Not for me
The last couple of years I've been averaging 6-12 marathons a year. Recovery drinks are one of the things that seem to make a difference for me. I used R4 (orange flavor) for a while but it always made me excessively gassy and would rack up my stomach for the next couple of hours. I even mixed it in a portable mixer to make sure I didn't have any dry lumps and experimented with watering it down. Nothing worked and I finally gave up on it. I've found my body likes the PowerBar Recovery drink better. No more gas and gurgling after drinking it vs. R4. I believe in the science behind R4, it's just some ingredient they use that doesn't agree with me.