Melatonin is believed to be responsible for the synchrony of circadian rhythm, modulating sleep patterns with day and night.

Melatonin is an antioxidant and protects tissues from oxidative damage byfree radical elements. Further more, melatonin induces synthesis of endigenous antioxidants such as superoxide dismtase (SOD).

Several researches indicate that melatonin protects the gastrointestinal tract from irritation, reduces stress-induced lesion formation and heals ulcer.

Below are lists containing natural plant sources of melatonin. Melatonin content is in nanogram (ng) per gram of plant sample.

Table 1:

Table 2: