10 Best Calcium Supplements For Poultry 2026 in the United States

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 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.

The Homestead Harvest Coastal Oyster Shell Calcium Supplement is designed to enhance the health and wellbeing of chickens and ducks by providing essential calcium. The supplement is in granular form, making it easy to mix with other feed and ensuring that your flock receives a steady supply of calcium.

One of the key strengths of this supplement is its high-quality coastal oyster shell source, which is a natural and effective provider of calcium. This helps in promoting strong eggshells, reducing breakage, and improving feather quality for a vibrant flock. The 50 lb size is convenient for ensuring a consistent supply of calcium over time, especially for larger flocks.