Melatonin

Deeper sleep and antioxidant defense, the body's night signal in a vial.

Resets the body clock, the pineal sleep signal for faster sleep onset and easier jet-lag recovery
Injectable delivery reported to act faster and more predictably than oral
A potent antioxidant on top of its sleep role

Studied for

Sleep onsetCircadian timingJet lag

≥99% purity HPLC-tested Longevity

$45per vial

Free shipping over $200 · ships from the USA

Why researchers choose it

Melatonin is the hormone the brain releases to signal night, and a strong antioxidant besides. This is the injectable form, which the guide describes as acting faster and more predictably than the usual pill. It's the go-to in jet-lag and shift-work research.

Reconstitution reference concentration only, not dosing

Set the vial strength and how much bacteriostatic water you draw into it. This returns the resulting concentration for lab handling. It is a dilution reference, not a dosing recommendation.

Vial strength Bacteriostatic water added mL

—mg / mL

Each 0.01 mL — one unit on a U-100 syringe — holds —

Syringe draw	Volume	Amount in that volume

Most compounds reconstitute with bacteriostatic water; a few acid-loving peptides use acetic acid instead. How much to draw, and how many vials a cycle needs, live in the Complete Peptide Guide, not here.

How much, and how many vials for a full cycle?

Protocol and cycle-length questions get answered in the Complete Peptide Guide, not here. These listings carry no dosing.

This compound is supplied for laboratory research use only and is not for human or veterinary consumption. The research summarized here describes published third-party findings, not outcomes from Limitless Peptides, and is not dosing guidance or medical advice. These statements have not been evaluated by the Food and Drug Administration; this product is not intended to diagnose, treat, cure, or prevent any disease.

How to verify what you received

Every batch we list is third-party HPLC-tested to ≥99% purity. When your vial arrives, these are the handling and quality-control checks a researcher runs before use.

Appearance
A uniform white to off-white lyophilized cake or powder with a consistent fill. Copper peptides carry a characteristic blue tint.
Purity documentation
Our material is third-party HPLC-verified to ≥99% purity and identity before it is listed.
Sealed packaging
An intact flip-top seal and rubber stopper, with the compound and batch clearly labeled.
Clean reconstitution
Dissolves into a clear, particulate-free solution once bacteriostatic water is added.

Commonly studied alongside

DSIP(10 mg)

Deeper slow-wave sleep with lower overnight cortisol.

$59

Glutathione(1500 mg)

The master antioxidant for detox, immunity and clearer skin.

$59

What the research reports 5 citations

The pineal hormone that regulates the sleep-wake cycle, and a potent antioxidant in its own right.PubMed: melatonin
It shifts circadian timing and promotes sleep onset, which is why jet-lag and shift-work models rely on it.PubMed: melatonin
Oral is the usual route; this injectable form is described as delivering faster and more predictably.researchdosing: melatonin
Melatonin signals circadian timing rather than acting as a sedative, so study designs pair it with darkness and low stimulation.PubMed: melatonin
Reported side effects include morning grogginess, vivid dreams, mild next-day drowsiness, and headache.Peptide Guide safety review

Compound reference physicochemical facts

Class: Small molecule (indoleamine)
Molecular formula: C₁₃H₁₆N₂O₂
Molecular weight: 232.28 g/mol
CAS number: 73-31-4
Storage: Lyophilized −20 °C; reconstituted 2–8 °C, kept from light
Source: PubChem CID 896

Melatonin$45