Also, depending on where they are procured (for example, directly from foreign manufacturers or via online influencers affiliate links), they also pose the risk of being inconsistent in terms of dosing and purity, which comes with inherent safety risks
(1990) Prolongation of fibrinolytic activity of tissue plasminogen activator by nitrovasodilators
While not a direct melatonin chronobiotic, kiwifruit seems to exert sleep benefits via a nutritional synergy of antioxidants and serotonin support, and it is a simple dietary addition that may be especially beneficial for older adults who often have insomnia and low antioxidant intake ( Beyond fruits, milk is notable: cows milk obtained from nighttime milking has a higher melatonin content (night milk) compared to daytime milk, since cows, like humans, secrete melatonin at night
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Transition Metal Chemistry 37:127134
But, its important to think about the risks, like problems with blood sugar and too much cell growth