I have recently been diagnosed with hyperparathyroidism. This has been ongoing for 2 years but finally have an answer. The brain fog started in late May and is frustrating as a teacher who tutors and teaches a STEM camp during the summer and I have been messing up schedules the last several weeks. I have been searching for solutions and a friend just found NAC listed as an option for Covid Brain Fog and I just ordered this and will try to see if it lifts Hyperparathyroidism Brain Fog. I am hopeful as surgery won’t happen for about 3 months.