The unregulated scale of the supplement industry, in one staged photograph.
U.S. Air Force photo illustration by Airman 1st Class Daniel Brosam
Illustrative: a staged U.S. Air Force public affairs photograph about the dietary supplement industry generally, not a photograph of NMN, NAD+, or any product named in this story.
A Regulator Finally Put Numbers on NMN: 500 Milligrams, 12 Weeks, Oral Only
I have written about NAD+ and NMN before, mostly to point out that the measurement side of the category is shakier than the marketing suggests. This week a real regulator did something no US agency has done. It put actual numbers on the table, a maximum dose, a stopping point, and a rule about what a bottle is allowed to say about itself.
- Australia's Therapeutic Goods Administration made NMN a permitted ingredient on December 10, 2025, but only under strict conditions, oral only, a maximum of 500 milligrams a day, 12 weeks or less, and adults only, not in pregnancy or while breastfeeding.
- A compositional guideline published alongside the decision defines what NMN must actually be, its identity, purity, assay range, impurities, and required testing.
- NAD, NAD+, and NADH themselves remain not permitted in Australian complementary medicines, and the regulator warns that using those terms in a product's name, label, or advertising risks breaching the law, even when the wording only implies the product contains NAD+.
- US NMN bottles routinely list 250 to 1000 milligrams or more with no duration guidance at all, and nothing about this Australian decision changes what is legal to sell in the United States.
What Australia's regulator actually decided
Australia's Therapeutic Goods Administration added nicotinamide mononucleotide, NMN, to its Permissible Ingredients Determination on December 10, 2025. That sounds like a green light, and in one sense it is, NMN is now an explicitly permitted active ingredient in Australian complementary medicines for the first time. But the permission came with conditions attached. It has to be taken orally, a restriction that holds until December 10, 2027. The maximum daily dose is 500 milligrams. It can only be used for 12 weeks or less at a time. And it is restricted to adults, with an explicit exclusion for pregnancy and lactation.
Alongside the determination, the TGA published a compositional guideline, the part with real teeth. It defines what NMN has to actually be to count, its identity, its purity, the range its assay has to fall within, allowable impurities, and the testing required to prove all of that. In other words, a regulator has now written down a checkable definition of real NMN, not just a permission to sell something called NMN.
The label the industry cannot use
Here is the part that cuts the other way. NAD, NAD+, and NADH themselves remain not permitted ingredients in Australian complementary medicines. Separately, the TGA has warned that listed medicines making NAD, NAD+, or NADH representations, through the product name, the label, or the advertising, are at risk of breaching the law, particularly where the wording merely implies the product contains NAD+. So even a product that legitimately contains NMN cannot legally wrap itself in NAD+ language on the front of the bottle.
That is a label literacy lesson worth carrying with you past Australia's borders. Seeing NAD+ printed on a product's front label is not the same as that product containing NAD+. A regulator has now said so explicitly, and the question worth asking before buying anything in this category is simple, which molecule is actually inside, and how many milligrams of it.
Honest caveat
This is Australian regulation, and it does not bind US sellers. A US reader's NMN bottle is legal at 1000 milligrams a day with no duration limit, and nothing here changes that. The TGA's limits are a regulatory risk judgment, not the output of a dose ranging clinical trial, 500 milligrams a day is a cautious administrative ceiling, and it should not be read as science declaring that the optimal dose, or as evidence that higher doses are harmful. Permitting NMN is also not the same as the TGA endorsing that NMN works, permissibility and efficacy are separate questions, and this determination only speaks to the first. The naming restriction is about misleading representation, not about NAD+ being unsafe. And this is a standing regulatory condition currently in force rather than a single news event, the determination dates to December 2025 and the trade reporting that surfaced it runs through August 2026, so it is best read as reference material rather than breaking news.
What this means for you
Two things here are genuinely usable if you take NMN or are thinking about it. First, you now have an actual regulator's dose and duration ceiling to hold up against a US bottle, 500 milligrams a day, 12 weeks or less. Most US NMN products list a dose somewhere in that range or higher and simply never mention a stopping point at all, which is worth noticing on its own. Second, you have a real label literacy tool, a product can legally contain NMN and still not be allowed to call itself an NAD+ booster in Australia, because the two molecules are not the same thing and a regulator has said the naming is misleading. Before buying anything in this category, ask which molecule is actually in the bottle and how many milligrams of it you are getting. That question cuts through most of the marketing on its own.
Primary sources
- Therapeutic Goods Administration. NAD, NAD+, NADH or NMN medicines sold in Australia (safety alert).
- Therapeutic Goods Administration. Making NAD, NAD+, NADH or NMN representations for listed medicines (guidance).
- NutraIngredients. NAD, NAD+, NADH not allowed in complementary medicines, naming TGA. August 26, 2026.
- ChemLinked. Australia's TGA reiterates NMN as illegal ingredient (independent regulatory summary).
Common questions
Does this mean NMN is illegal in Australia?
No. Instead of banning it, the TGA made NMN an explicitly permitted ingredient for the first time, on December 10, 2025. What is not allowed is selling it outside the conditions attached, more than 500 milligrams a day, for longer than 12 weeks, by any route other than oral, or to anyone who is pregnant, breastfeeding, or under 18.
Can I still buy an NAD+ supplement in Australia?
Not one containing NAD, NAD+, or NADH themselves, those remain not permitted as ingredients in Australian complementary medicines. Separately, even a legitimate NMN product cannot legally use NAD+ language in its name, label, or advertising if that wording implies the product contains NAD+.
Does the TGA's 500 milligram limit mean that is the correct dose to take?
No. The TGA has described this as a cautious regulatory ceiling, not the output of a dose finding clinical trial. It tells you what a regulator judged an acceptable risk boundary, not what dose actually works best. Nobody, including the TGA, has established an optimal human dose for NMN.
Stay Curious.
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