Melatonin

Melatonin (N-acetyl-5-methoxytryptamine) is an indoleamine neurohormone synthesized from serotonin (via AANAT and HIOMT enzymes) primarily in the pineal gland, with production tightly controlled by light exposure through the suprachiasmatic nucleus (SCN). Its rhythmic nocturnal secretion is the primary biochemical signal communicating darkness and time-of-day information to the body.

Melatonin acts on MT1 and MT2 G-protein coupled receptors in the SCN, pituitary, and peripheral tissues to synchronize circadian rhythms, promote sleep onset, and regulate seasonal biology. Beyond chronobiology, melatonin is one of the most potent endogenous antioxidants known — directly scavenging free radicals and upregulating antioxidant enzymes (SOD, GPx, catalase). Research also examines its roles in mitochondrial protection, immune modulation, and anti-tumor biology.

• MT1/MT2 receptor pharmacology and circadian rhythm synchronization
• Sleep onset, architecture, and chronobiology research
• Direct free radical scavenging and antioxidant enzyme upregulation
• Mitochondrial membrane protection and oxidative stress models
• Immune modulation and anti-inflammatory cytokine regulation
• Anti-tumor and oncostatic activity research models

Dose levels referenced by the MVLabs peptide calculator, shown for research reference only:

Circadian/antioxidant molecule. Commonly oral; injectable forms are research-only.

Research reference only — not dosing guidance for human use. Use the calculator for other vials or volumes.

Supplied as a lyophilized powder. Store at 2–8 °C on receipt; protect from heat, light and moisture, and avoid excessive agitation. If reconstitution is required for laboratory work, use sterile technique — bacteriostatic water, or 0.6% acetic acid for low-solubility peptides. Protocols vary by research application.