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Gut dysbiosis may thus result in deficiencies of critical micronutrients, notably iodine, selenium, iron, zinc, and vitamin D, which are indispensable for optimal thyroid function and regulation (Knezevic et al., 2020)

L-cysteine is usually the amino acid thats in shortest supply for making glutamine, so its important that you get enough of this amino acid, even though its not considered essential

312 A growing body of evidence suggests getting adequate sunlight, whether outdoors or through windows, during the day may be more important than artificial light exposure at night for circadian and sleep health

This is the glutamineglutamate (GABA) cycle