Melatonin: Facts, Extrapolations and Clinical Trials.

Area of Science:

• Endocrinology
• Molecular Biology
• Gerontology

Background:

• Melatonin, discovered in 1958, traditionally functions as a biological time transducer.
• Recent research explores melatonin's hypothesized roles in numerous clinical conditions, often at high doses.
• High-dose melatonin administration is increasingly common in clinical trials, including in vulnerable populations like the elderly and children.

Purpose of the Study:

• To critically review the literature on melatonin's proposed non-receptor-mediated effects.
• To evaluate claims of high-dose melatonin benefits, particularly its potential as a scavenger molecule.
• To distinguish evidence-based findings from unsubstantiated hypotheses in melatonin research.

Main Methods:

• Comprehensive literature review of studies investigating melatonin's effects.
• Critical analysis of experimental evidence supporting hypothesized mechanisms, including antioxidant roles.
• Evaluation of clinical trial data, particularly concerning high-dose melatonin administration.

Main Results:

• Most purported benefits of high-dose melatonin remain hypothetical.
• The experimental evidence supporting these claims is often limited, insufficient, or flawed.
• Melatonin's proposed scavenger functions, especially in mitochondria, require more robust validation.

Conclusions:

• The current evidence does not strongly support widespread claims of high-dose melatonin efficacy.
• Further rigorous research is essential to establish the true therapeutic potential and limitations of melatonin.
• Clinical researchers should approach melatonin studies with critical evaluation to advance the field on a solid scientific basis.