CBN vs melatonin: how do they differ?

NCCIH's description of melatonin is the starting point: "Melatonin is a hormone that your brain produces in response to darkness," and it helps regulate the body's circadian rhythm. Supplement melatonin is most often made synthetically. Taking it adds to a signal the body already sends each evening.

Differently, and that drives what a label can say. In the United States melatonin is sold as a dietary supplement, so NCCIH notes FDA regulates it less strictly than prescription or over-the-counter drugs; in several other countries it is prescription-only. CBN inherits the hemp cannabinoid rules: FDA states that THC and CBD products are excluded from the dietary supplement definition, and converted CBN also faces the amended federal hemp definition's exclusion of cannabinoids the plant cannot naturally produce, effective November 12, 2026, with FDA yet to publish the list that would settle CBN's status.

Melatonin has decades of trials and still has open questions. NCCIH cites a 2018 randomized trial of 307 people in which melatonin taken 1 hour before the target bedtime led to falling asleep about 34 minutes earlier, while describing the evidence for jet lag as moderate and for shift work as small or inconclusive. Side effects in adults were mild in a 2015 review. The sharper warnings concern dose and labeling: U.S. sales increased by about 150 percent between 2016 and 2020, a 2023 study found 22 of 25 melatonin gummies inaccurately labeled with contents from 74 to 347 percent of the stated amount, and pediatric poison-control reports rose from 8,337 in 2012 to 52,563 in 2021.

The comparison is uneven in a specific way: melatonin has far more evidence and a known mechanism, while CBN has one head-to-head trial that found parity at 25 to 100 mg. Someone who wants the better-studied option picks melatonin. Someone who has tried melatonin and wants something that works through a different system has one trial's worth of reason to try CBN. Either way, the label-accuracy data cut both ways: melatonin gummies have been measured at 3.5 times their stated dose, and CBN products should carry a certificate of analysis showing actual CBN per piece. Anyone on prescription drugs should ask a pharmacist, since cannabinoids share liver enzyme pathways with many of them.