Unfortunately, a very well known anti-oxidant and healing supplement known as NAC may be banned from Amazon.
[The] FDA has concluded that NAC products are excluded from the dietary supplement definition under section 201(ff)(3)(B)(i) of the Act [21 U.S.C. § 321(ff)(3)(B)(i)]. Under this provision, if an article (such as NAC) has been approved as a new drug under section 505 of the Act [21 U.S.C. § 355], then products containing that article are outside the definition of a dietary supplement, unless before such approval that article was marketed as a dietary supplement or as a food. NAC was approved as a new drug under section 505 of the Act [21 U.S.C. § 355] on September 14, 1963.
Since then several retailers have dropped NAC and NAC containing products. Currently Amazon is slowly taking down NAC listings.
As per the notification from Amazon:
This product has been identified as containing the drug-only active ingredient N-ACETYL-L-CYSTEINE (NAC). Amazon policy prohibits the sale or listing of dietary supplements that contain drug-only active ingredients.