The problem is that they cost too much and widespread coverage would indeed be very high
& Richardson, C
Israel Chaikoff, an observation now known as the Wolff-Chaikoff effect ( 3 and T 4 , this effect acts to block the excessive amounts of iodide in the body from generating large amounts of thyroid hormone ( However, the Wolff-Chaikoff effect is transient, usually lasting only one to two days, after which an escape occurs where regular synthesis of thyroid hormones resumes ( Notably, excess amounts of daily iodide ranging from 30 mg to 2 g are typically well tolerated in individuals with normal thyroid glands
Healing tissue needs new microvasculature, and the body builds it slowly without help
Or maybe its because NAC can help with glutamate in the brain (neurotransmitter)
Comhair SA, Ricci KS, Arroliga M, Lara AR, Dweik RA, et al: Correlation of systemic superoxide dismutase deficiency to airflow obstruction in asthma