 weeks are described (observation of the body's own melatonin production)
• After reconstituting 10 mg in 1 mL the concentration is 10 mg/mL — calculate precise volumes in the peptide calculator
• Maximum 3 mL of solvent per vial

In combined protocols, melatonin is sometimes paired with DSIP (with observation of the effect on the REM phase). These schedules come from the research literature and do not constitute a recommendation for self-administration.

Side effects and safety

In research observations, melatonin is described as very well tolerated. Side effects are usually mild, more frequent at higher doses. The data concern research on the molecule.

Most reported effects are mild and more frequent at higher doses. Melatonin is not described as addictive, but prolonged use of doses on the order of 10 mg without supervision is not recommended. This information is scientific in nature and does not constitute an instruction for use.

Storage and reconstitution

Melatonin is supplied as a lyophilized (freeze-dried) powder in a vial. In lyophilized form it is stable at room temperature, protected from light and moisture — refrigeration before reconstitution is not mandatory. After reconstitution, stability depends on the solvent used, with Peptide Matrix Water™ significantly extending the solution's lifespan. Melatonin is particularly sensitive to light — protect it from direct illumination.

• Before reconstitution: room temperature, in the original packaging, protected from light and moisture. A refrigerator is not mandatory.
• After reconstitution with Peptide Matrix Water™: stability in the refrigerator +2 °C to +8 °C for up to 60 days under appropriate laboratory conditions — the stabilizing formula extends the solution's lifespan relative to standard solvents.
• After reconstitution with bacteriostatic or sterile water: stability in the refrigerator +2 °C to +8 °C for up to 28 days under appropriate conditions. Do not refreeze the reconstituted solution.
• Reconstitution: in a laboratory setting, Peptide Matrix Water™, bacteriostatic water or sterile water for injection is usually used, depending on the protocol.
• Volume: maximum 3 mL of solvent (capacity of a standard vial). For a precise calculation of volume and units, use the peptide calculator.
• Homogenization: add the solvent slowly down the vial wall, without vigorous shaking, then wait 10–15 min. Swirl gently, do not shake.

Laboratory tip: With your order, you can add Peptide Matrix Water™ to the cart — a stabilizing solution designed for working with reconstituted research compounds. More in the article Bacteriostatic water vs acetic acid vs matrix water.

Frequently asked questions about melatonin

Is melatonin a peptide?

No — melatonin is a hormone (an indoleamine, a tryptophan derivative) produced by the pineal gland, not a peptide. In the Peptology catalog it belongs to the sleep category because of its research application area, alongside the peptides DSIP and Epitalon.

How does melatonin affect sleep?

It primarily regulates the timing of sleep (the circadian rhythm) through the MT₁/MT₂ receptors, signaling to the body that it is "time for darkness". It is not a classic sleep aid and acts mainly on sleep onset and synchronization of the biological clock.

What dose is "typical" in studies?

In the literature, reference doses are sometimes on the order of 2–5 mg. The 10 mg vial is a higher amount, allowing measurement of many smaller portions. This is research information, not a dosing recommendation.

How does it differ from DSIP and Epitalon?

Melatonin sets the timing of sleep (the circadian rhythm). DSIP is studied for sleep depth (delta wave), and Epitalon links sleep with regeneration and regulates the body's own melatonin production.

How is melatonin stored and reconstituted?

The lyophilized vial is stored at room temperature, protected from light (melatonin is light-sensitive) and moisture. After reconstitution, stability depends on the solvent: with Peptide Matrix Water™ — up to 60 days in the refrigerator +2 °C to +8 °C; with bacteriostatic or sterile water — up to 28 days. Avoid refreezing.

Where to buy melatonin for research?

Peptology offers melatonin (10 mg) as a 100% pure lyophilized research reagent with independent laboratory analysis for every batch. Fast shipping, discreet packaging and certificates of purity with the product. For scientific background, also see the article Peptides — what they are, how they work, main categories and safety profile.

Related products in the Peptology catalog

Researchers working with melatonin often also consider related compounds regulating sleep and regeneration from the same category. Each of the products below has a certificate of purity (CoA):

See the full catalog: Peptides for skin, sleep and libido · Peptides for energy and regeneration · Solutions for peptides · All peptides · Blog on peptide research

Laboratory reconstitution

Laboratory protocol — reconstitution, research protocols, storage

Standardized protocol applicable to all research peptides in the Peptology catalogue. To calculate the solution concentration (mg/mL) for each vial, use the peptide reconstitution calculator.

60-second protocol

Quick reference

What you need

Five rules for reconstitution

Calculating concentration

Storage

Four mistakes to avoid

Shipping information

🚚 Shipping information

• Products in our warehouse – orders placed by 15:00 on working days are dispatched the same day, later orders on the next working day.

• Delivery with GLS to your address in 3–5 working days.

• Shipping costs €5 and is free from €50.

Frequently Asked Questions (FAQ)

In what form is Melatonin supplied and how should it be stored?

It is supplied as a lyophilized (freeze-dried) powder in a sealed vial. Store the unopened vial dry and protected from light, ideally at 2–8 °C. After laboratory reconstitution, keep the solution at 2–8 °C and use it within the period stated in the “Laboratory reconstitution” tab (up to 60 days with Peptide Matrix Water).

What purity does Melatonin have and how is it tested?

Every batch has a purity of 99% or higher, confirmed by HPLC and mass spectrometry (MS) and documented in a certificate of analysis (CoA). The report for the current batch is shown in the “Laboratory Analysis” tab.

Is a prescription required to order?

No – the product is for laboratory and research use only.

Where can I buy Melatonin in Europe and what does it cost?

You can buy Melatonin in Europe online from Peptology, from 40,00 €. Delivery with GLS in 3–5 working days. Shipping is free from 50,00 €. Payment by card. Purity 99%+, with an HPLC report for every batch.

Laboratory Analysis

Melatonin - 10mg - Batch - 0226 - Purity