I can find a ton of stuff on interactions with medications but I can't find anything on grapefruit/vitamin/supplement interactions. Mostly the grapefruit changes the metabolism of these drugs. It inactivates a common enzyme that works on the drugs. There is some evidence that it can interfer with the active uptake of some drugs, but I didn't find a mention of interfering with nutrients. So I would think that it wouldn't interfer with taking vitamins.



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