Pistachios are a rare plant-based food source containing significant amounts of natural melatonin, a hormone regulating sleep-wake cycles. Studies show they provide around 660 nanograms per gram, aiding in sleep quality. Eating roughly one ounce of shelled pistachios about an hour before bed may help improve sleep. [1, 2]
- Melatonin Levels: Research indicates a high level of melatonin (about \(660\ \text{ng/g}\)) in American-grown pistachios. Another, higher estimate suggests they contain \(230\ \mu\text{g/g}\), though this varies by study.
- Sleep Benefits: Because they contain tryptophan, an essential amino acid, they can help relax the body and aid in better sleep quality.
- Roasting Effects: The melatonin content remains stable even when pistachios are roasted.
- Additional Nutrients: Beyond melatonin, they are rich in vitamin B6, which helps convert tryptophan into serotonin and melatonin. [1, 2, 3, 4, 5]
