This may be a stupid question, but here goes nothing.
I'm currently taking winny at 50mg/day split into 2 doses 8 hours apart. I take my first dose upon waking with 8oz of grapefruit juice, due to its obvious effects on bio-availability.
Now, my question is; does grapefruit extract behave the same way? Could I substitute the 8oz of juice for a few pills and save myself 90 calories of pure sugar? If so, how many mgs of extract would be equivalent to 250ml (8oz) of grapefruit juice.