Large doses of oral vitamin C and a large number of seafood products will cause chemical reactions, especially seafood contains arsenic, under certain conditions of reaction to generate arsenic, can cause poisoning, but the normal intake rarely causes poisoning, usually oral vitamin C tablets is also within the normal range, plus the country has strict requirements for seafood, the detection of arsenic failed products can not be sold, so vitamin C and seafood products together will not cause poisoning. C and seafood products eaten together will not cause poisoning. Eating seafood products may cause allergies or digestive tract reactions, diarrhea, abdominal pain, etc. In order to reduce the occurrence of diarrhea and abdominal pain, it is recommended to eat seafood and vitamin C tablets separately, at least 2 hours apart, so that the drug has been metabolized and absorbed when eating seafood, reducing the time to meet in the stomach, can avoid reactions, safer.