“[I] gave the wrong link for cancer treatment using melatonin. That link was for Alzheimer and melatonin.
These tests was 25 mg/kg b.w./day for 14 days with 16.2 mg/kg b.w./day × 14 days hexavalent chromium or oxidative version of Chromium. chromium is a known carcinogenic and Melatonin alleviated Cr (VI)-induced damage to male reproductive system and autophagy.
This report says chromium(VI) or hexavalent chromium compounds (calcium chromate, chromium trioxide, or sodium dichromate)”
https://ntp.niehs.nih.gov/ntp/roc/content/profiles/chromiumhexavalentcompounds.pdf
This hexavalent chromium?
“From 1952 to 1966, Pacific Gas and Electric Company (PG&E) dumped about 370 million gallons (1,400 million litres) of chromium-tainted wastewater into unlined wastewater spreading ponds around the town of Hinkley, California, located in the Mojave Desert about 120 miles north-northeast of Los Angeles.[1][2]
PG&E used chromium 6, or hexavalent chromium (a cheap and efficient rust suppressor), in its compressor station for natural-gas transmission pipelines.[1][3] Hexavalent-chromium compounds are genotoxic carcinogens.
In 1993, legal clerk Erin Brockovich began an investigation into the health impacts of the contamination. A class-action lawsuit about the contamination was settled in 1996 for $333 million. In 2008, PG&E settled the last of the cases involved with the Hinkley claims. Since then, the town’s population has dwindled to the point that in 2016 The New York Times described Hinkley as having slowly become a ghost town.[4][5]”
https://en.wikipedia.org/wiki/Hinkley_groundwater_contamination