Yes, NAC is legal to buy, sell, and advertise in Australia. If you have come across conflicting information online, it is almost certainly a mix-up with regulatory news from the United States, which is a completely separate system with its own rules.
Where the Confusion Comes From
A few years ago, the US Food and Drug Administration raised questions about whether NAC could be sold as a dietary supplement there, since it had also been approved decades earlier as a prescription drug ingredient in the US. That created genuine uncertainty for American retailers for a period, and a lot of that confusion spilled over into general online discussion, including among Australian shoppers who saw the headlines without the local context.
Australia has never had that same issue. NAC has a long-established place in the Australian supplement market and is not subject to the dispute that played out in the US.
How Supplements Are Actually Regulated Here
In Australia, supplements and complementary medicines fall under the Therapeutic Goods Administration (TGA). Most listed supplements, including NAC-based products, are entered onto the Australian Register of Therapeutic Goods (ARTG) as "Listed Medicines," identifiable by an AUST L number on the label.
Being listed means the product meets requirements around manufacturing quality, ingredient safety, and label accuracy, though it is a different and less intensive pathway than the "Registered" category used for higher-risk medicines. This is the standard, well-established route most everyday supplements in Australia go through, and NAC products are no exception.
Why This Sometimes Gets Mixed Up With "Banned" Ingredients
Australia does maintain a genuine list of ingredients that are restricted or banned in supplements, and this list gets media coverage from time to time, most recently around ingredients like NMN. Seeing headlines about "banned supplement ingredients in Australia" alongside separate headlines about NAC and the US FDA can easily blur together if you are skimming rather than reading closely. NAC is not on any current Australian restricted ingredient list.
What This Means for You
If you are in Australia and considering a NAC supplement, the regulatory status is not something you need to worry about. It is a legally available, TGA-regulated product category here, with established manufacturing and labelling standards behind it.