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Eggshell Calcium

$18.00
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Jan 30, 2026: We have received the next batch of eggshell calcium, but the yeast lab results came back a bit high (2,100 cfu/g). We heat sterilized it and sent another sample off to the labs for follow-up testing. If the results are acceptable, we should have more in stock by mid Feb 2026. Thank you for your patience!

Sep 18, 2025: BUYER BEWRE: We want to be up front, our eggshell calcium has a distinct smell that you may not find enjoyable.

We are currently shipping 125 g Eggshell Calcium with the following info:

Serial Numbers (s/n)
& Date Range Sold
Lab Results & Info
H0027 - onward

Feb 6, 2026 - onward

Eggshell Powder:

  • Date received: Jan 12, 2026
  • Made in: China (why China?)
  • Purity COA (pdf*)
  • Calcium: 40%
  • Metals/Non-Metals COA (pdf, pdf)
  • Aluminum: 0.26 ppm
  • Arsenic: < 0.10 ppm
  • Cadmium: < 0.10 ppm
  • Chromium:  0.11 ppm
  • Fluoride: < 5 ppm
  • Lead: < 0.10 ppm
  • Mercury: < 0.05 ppm
  • Nickel: < 0.10 ppm
  • Microbials COA* (pdf)
  • *our initial COA had some microbial levels that were out of range. we heat sterilized the eggshells and re-tested. see the initial COA (pdf).
  • Aerobic: 1,800 cfu/g
  • Coliform:< 10 cfu/g
  • E. coli: < 10 cfu/g
  • Salmonella: negative
  • Mold: < 10 cfu/g
  • Yeast: < 10 cfu/g
  • Particle Size (pdf)
  • Average: 17.50 µm
Bottle & Cap:
  • Bottle material: amber glass
  • Cap/seal: phenolic plastic cap and LDPE cone liner
  • Made in: USA
See all COAs.

We are currently shipping 400 g Eggshell Calcium with the following info:

Serial Numbers (s/n)
& Date Range Sold
Lab Results & Info
G0076 - onward

Feb 6, 2026 - onward

Eggshell Powder:

  • Date received: Jan 12, 2026
  • Made in: China (why China?)
  • Purity COA (pdf*)
  • Calcium: 40%
  • Metals/Non-Metals COA (pdf, pdf)
  • Aluminum: 0.26 ppm
  • Arsenic: < 0.10 ppm
  • Cadmium: < 0.10 ppm
  • Chromium:  0.11 ppm
  • Fluoride: < 5 ppm
  • Lead: < 0.10 ppm
  • Mercury: < 0.05 ppm
  • Nickel: < 0.10 ppm
  • Microbials COA* (pdf)
  • *our initial COA had some microbial levels that were out of range. we heat sterilized the eggshells and re-tested. see the initial COA (pdf).
  • Aerobic: 1,800 cfu/g
  • Coliform:< 10 cfu/g
  • E. coli: < 10 cfu/g
  • Salmonella: negative
  • Mold: < 10 cfu/g
  • Yeast: < 10 cfu/g
  • Particle Size (pdf)
  • Average: 17.50 µm
Bottle & Cap:
  • Bottle material: amber glass
  • Cap/seal: polypropylene cap and F217 foam liner
  • Made in: USA
See all COAs.

Specifications:

  • Ingredients: Jet-milled eggshell calcium powder.
  • Excipients: None.
  • Country of Origin: See table above.
  • Certificate of Analysis (COA) available online with every order (why the COA? | view COAs)
  • Bottled in an amber glass jar for protection from UV light (why amber?)
    • See table above for bottle components' country of origin.
    • 125 g Bottle
      • Dimensions: 2 1/16 x 3 7/8 in (53 x 98 mm) (diameter x height)
      • Total weight: 9 oz (255 g)
    • 400 g Bottle
      • Dimensions: 3-5/8 x 3-13/16 in (92 x 97 mm) (diameter x height).
      • Total weight: 25 oz (710 g).

Optional scoops:

  • 0.5 ml Plastic Scoop
    • Holds roughly ~0.65 g per loose/unpacked level scoop, or ~260 mg of elemental calcium.
    • Please wash/sterilize before use!
    • Made in China (why China?).
    • Length: 3.75 in (95 mm).
    • Weight: 0.04 oz (1.1 g).
  • 1 ml Plastic Scoop
    • Holds roughly ~1.3 g per loose/unpacked level scoop, or ~520 mg of elemental calcium.
    • Please wash/sterilize before use!
    • Made in China (why China?).
    • Length: 3.75 in (95 mm).
    • Weight: 0.04 oz (1.1 g).

Disclosures (updated Dec 20, 2024):

  1. We use glass containers for storage and packaging, although caps and seals are usually made from silicone, plastic, rubber, or LDPE.
  2. We use amber colored glass or wrap clear glass to block UV rays from reaching contents.
  3. We store bulk powder sealed in the freezer.
  4. We store EVOO at room temperature (74 - 78°F or 23.3 - 25.6°C) away from sunlight.
  5. We steam sterilize all glass bottles, containers, caps, liners, and utensils before using them for storage or bottling using distilled water.
  6. We prioritize the material of all containers and utensils that come into contact with product in this order: glass, ceramic, stainless steel, plastic, aluminum.
  7. Bulk powder we receive is usually stored in an aluminum or plastic container. We immediately weigh and move it to a glass container.
  8. More information about our process here.
  9. Please also review our Terms and Conditions before placing an order.

Are we missing something that you'd like to see? Let us know!

10 Reviews Hide Reviews Show Reviews

  • 5
    Bravo!

    Posted by Alex Speiser on Sep 27th 2025

    All of lark's stuff is awesome. It's cool to see them come out with new stuff. This one felt special in the glass jar. The eggs are so finely ground. We really like this stuff in my family. Grateful to utilize these products!