Is MSG Bad For Your Health? Subsequent experiments have helped dismantle the MSG-is-bad-for-you theory. For instance, in one study from 1993, researchers tested 71 subjects for reactions to MSG in relation to CRS, concluding that “rigorous and realistic scientific evidence linking the syndrome to MSG could not be found.” In 1999, Katherine Woessner’s team conducted a single-blind, placebo-controlled study to test the effects of MSG on 100 asthmatic patients (an earlier paper suggested that asthmatics with a sensitivity to aspirin might be sensitive to MSG). The researchers found that, while 30 participants believed they had a history of CRS, only one showed signs of reduced lung function after exposure to MSG. When that subject was tested again—this time in a double-blind, placebo-controlled challenge—the test came out negative. https://www.sciencefriday.com/articles/is-msg-bad-for-your-health/