Phytomelatonin is melatonin produced by plants. It is chemically identical to the melatonin your body makes and to the synthetic version sold as a supplement. All three share the same molecular structure: N-acetyl-5-methoxytryptamine, a small molecule derived from the amino acid tryptophan. The difference is purely the source, not the substance.
Why Plants Make Melatonin
Melatonin is one of the oldest molecules in biology, dating back roughly 2.5 to 3 billion years. It likely first appeared in ancient bacteria, long before plants or animals existed. Its original job was simple: neutralizing free radicals, the unstable molecules that damage cells during normal metabolism and photosynthesis. When early bacteria were eventually absorbed into the cells of more complex organisms (a process called endosymbiosis), melatonin came along for the ride. That’s why it shows up across nearly every kingdom of life today.
In plants, phytomelatonin still serves that core protective role, but it has picked up many others over billions of years of evolution. It promotes seed germination, stimulates root growth, and supports photosynthesis by slowing the breakdown of chlorophyll. It also acts as a stress shield. Plants treated with phytomelatonin show improved tolerance to drought, extreme cold, heat, salt exposure, and heavy metal contamination. During cold stress, for example, it boosts the production of protective compounds like proline and sucrose. In tomatoes under heat stress, it increases chlorophyll content and enhances the activity of enzymes central to photosynthesis. It even regulates stomata, the tiny pores on leaves that control gas exchange and water loss.
Think of phytomelatonin as a plant’s all-purpose defense and growth molecule. It scavenges the harmful reactive oxygen species that accumulate when a plant is under environmental pressure, protecting DNA, proteins, and cell membranes from damage.
Foods That Contain It
Nearly all plants produce some melatonin, but concentrations vary enormously. Pistachios stand in a category of their own, with roughly 230,000 nanograms per gram of dry weight across multiple cultivars. That’s far higher than any other commonly eaten food. Cranberries come in second at around 96,000 nanograms per gram. After that, the numbers drop significantly:
- Coffee (roasted arabica beans): about 9,600 ng/g
- Certain wild mushrooms (saffron milk cap): about 12,900 ng/g
- Porcini mushrooms: about 6,800 ng/g
- Common button mushrooms: 4,300 to 6,400 ng/g
- St. John’s wort flowers: about 4,490 ng/g
These numbers are measured in dried weight, so the concentration in fresh food would be lower. Still, eating melatonin-rich foods does raise melatonin levels in the blood. One comparison in rats found that synthetic melatonin raised plasma levels only about 17% more than melatonin from bean sprouts, suggesting plant-derived melatonin absorbs reasonably well.
Phytomelatonin vs. Synthetic Melatonin
When researchers compare phytomelatonin powder to synthetic melatonin using mass spectrometry (a method that identifies molecules by their exact structure), the two produce identical results. They trigger the same physiological responses in lab and animal studies. There is no structural or functional difference between them.
The practical distinction is what comes along with the melatonin. A synthetic supplement contains pure melatonin and whatever inactive ingredients the manufacturer adds. A phytomelatonin extract contains melatonin plus other plant compounds, including various antioxidants, that may work alongside it. Some supplement brands market this as a “melatonin complex,” though research directly comparing real-world health outcomes between plant-extracted and synthetic melatonin in humans is still limited.
How Melatonin Works in the Human Body
Whether it comes from a plant, a pill, or your own pineal gland, melatonin acts the same way once it enters your bloodstream. Its most familiar role is regulating your sleep-wake cycle: levels rise in the evening, peak during the night, and drop by morning. But melatonin also functions as an antioxidant throughout the body, and it influences inflammation. It has been shown to reduce key inflammatory markers, with dosages below 25 mg per day lowering levels of C-reactive protein, TNF-alpha, and IL-6, all signals of systemic inflammation.
This anti-inflammatory effect has drawn interest in contexts beyond sleep, including post-surgical recovery and chronic inflammatory conditions. During the COVID-19 pandemic, melatonin was studied as a supportive treatment, with some patients showing reduced symptom severity, though it was never established as a primary therapy.
Safety and Dosage
The optimal dose of melatonin, regardless of source, is not firmly established. Dosages in studies range widely. The current evidence suggests that low to moderate doses, roughly 5 to 6 mg daily or less, appear safe for most adults. Short-term side effects are minimal and typically resolve when you stop taking it. Long-term studies, including one averaging over seven years of use, have found few adverse effects and no development of tolerance.
There are a few specific considerations. In older adults, a single dose can temporarily affect balance, which matters for fall risk. People with restless legs syndrome may notice worsened motor symptoms. Higher doses (above 2 mg) of sustained-release formulations can keep blood melatonin elevated for around 10 hours, which sometimes extends beyond a normal sleep window in older adults. In children with neurodevelopmental conditions, long-term use has been studied for nearly four years with no evidence of tolerance or serious adverse effects, though some researchers have flagged a possible association with delayed puberty onset that remains unconfirmed.
Because phytomelatonin is molecularly identical to synthetic melatonin, these safety findings apply equally to both forms. The source of the molecule does not change how your body processes or responds to it.