This post discusses the benefits of using Cromolyn Sodium for MCAS. I had been resistant to trying Cromolyn Sodium for a few years because I knew it is expensive, and I wanted to try to heal my MCAS without prescription medications. But after I tried it for the first time I knew it was a game-changer. My constant heartburn evaporated, my hives cleared up, and my brain fog cleared. It can take a while to get up to the full dosage of Cromolyn Sodium, but it can be well worth it!