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Nutrition and Physical Activity Evaluation Dietary intake of patients was assessed by a dietitian using the 24-h recall method for 3 nonconsecutive days (2 weekdays and 1 weekend) and a Food Frequency Questionnaire [36]

The FDA has determined that NAC is excluded from the statutory definition of a dietary supplement under the Federal Food, Drug, and Cosmetic Act, because NAC was authorized as an active pharmaceutical ingredient (for acetaminophen overdose) before it was widely marketed as a supplement

Approved manufacturers like Eli Lilly and Novo Nordisk invested billions to earn their NDAs and Biologics License Applications (BLAs)

The broader guide on tirzepatide and autoimmune disease provides additional context