and see how that goes? You said you used grapefruit with the oo last time and it was OK.
**BUT**: If you still feel bad from the grapefruit juice right now (or have a gut instinct that you shouldn't take greapfruit juice again), then just go with the lemon. That sounds like common sense.
I honestly don't know why it has to be fresh citrus (instead of maybe fresh-frozen). But that's what everyone seems to agree on still.
I believe the first concern is to not get yourself sick.