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Here is a link to the study :
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8123278/
Here is a relevant quote from the study that explains 3 more ways to get significantly increased melatonin levels without taking a melatonin supplement :
>>> ' Volunteers were given juice extracted from 1 kg of orange or pineapple or two whole bananas, containing 302, 150, and 8.9 ng phytomelatonin, respectively. The study demonstrated that the serum melatonin concentration was significantly increased after 120 min of fruit consumption. For pineapple (146 versus 48 pg/mL p = 0.002), orange (151 versus 40 pg/mL, p = 0.005), and banana (140 versus 32 pg/mL, p = 0.008), and this definitely proves that fruits are a good source of phytomelatonin. Besides, the antioxidant capacity in the serum also markedly increased, suggested by the significant increases in two indicators; ferric reducing antioxidant power assay and oxygen radical antioxidant capacity [35]. Likewise, a study conducted with young, middle-aged, and elderly participants showed that the ingestion of 200 mL of grape juice twice a day increased urinary 6-sulfatoxymelatonin, a major metabolite of melatonin commonly used as a biomarker, and total antioxidant capacity in the all three groups of individuals [36 ' <<<
So now we know that fresh orange and pineapple juice as well as bananas or grape juice can significantly increase melatonin levels in humans. In the case of fresh orange juice, a greater than 3x increase in the melatonin level was seen. So in total, we now have 5 ways to very significantly increase melatonin levels without the side effects reported for melatonin supplements! I'll drink to that....orange juice, that is!
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