A case occurred in Taiwan where a woman suddenly died from bleeding from all seven orifices. An autopsy determined that she died of arsenic poisoning.
But where did the arsenic come from? The police launched a widespread investigation. A professor from a medical school was invited to assist in solving the case. The professor carefully examined the contents of the deceased's stomach and discovered that the arsenic was produced inside the deceased's body. It turned out that the deceased had been taking "Vitamin C" daily to boost her immune system, which in itself was not a problem. The problem was that she took Vitamin C while also eating a large amount of shrimp.
Researchers discovered through experiments that shrimp and other soft-shelled seafood contain high concentrations of pentavalent arsenic compounds. These substances themselves are not toxic to the human body when ingested. However, when Vitamin C is taken concurrently with shrimp, a chemical reaction occurs, transforming the non-toxic pentavalent arsenic (arsenic anhydride, also known as arsenic pentoxide, with the chemical formula As2O5) into toxic trivalent arsenic (arsenious anhydride, also known as arsenic trioxide, with the chemical formula As2O3), which is what is commonly known as arsenic! Arsenic has a protoplasmic toxic effect, which can paralyze capillaries, inhibit the activity of sulfhydryl enzymes, cause fatty degeneration of the liver and necrosis of the liver lobule center, congestion of the heart, liver, kidneys, and intestines, necrosis of epithelial cells, dilation of capillaries, leading to bleeding from all seven orifices, and ultimately resulting in death from poisoning.
Therefore, as a precaution, one should avoid eating shrimp while taking "Vitamin C".