Some people have issues with MCT, some people have issues with GSO. If your MCT was brewed in China, it likely isn't high quality MCT, and could be mixed with low quality oils, and it would likely have EO/ethyl oleate, which some people react poorly to. Or, you just might not get along well with MCT, and you'll have to avoid it. For people that don't have reactions to MCT, it's nice and thin so it flows easier, more easily suspends higher mg/ml of certain compounds, and has an extended shelf life when compared to most other carrier oils due to being fully saturated. It has a lot going for it, but if you have that much pip from it, it's obviously not the one for you.