10 Best Calcium Supplements For Poultry 2026 in the United States

The Scratch and Peck Limestone Supplement for Chickens and Ducks is a solid choice for ensuring your poultry gets the calcium they need. One of its main strengths is its high calcium content, which is crucial for strong eggshells and bird health. The supplement comes in a limestone form, which is a premium alternative to oyster shells, known for being harder to source.

It's particularly useful because it allows for free-choice feeding, meaning your birds can consume the amount of calcium they need at any time. This feature is beneficial because different breeds and individual birds may have varying calcium requirements. Another significant advantage is that it is sustainably sourced in the USA, which is a plus for environmentally-conscious consumers.

The 8-pound bag is a practical size for most flock owners, providing a good balance between quantity and ease of handling. This limestone supplement is a reliable and sustainable source of calcium, particularly suited for those looking to maintain strong eggshells and overall poultry health.

Pecking Order Oyster Shell is a natural calcium supplement designed specifically for laying hens to support strong eggshell formation and healthy bones. Its main strength lies in providing a highly bioavailable calcium source derived from crushed oyster shells, a long-trusted option for poultry keepers. Offered in a granule form, it allows hens to self-regulate their intake, which can improve egg production and reduce issues like thin or brittle shells.

The supplement focuses solely on calcium, without additional vitamins or minerals, so it’s best used alongside a balanced feed to meet all nutritional needs. Its natural origin means it contains no synthetic additives, appealing to those who prefer a simple, safe supplement. The 5-pound packaging is convenient for small to medium flocks and easy to store.

Although it does not provide extra nutrients beyond calcium, its targeted support for eggshell and bone health makes it well-suited for backyard or hobby poultry owners looking to enhance their hens’ shell quality and longevity.

The Small Pet Select Flaked Oyster and Seashell Mix is a natural calcium supplement specifically designed for chickens, ducks, and other waterfowl. It comes in a flaked form, which is easy for birds to consume and digest. The calcium in this product comes from oyster shells and seashells sourced from the UK, known for their good bioavailability, meaning the birds can absorb and use the calcium effectively. This supplement is particularly useful for laying hens because it strengthens eggshells, leading to healthier birds and better egg quality. Another advantage is that it also supports healthy plumage, which is important for overall bird health.

One of the strengths of this supplement is its all-natural composition without added allergens like dairy, making it suitable for all life stages and breed sizes. It contains no unnecessary additives, focusing solely on providing calcium, which is the main nutrient needed for egg production and bone strength. The product is offered in a 5-pound bag, which should last quite a while depending on the flock size.

This supplement primarily focuses on calcium and does not provide additional nutrients like phosphorus or vitamin D3, which sometimes help with calcium absorption or overall bird health. Since it is a single-ingredient product, it is important to ensure the birds’ diet includes other necessary minerals and vitamins. If you are looking for a straightforward, natural calcium source to improve your poultry's eggshell strength and calcium intake, this product is well suited but is best paired with a balanced diet to cover all nutritional needs.