Horizon Acres Oyster Shell helps strengthen eggshells by providing calcium when the bird needs it most. Although our Horizon Acres Layer Pellets & Crumbles contain calcium, it is sometimes necessary to feed a little extra. It can be fed periodically as a supplement, free choice. This 8lb resealable bag ensures your birds receive the extra calcium they need, especially when their diet requires a boost. Ideal for both free-range and coop-raised chickens, this oyster shell supplement supports overall health and egg production.