The study and its comparison
Thirty physically active men and thirty women were randomized to melatonin or placebo before a resistance-exercise session. Blood sampling continued before and for two hours after exercise. [1]
Selected growth-hormone responses favored melatonin in men, with some accompanying somatostatin changes. IGF-1 did not significantly differ. The study focused on short-term hormone measurements. [1]
What the finding establishes
These findings do not establish increased height, muscle growth or improved training adaptation. Sex-specific observations should not be generalized to everyone. Funding and conflicts were not established from the abstract. The research doses describe an experiment; they do not provide a bodybuilding regimen. A hormone response can be brief and need not predict a lasting physical change. [1]
A hypothetical distinction
Imagine a hormone peaks for an hour. Demonstrating larger muscles would require a longer study that measures them.
| Detail | Interpretation |
|---|---|
| Measured outcome | Keep the endpoint specific |
| Study preparation | Not every retail product |
| Remaining uncertainty | Not resolved by a mechanism |
Sources for this article
- Effects of a single dose of N-Acetyl-5-methoxytryptamine (Melatonin) and resistance exercise on the growth hormone/IGF-1 axis in young males and females.
Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.