I never did liquid. Gee I hope it is working for you.
I don't know exactly what Grapefruit-Seed-Extract does but I do know that it is an inhbitor of the CYP450 3A enzyme. There are many drugs including antifungals that inhibit this enzyme.
When I can afford it I buy it. When things were really bad and I was very down and had no clue what to do or take many years ago, I finally reached for this and guess what happened.
I spilled the whole bottle on the kitchen floor!
That was my sign that I better take it. See, I used to be the type that I would not ever consider taking something that had fallen on the floor - not even for 5 seconds but with my horrible luck I knew that this must be something I needed or it would not have fallen.
If it weren't for Bad Luck I would not have any Luck at all!
Make sure you keep your salt or electrolytes up. I used to do about a half teaspoon of baking soda or Sea Salt with a half glass of water and chug it quick. Sometimes do another a little later and it helped me. But that was me, I am not advising. I am not a doctor, I am just sharing.