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small amounts of melatonin are produced by the retina and lens of the eye, the epithelium of the digestive tract, and blood cells

Di Paola R, Modafferi S, Siracusa R, et al

Circulating tricarboxylic acid (TCA) cycle intermediates and protein damage markers were detected by gas chromatographymass spectrometry (GC/MS)

Pregnant or nursing mothers, children under the age of 18, those taking medication and individuals with a known medical condition should consult a medical professional before taking any food supplement