They seems to have banned products claiming to cure hangovers https://www.fda.gov/food/cfsan-constituent-updates/fda-sends-warning-letters-seven-companies-illeg

They seems to have banned products claiming to cure hangovers https://www.fda.gov/food/cfsan-constituent-updates/fda-sends-warning-letters-seven-companies-illegally-selling-hangover-products https://www.fda.gov/food/cfsan-constituent-updates/fda-sends... but Nac is still available. Amazon had an overly broad interpretation of those letters but it appears to be available there : https://www.iherb.com/pr/Now-Foods-NAC-600-mg-250-Veggie-Caps/694 https://www.iherb.com/pr/Now-Foods-NAC-600-mg-250-Veggie-Cap...