A chemist went shopping on Amazon and eBay, ran the powders through a lab, and found that roughly three in four were not what the label said. Here is what he did, and what it does and does not tell you.
In August 2024, a chemist named Brett West stood up at the American Chemical Society's autumn meeting in Denver and presented a survey of noni powders bought from Amazon and eBay. He had run them through a chemical analysis method his team built specifically to tell real Morinda citrifolia from everything else being sold under its name. Roughly 73 percent of what he tested was misbranded or simply was not noni.
That number deserves both halves of an honest reading, so let us do the awkward half first.
Who ran this, and what that means
Brett West is Senior Director of Research and Development at Partner.Co, which makes the Tahitian Noni products this shop sells. A company that sells noni published a finding that most competing noni is fake. That is a real conflict of interest and you should weigh it.
It was also a conference presentation rather than a journal article, which means it did not go through peer review. Conference talks are where work is aired before it is fully vetted, and plenty of them never become papers. The ACS session page is public, so the abstract and the schedule can be checked by anyone, which is more than most supplement marketing offers. But checkable is not the same as reviewed.
Why the finding is still worth your attention
Botanical adulteration on open marketplaces is one of the better documented problems in this industry, and it has been studied by people with no product to sell. Independent testing programmes have repeatedly found herbal supplements that contain fillers, the wrong species, or nothing identifiable of the labelled plant at all. A 73 percent failure rate in an obscure tropical fruit powder sold by anonymous third-party sellers is, unfortunately, an entirely ordinary result.
The mechanism is not mysterious either. Noni powder is brown, it is bitter, it has no distinctive appearance in a capsule, and almost no buyer can tell it apart from any other brown botanical powder. An ingredient nobody can identify by sight is an ingredient with very little to stop it being substituted.
What the number does not cover
This is the part most coverage of this finding leaves out. The survey looked at powdered noni products on marketplace listings. The Tahitian Noni sold here is a juice, and it was not part of what was tested. The 73 percent figure says nothing about this product in either direction, and anyone citing it as evidence that this particular bottle is good has misread the study.
What it supports is narrower and more useful: if you are buying noni powder from a marketplace listing with no named manufacturer, the odds that you are getting noni are worse than a coin flip. That is a claim about a category and a sales channel, not a comparison between brands.
What actually protects you
Three things, none of which require trusting anybody's marketing. A named manufacturer with a physical address and a real corporate record, so there is somebody to be accountable. A third-party certification, which means an outside organisation tested the product or audited the plant that made it, and which you can verify with the certifier rather than the seller. And a supply chain the seller will actually describe, including the species and where it was grown.
You can apply those three tests to anything in this shop, or to anything in anybody else's. That is rather the point of listing them.