Toxicology of melatonin

Area of Science:

• Pharmacology
• Toxicology
• Endocrinology

Background:

• Melatonin is widely available over-the-counter in the US, but its toxicology is poorly understood.
• In Europe, melatonin is regulated as a neurohormone, not available OTC.
• Despite widespread use, comprehensive safety data and regulatory approval are lacking.

Purpose of the Study:

• To highlight the lack of toxicological information on melatonin.
• To emphasize the need for preclinical and pharmacological studies for safety evaluation.
• To discuss potential adverse effects based on melatonin's known properties.

Main Methods:

• Review of existing pharmacological and preclinical data on melatonin.
• Analysis of melatonin's circadian and circannual rhythms.
• Consideration of receptor binding and potential intracellular actions.

Main Results:

• Melatonin's secretion patterns and receptor interactions can influence physiological functions.
• Potential adverse effects may involve the central nervous system, cardiovascular system, glucose metabolism, immunology, and cancer.
• High doses or inappropriate timing may lead to deleterious effects.

Conclusions:

• A comprehensive drug toxicological file for melatonin is necessary.
• Safety evaluation requires considering its unique properties as a neurohormone.
• Further research is crucial for risk assessment and safe use of melatonin.