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Q. I bought orange juice and saw that next to the certification logo there is an "F". Does that mean "fleishig" or "fish" or something else? Please advise.
A. The "F" refers to "fish". As a rule, a fish designation means that you cannot eat that food with meat, but in this case, we happen to know that it is not true. That hashgacha labels the orange juice as "fish" because it contains a tiny bit of fish oil in it, and they take the position that fish ingredients cannot be batel. However, Rav Gedalia Dov Schwartz, zt"l has said that fish can be batel b'shishim (and other hashgachos take a similar stance), and, therefore, we would say that it can be used with meat despite the fish ingredient.