Manna Pro Soluble Grit (Oyster Shell Calcium Supplement)

Full review

Manna Pro Soluble Grit is a digestive aid formulated specifically for backyard poultry keepers who want to support healthy digestion in their flocks. Unlike insoluble granite grit, which chickens need to mechanically break down whole grains and fibrous treats in their gizzard, soluble grit is actually composed of oyster shell, making it a calcium supplement rather than a grinding tool. This distinction matters a great deal to anyone raising laying hens, since calcium is essential for producing strong, crack-resistant eggshells, and hens that are shorted on dietary calcium often lay thin-shelled or soft-shelled eggs, or may even begin depleting calcium from their own bones to keep up with egg production.

The product comes in a granular form that chickens can peck at free-choice, meaning flock owners typically offer it in a separate dish alongside regular feed rather than mixing it directly into the ration. This free-choice approach allows each bird to self-regulate her calcium intake based on her own needs, which is particularly useful in a mixed flock where laying hens, roosters, and younger birds all have different calcium requirements. Manna Pro, as a long-established name in the homesteading and backyard poultry supply space, packages this grit in resealable bags sized for small to mid-sized flocks, making it a practical pantry staple for anyone who keeps hens for egg production.

Beyond supporting shell quality, consistent access to soluble grit can help prevent some of the downstream problems associated with calcium deficiency, such as egg binding or weakened skeletal structure in older hens. Homesteaders often pair this supplement with their regular layer feed, especially during peak laying season when hens are putting out eggs at a rapid clip and their calcium demands are highest. Because it's shelf-stable and easy to store in a coop or feed shed, Manna Pro Soluble Grit fits naturally into the daily or weekly routine of flock maintenance, serving as one of those small but meaningful additions that experienced chicken keepers rely on to keep their birds productive and healthy over the long haul.