Oyster Shell

Give laying hens the natural calcium boost they need with Mile Four Oyster Shell. Made from all-natural USA-mined, crushed oyster shell limestone, it helps chickens produce stronger, thicker eggshells while supporting overall health and longevity. Perfect for hens 20+ weeks old, this simple supplement keeps flocks healthy & eggs durable—naturally.

Key Features:

• Supports Strong Eggshells: Eggshells are 94–97% calcium carbonate—this supplement replenishes what hens lose during daily laying.
• Essential Calcium Source: Strengthens bones, reduces egg breakage, & supports consistent, healthy egg production.
• Boosts Flock Health: Promotes stronger bones, improved cardiovascular function, & overall vitality in laying hens.
• All-Natural Formula: Made from 100% natural, organic oyster shell with no additives, chemicals, or fillers.

Offer oyster shell free-choice in a separate dish next to the feeder, never mixed into feed, so each hen can self-regulate intake. Thin, soft, or easily cracked eggshells are usually the first sign a flock needs more calcium; refill the dish sooner if that starts showing up.

Keep the dish topped off rather than rationing it, and store the bag in a cool, dry place.

Check out our Chicken Feed Guides:
What is Oyster Shell?
How to Transition by Chicken Age
How to Transition from Old to New Feed
How to Ferment Chicken Feed

• Free Shipping: FedEx (1-3 day), 2pm daily cutoff
• Risk Free Trial: If your chickens don't love their 1st bag, it's on us.