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4.9
Rated 4.9 out of 5 stars
20 Reviews

Layer Calcium

supplement • laying hens

  • Layer Calcium
  • Layer Calcium
  • Layer Calcium
  • Layer Calcium
4.9
Rated 4.9 out of 5 stars
20 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 20 reviews
Total 5 star reviews: 18 Total 4 star reviews: 2 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Rating
Ratings
20 reviews
  • MM
    Michele M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/11/25
    Great way to add calcium to your feathered friends diet!

    I just learned about this product and immediately ordered some. I’ve always put my chicken’s egg shells in my blender and added them back to their ferments. But I sell a lot of eggs in the summer, and I felt they might not be getting enough calcium in their diet. I also provide oyster shells, of course, but I’m never sure how much of those my hens consume. This product is wonderful! It blends in easily to the ferments I give them every morning, and they always eat every drop, so I know for certain they are getting a good dose of calcium in their diet. I love this company!

    Grubbly Farms
    8/11/25

    Thank you so much for sharing your experience! We’re thrilled to hear Layer Calcium fits so well into your hens’ routine and gives you peace of mind about their nutrition. It’s wonderful to know your flock is getting the calcium they need, especially during busy egg-selling season. We truly appreciate your support and kind words. 💚

  • 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. 💚

  • CT
    Carol T.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/20/25
    My girls love this!!

    I have a board of this sitting beside their feeders and my hens will help themselves as they need calcium!! great product

    Grubbly Farms
    8/20/25

    Thank you for sharing! We’re so happy to hear your hens are enjoying the Layer Calcium. It’s wonderful to know it’s making a difference for your flock. 💚

  • DS
    Deborah S.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/17/25
    Chicken Calcium

    My girls love their calcium. It's the only thing they don't kick their bedding and poop in. They began pecking at it immediately after I set it down. Thanks Grubbly!

    Grubbly Farms
    8/20/25

    Thank you for sharing! We’re so glad your girls are enjoying the Layer Calcium. 💚

  • DV
    Devon V.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    8/16/25
    My girls Love it!

    I have tried other calcium supplements and my girls had NO interest. Im not sure if the others were too big or not as tasty....but they LOVE this! Very little waste and the egg shells are amazing and strong! Buying more after this review so I never run out! Thank you!

    Grubbly Farms
    8/20/25

    Thank you for sharing! We’re so glad your girls love the Layer Calcium and that it’s making a difference with their eggs. We appreciate your feedbawk and support! 💚

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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