Review of Natural Grapefruit-WF:

It is grapefruit... a flavor I love, but with too much pith.  GF is supposed to be astringent, but not this bitter.  

If you use this for an obvious GF flavor do NOT let it sit bc after  2-3 weeks the GF is gone, leaving only this sharpness thats hard to describe, almost chemical.. 

But the one thing I did learn by accident, is if you've ever found some tropicals "over ripe"  "musty" or even cat-pee-adjacent  (im talking to you cap sweet mango and WF passion) this, oddly, at a couple 2 drops per 10ml, will knock that down and give you a beautiful clean bright finish to tropicals that you might not enjoy otherwise.