Vitamin B6 Fatemeh Haidari, Majid Mohammadshahi, Mehdi Zarei, Mohammad Hosein Haghighizadeh, Fatemeh Mirzaee (2021)
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Side effects like nausea, reflux, and constipation can show up, especially early on
Another hypothesis relates increased gastrointestinal permeability, probably mediated by the immune system, with ASD onset (Navarro et al., 2015)
More common in the first week or two
Zhaoping Li, professor of medicine and chief of the division of clinical nutrition at the University of California, Los Angeles, tells TODAY.com