It works for me. I have been low carbing for 3 years but doing guaifenesin for over 5 years. I don't think the short term guai works for me though, but I can tell if I miss a dose. Guai is fairly inexpensive - when I first started taking it, it was a prescription drug, & It was cheap. After it has became OTC & trademarked has the priced gone up so high. I do not believe it is a cure, nor do I believe in the theory behind the protocol, but it does manage the muscle pain that pain relievers do not.