請問天山老師，剛看到有一位外國人他這樣說glynac： Try only using Glycine, NAC is known to be intolerant for some people and can cause the same effects as histamine sensitivity. NAC also interferes with glutathione and therefore can decrease dopamine and alter serotonin levels. I would only use NAC when you need extra focus ore something. personally also do not use it anymore because it gives me anhedonia. 不知他說法對嗎？
