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2021 doi: 10.1016/j.sajb.2021.11.020

It works over a wide pH range and is used between 0.5-1.2%

The FDA also notes that available clinical data are limited
However, a large group notices fatigue that accumulates faster than it should, sleep that degrades when a phone is on the nightstand, and headaches that improve suspiciously when they travel somewhere remote
