Hydroxyapatite

Same mineral · Source is a process fact

Eggshell hydroxyapatite.

Quick answer

Eggshell hydroxyapatite starts as eggshell calcium, usually calcium carbonate, and is converted into hydroxyapatite. Synthetic hydroxyapatite starts from laboratory calcium and phosphate salts. The finished crystal is the same mineral family either way: Ca₁₀(PO₄)₆(OH)₂.

The ingredient name "hydroxyapatite" does not tell you which route a brand used. Klyyr One+ lists hydroxyapatite (nano and micro). The ingredient list does not say eggshell, egg membrane, or any animal source.

  • 01

    Same mineral, different kitchen

    Eggshell calcium can be processed into hydroxyapatite. So can pure calcium and phosphate salts. The crystal you end up with is hydroxyapatite if the process did its job.

  • 02

    Source does not set the spec

    Particle size, shape, coating, purity, and heavy metals are process outcomes. "From eggshells" does not answer them.

  • 03

    One+ does not claim an eggshell

    The label says hydroxyapatite (nano and micro). If a brand uses eggshells, that fact belongs on their spec sheet, not as an assumption about every tube.

Question Either source What it settles Klyyr One+ What the label says
Finished mineral Hydroxyapatite, if conversion is complete Listed as hydroxyapatite
Eggshell starting point Mostly calcium carbonate Not listed
Lab salts Calcium and phosphate reagents Not stated on the ingredient list
Particle size Nano or micro, set by the process Both disclosed
Egg allergy A question for any product that actually contains egg protein No egg ingredient on the list
Purity Depends on testing, not on the origin story Ask for a spec. The word eggshell is not one
EU nano rules Rod-shaped, uncoated, concentration cap A safety spec, not a feedstock spec

EU nano-hydroxyapatite rules apply to specified particle characteristics, not to the word eggshell. One+ does not publish an eggshell or synthetic feedstock claim. Compare brands on the written spec, not on the story.

Sources behind this answer

Safety opinions describe a specified material. They do not award points for eggshells.

  1. Regulation (EU) 2024/858 · EUR-Lex

    Nano-hydroxyapatite restriction

    The EU rule limits nano-hydroxyapatite in toothpaste by concentration and particle characteristics. It does not mention eggshells. The regulated object is the material, not the story of where the calcium began.

    Read Regulation (EU) 2024/858

  2. EU Scientific Committee on Consumer Safety · June 2025

    Hydroxyapatite (nano), Submission IV

    The opinion covers a specified nano-hydroxyapatite. A safety conclusion for one characterized material does not transfer to every eggshell-derived powder.

    Read the 2025 SCCS opinion

  3. Current Klyyr label

    One+ formula facts

    One+ lists hydroxyapatite (nano and micro) in a 16-ingredient formula. Egg, eggshell, and egg membrane are not on that list.

    Read the One+ product page

How to choose

If a brand leads with eggshells

Ask for particle size, whether it is nano, the percentage, and a contaminant spec. The shell is the start of the process. The spec is the product.

If you have an egg allergy

Hydroxyapatite made from eggshell is not automatically egg protein, and it is not automatically free of it. Use the brand's allergen statement and your clinician. One+ does not list an egg ingredient.

If you want the mineral, not the origin story

Read "hydroxyapatite," the percent if they print one, and nano or micro. One+ prints 10% combined nano and micro.

The Klyyr One+ formula

One+ is fluoride-free toothpaste with a clearly disclosed 10% nano + micro hydroxyapatite blend, 16 listed ingredients, peppermint + spearmint, no SLS, and no artificial dyes.

  • 01

    10% hydroxyapatite

    Combined nano + micro hydroxyapatite, disclosed on the label. Ten percent is not a universal efficacy threshold.

  • 02

    16 listed ingredients

    Water, Sorbitol, Glycerin, Potassium Sorbate, Hydroxyapatite (nano & micro), Xylitol, Sodium Cocoyl Glutamate, Cellulose Gum, Xanthan Gum, Zinc Citrate, Aloe Vera, Mentha Piperita (Peppermint) Oil, Mentha Viridis (Spearmint) Leaf Oil, Menthol, Sodium Benzoate, Stevia Rebaudiana Leaf/Stem Extract.

  • 03

    What is not in it

    0 ppm fluoride. No SLS. No artificial dyes. Sodium cocoyl glutamate is the surfactant.

  • 04

    120 g aluminum tube

    4.23 oz, approximately 90 brushings. Aluminum tube, HDPE cap. Recycle where accepted locally.

In short

Eggshell is a calcium source, not a result. One+ names the mineral and the two size ranges. It does not name an eggshell.

01 Is eggshell hydroxyapatite better?

Better at what? The finished mineral can be the same. Particle size, purity, and the rest of the toothpaste decide the product. The eggshell does not.

02 Is eggshell hydroxyapatite natural?

Eggshell is a natural calcium source. Turning it into hydroxyapatite is a chemical process. "Natural" does not appear on a spec sheet as a number.

03 Does One+ use eggshells?

The ingredient list does not say so. It lists hydroxyapatite (nano and micro), with no egg ingredient.

04 Can I use eggshell hydroxyapatite if I am allergic to eggs?

Ask the brand whether any egg protein remains, and ask your clinician. Do not infer safety from the word hydroxyapatite.

Read the full FAQ →

Shop

One tube. Pick the question you came with.

One+ is the only product in each collection. Pick the page that matches what you came for.

  1. 01 Nano-hydroxyapatite toothpasteSize, disclosed.
  2. 02 Family hydroxyapatite toothpasteOne formula, not a separate kids source story.
  3. 03 10% hydroxyapatite toothpasteThe percent One+ prints.
ONE+
Hydroxyapatite, named. Source, not claimed.
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