any anti-estrogen will work for PCT, whether it's ATD, Novedex XT by Gn, Nolvadex, Clomid, Arimidex, Aromasin, Formestane, Letrozole, 6-oxo, etc etc.
OTC anti-e's tend to have issues with bioavailability and elimination, meaning they don't stay around in the bloodstream very long so you might...