NMN is not prohibited, yet there are restrictions regarding its sale from within or outside AU. According to the latest information, NMN is in the “gray area” in Australia, meaning it’s not listed on the Australian Register of Therapeutic Goods (ARTG).NMN is not prohibited, yet there are restrictions regarding its sale from within or outside AU. According to the latest information, NMN is in the “gray area” in Australia, meaning it’s not listed on the Australian Register of Therapeutic Goods (ARTG).