“…Results suggest that MEL treatment or PG prevent agerelated thymus involution through regulation of thymocyte apoptosis which, in turn, occurs through modulation of the pituitary-adrenal axis and zinc turnover determined by the pineal hormone 231 . Studies have found melatonin useful in cocaine abuse 232 , seasonal affective disorder 233,234 , delirium 235 , headache 236,237 , gallstone 238,239 , and amyotrophic lateral sclerosis 240 . Few studies have suggested melatonin as an effective radioprotective agent [241][242][243][244][245] .…”