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4.9
Rated 4.9 out of 5 stars
7 Reviews

Layer Calcium

supplement • laying hens

  • Layer Calcium
  • Layer Calcium
  • Layer Calcium
  • Layer Calcium
4.9
Rated 4.9 out of 5 stars
7 Reviews

Layer Calcium

supplement • laying hens

Layer Calcium is an essential calcium supplement for strong eggshells and healthy, productive hens. This all-natural, carbon-negative supplement was consciously formulated to put your flock and the planet first. 

Size: 5 lb.

Essential source of calcium for strong eggshells & healthy bone, muscle, and nerve development Made with naturally occurring aragonite, the most efficient calcium source available for layer hens Carbon negative: harvesting removes more carbon from the air than the processing emits
Free shipping on orders of $40 or more!
  • Strong Eggshells
  • Enhanced Bioavailability
  • Essential Nutrient
    • Aragonite is the most highly bioavailable source of calcium on the market  
    • Sustainably sourced from the ocean floor
    • Renewable, tasteless, odorless, and dust-free 
    • Layer Calcium is intended for laying hens 20+ weeks old.  
    • Offer Layer Calcium free choice in a separate container and let your chickens help themselves as they need.  
    • Always provide fresh water and grit.  
    • Check the level of Layer Calcium regularly and refill as needed.  
    • Grubbly Farms Layer Calcium is also great for ducks and other laying fowl.  
A Better Calcium Choice

Strong Shells, Small Footprint

It’s not just any calcium, it’s Grubbly Farms calcium—better for your hens, better for the planet. It’s easier to absorb, non-animal based, carbon negative, and sustainably sourced from naturally occurring marine deposits, for less ecosystem disturbance and less risk of pathogen contamination.

Love from our Grubbly family

4.9
Rated 4.9 out of 5 stars
Based on 7 reviews
Total 5 star reviews: 6 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Rating
Ratings
7 reviews
  • BL
    Barbara L.
    Verified Buyer
    I recommend this product
    Rated 4 out of 5 stars
    7/28/25
    Calcium for chickens

    I think it’s pretty good stuff. I’ve seen a girl or two get in there not sure if they like how fine it is compared to the oyster shells. It’s a lot finer and it’s next to the grit so I figured I’ll know in a bit when the ball goes down That they’ve actually been eating it.

    Grubbly Farms
    7/28/25

    Thanks for sharing your thoughts on our Layer Calcium! We appreciate your feedbawk about the finer texture and how your girls are adjusting to it. Hopefully, once they get used to it, it will become a favorite! If you have any questions or need tips, we’re happy to help. 💚

  • CM
    Cathy M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/4/25
    Good stuff

    Chickens seem to love it

    Grubbly Farms
    8/4/25

    Thank you for your kind words! We’re glad your chickens are enjoying the Layer Calcium. 💚

  • SP
    SANDRA P.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/4/25
    EXPECTING EXCELLENT RESULTS!!!

    Our Chicks are Pullets so waiting till they are a little older before we introduce Layer Calcium to them. At what age do you recommend starting them on Layer Calcium?

    Your Products are FABULOUS!!! We've been a Customer since 2012

    SandyP

    Grubbly Farms
    8/4/25

    Thank you for your wonderful review and for being part of our Grubbly family since 2012! For pullets, we recommend starting Layer Calcium when they are 20 weeks or older. This helps support strong eggshells and overall health as they begin laying. We’re so glad to hear you love our products and appreciate your continued trust! 💚

  • CO
    Cheryl O.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/2/25
    Excellent

    The girls actually prefer the layer calcium over oyster shells. And their eggs are definitely harder. Highly recommend!

    Grubbly Farms
    8/3/25

    Thank you for sharing your experience! We’re thrilled to hear your girls prefer our Layer Calcium and that it’s helping produce harder eggs. We appreciate your recommendation! 💚

  • MB
    Mary B. N.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    7/31/25
    Seems like a good product

    We just began using the Grubbly Farms Layer Calcium. The girls are still getting used to it,

    as we have been using larger chunkier calcium up until now. They do seem to be taking to it so perhaps the smaller size is easier for them to take. So far so good.

    Grubbly Farms
    7/31/25

    Thank you so much for sharing your experience! We’re glad to hear your girls are taking to the Layer Calcium so well. Here’s to many happy, healthy hens ahead! 💚

FAQ
  • Calcium is important for many reasons. It’s imperative for their nervous system, digestive system, bone growth/development, phosphorus absorption, and for maintaining healthy blood flow and heart rate. Lastly, it’s crucial for strong eggshells, which are made up of about 90% calcium. 

    Considering the daily calcium requirements for basic bodily functions, in addition to the calcium requirements for a hen that lays an egg every other day, calcium is crucial to their health and longevity.  

    Calcium is drawn from the bones for eggshell development. It is especially important that a laying hen gets enough calcium so that she can both create eggshells and build new bone.   

  • Yes. Calcium needs vary for each hen. A lot of factors come into play: age, rate of lay, illness/disease, digestive health, and diet to name a few.Free-choice supplemental calcium allows a hen to adjust her calcium consumption based on her needs.

  • Oyster shells are a widely known source of calcium for chickens, however there are some notable differences between Grubbly Farms Calcium compared to oyster shells. 

    Efficiency:  Grubbly Farms Calcium Supplement is a form of calcium carbonite (naturally occurring aragonite) rather than calcite (oyster shells). Aragonite is the most efficient calcium source available for chickens because the crystalline structure is easier for hens to absorb and use, which is crucial for strong eggshells. 

    Sustainability:  Aragonite is sustainably mined from sedimentation processes that are naturally and consistently forming in the Bahamas. It’s also carbon negative, so harvesting removes more carbon from the air than the processing emits. Oyster shell collection can lead to ecosystem disruption.   

    Purity and Non-Animal Based:  Aragonite is non-animal based, reducing the risk of contamination with marine borne pathogens. It’s also naturally very pure because it is mined from marine deposits. Oyster shells can vary in quality as a by-product of the food industry.   

    Preferred Taste:  Aragonite has a more neutral taste compared to oyster shells, which can be too salty or fishy for some of your pickier ladies.  

  • You generally don’t have to worry about excess calcium in backyard flocks. Avoid mixing it with feed. When the option is provided separately, they won’t typically eat it unless they need it. If you are concerned about calcium excess and notice calcium deposits on eggs, consult your veterinarian.

  • Chicks do not need supplemental calcium however there is no harm in them having access. They likely won’t eat it. It’s more important for chicks to have supplemental protein treats, like Grubblies. 

  • Provide calcium year-round in a separate, easy-to-access bowl for chickens 20+ weeks.

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