seafood is often enriched with arsenic because of its water quality. Originally, pentavalent arsenic is less toxic, but if it is reduced to trivalent arsenic by a reducing agent such as vitamin C, that is, arsenic (arsenic trioxide), the toxicity rises sharply, so there is a danger of poisoning. Theoretically, high-dose vitamin C (more than 5mg of vitamin C is ingested at one time) and pentavalent arsenic will be transformed into toxic trivalent arsenic (that is, arsenic) through complex chemical reactions, which can lead to human poisoning when the trivalent arsenic reaches a certain dose. (This passage is quoted from seafood+vitamin C= arsenic? _ diet hot spot)
But in fact, the content of vitamin C in fruit juice is generally not enough to cause a toxic chemical reaction, so it is not a big problem to drink one or two cups. However, some friends have personally experienced that eating seafood (especially shrimp) and then eating a vitamin C concentrated tablet is really mild.