The HAP Journal
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The Same Mineral, Sold Into a Completely Different Problem
A hydroxyapatite grade that fails an oral-care specification may be perfectly saleable — to a buyer who measures none of the things oral care measures. Fluoride removal from drinking water is that buyer.
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Complete Occlusion Took Two Ingredients, Not One
Fluoride-free is the most commercially valuable phrase in hydroxyapatite oral care. In the study that produced complete dentinal tubule occlusion, the winning arm contained fluoride.
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Eggshell Against Synthetic Hydroxyapatite, in Actual Jaws
Every argument for eggshell-derived hydroxyapatite is made on the bench — cost, sustainability, trace chemistry. A 2025 clinical study put it in maxillofacial defects alongside the synthetic grade and measured what grew back.
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Five Minutes at 800 Watts: The Eggshell Route That Skips the Furnace
Firing eggshell-derived hydroxyapatite at 900 °C produces a mixture, not a single mineral. A 2024 study asked the obvious follow-up question: what if you never fire it at all?
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171 to 22: What Twenty Minutes in an Autoclave Did to a Qualified Powder
The qualification dossier is signed — particle size, surface area, phase purity, all inside spec. Then the material goes to sterilisation. Two published studies asked whether what comes out is still the material you approved.
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“Meets ISO 13779.” The Standard Says It Does Not Apply to Powder.
A certificate of analysis arrives for a hydroxyapatite powder, and near the bottom sits the line that closes the deal: conforms to ISO 13779. Clause 1 of that standard says something the certificate does not.
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The Datasheet Says Hydroxyapatite. The Diffractogram Says Two Minerals.
Two lots arrive, both labelled eggshell-derived hydroxyapatite, both made at the temperature the literature calls optimal. A published calcination study explains why “optimal” and “pure” were never the same word — and why the certificate you accept decides which one you bought.
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Four Trials Out of Sixty-Eight: What the Hydroxyapatite Evidence Actually Supports
A brand wants “clinically proven to remineralise” on the tube. The literature runs to thousands of papers — but the meta-analysis found only four trials it could use. What does the evidence actually license you to say?
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Two of the World’s Best Measurement Labs Sized the Same Particles — and Got Different Numbers
Japan’s NMIJ and America’s NIST measured the same bottle of reference particles with gold-standard instruments. The numbers disagreed. So what does the particle size on your supplier’s datasheet really mean?
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Nano-Hydroxyapatite Safety: The EU SCCS Opinion and What Brands Need to Know
The EU’s Scientific Committee on Consumer Safety has reviewed nano-hydroxyapatite. Here is what its assessment means for brands using nano grades in cosmetics.