---
product_id: 741921610
title: "Mile Four Oyster Shell for Egg-Laying Hens, Calcium Booster, 4 lbs Bag | Strengthens Eggshells & Bones; High-Calcium Supplement for Laying Hens; 100% Natural Limestone; USA Sourced; Non-GMO"
brand: "mile four"
price: "€ 111.28"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.gr/products/741921610-mile-four-oyster-shell-for-egg-laying-hens-calcium-booster
store_origin: GR
region: Greece
---

# Dual particle size for immediate + slow calcium release 94-97% calcium carbonate for stronger eggshells 100% USA-sourced natural limestone Mile Four Oyster Shell for Egg-Laying Hens, Calcium Booster, 4 lbs Bag | Strengthens Eggshells & Bones; High-Calcium Supplement for Laying Hens; 100% Natural Limestone; USA Sourced; Non-GMO

**Brand:** mile four
**Price:** € 111.28
**Availability:** ✅ In Stock

## Summary

> 🥚 Elevate Your Egg Game with Pure, Powerful Calcium!

## Quick Answers

- **What is this?** Mile Four Oyster Shell for Egg-Laying Hens, Calcium Booster, 4 lbs Bag | Strengthens Eggshells & Bones; High-Calcium Supplement for Laying Hens; 100% Natural Limestone; USA Sourced; Non-GMO by mile four
- **How much does it cost?** € 111.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/741921610-mile-four-oyster-shell-for-egg-laying-hens-calcium-booster)

## Best For

- mile four enthusiasts

## Why This Product

- Trusted mile four brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Backyard Flock Favorite:** Trusted by over 5,000 poultry enthusiasts who demand healthier hens and stronger eggs.
- • **Pure & Proudly American:** Non-GMO, additive-free oyster shell limestone mined exclusively in the USA for trusted quality.
- • **Smart Free-Choice Feeding:** Let your flock self-regulate calcium intake naturally—no overfeeding, no waste.
- • **Stronger Eggs, Fewer Breaks:** Boost eggshell durability with 94-97% pure calcium carbonate—say goodbye to fragile eggs.
- • **Tailored for Laying Hens 20+ Weeks:** Optimized calcium support for mature hens to maintain peak egg production and bone health.

## Overview

Mile Four Oyster Shell is a premium, 100% natural calcium supplement made from USA-mined limestone. Designed for laying hens 20+ weeks old, it combines fine and coarse particles to provide both immediate and sustained calcium release, strengthening eggshells and supporting bone health. Free-choice feeding ensures hens consume exactly what they need, making it a trusted choice for over 5,000 backyard flock owners seeking healthier, more resilient eggs.

## Description

Oyster Shell is a premium source of calcium for building stronger egg shells. Provide to laying hens around 20+ weeks of age. Oyster Shell is rocks with nothing added. Specifically, 100% natural limestone. Oyster Shell is a blend of fine and coarse untreated calcium carbonate (CaCO3) mined from limestone in the USA. Fine particles provide an immediate calcium supply while coarse particles provide a slower, steady calcium release, giving hens a consistent calcium release into their bloodstream overnight for stronger eggs and stronger bones. Eggshells are 94-97% calcium carbonate, so oyster shell is an organic, natural way to give laying hens the calcium boost needed to produce strong eggshells that will not break.

## Features

- STRONGER EGGSHELLS, FEWER BREAKS – Eggshells are 94–97% calcium carbonate; this crushed oyster shell replenishes what laying hens lose daily, reducing cracked and thin-shelled eggs.
- 100% NATURAL & USA MINED – Non-medicated, additive-free crushed oyster shell limestone, mined and sourced entirely in the USA. No fillers, no chemicals, no imported shell.
- FOR CHICKENS 20+ WEEKS – Ideal free-choice calcium supplement for laying hens and ducks once they begin producing eggs; supports bone strength and long-term flock health.
- FREE-CHOICE FEEDING MADE EASY – Serve in a separate dish near the feeder (never mixed into feed) so each bird self-regulates intake; birds naturally eat what they need without overeating.
- TRUSTED BY 5000+ BACKYARD FLOCK OWNERS

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Additional Features | Natural Product Environmentally Friendly, organic |
| Age Range Description | Adult |
| Animal Food Diet Type | Raw |
| Animal Food Ingredient Claim | Additive-Free |
| Asin | B07SG6ZGFB |
| Best Sellers Rank | #41,734 in Pet Supplies (See Top 100 in Pet Supplies) #669 in Bird Food |
| Brand Name | Mile Four |
| Breed Recommendation | All Breed Sizes |
| Container Type | Bag |
| Customer Reviews | 4.5 4.5 out of 5 stars (170) 4.5 out of 5 stars |
| Flavor | Unflavored |
| Global Trade Identification Number | 00737488079470 |
| Item Form | Granule |
| Item Weight | 1.81 kg |
| Manufacturer | Mile Four |
| Manufacturer Part Number | oyster_shell_4 |
| Number Of Items | 1 |
| Occasion | Birthday |
| Package Size Name | 4 Pound |
| Pet Type | Bird |
| Product Benefits | Stronger, more durable eggshells |
| Recommended Uses For Product | Calcium supplement for laying chickens, Eggshell strengthener, Chicken health booster |
| Special Ingredients | Calcium Carbonate |
| Specific Uses For Product | Bone Health, Growth, Healthy Egg shells |
| Target Species | Chicken |
| Unit Count | 64 Grams |
| Upc | 737488079470 |

## Product Details

- **Age range (description):** Adult
- **Brand:** Mile Four
- **Flavour:** Natural
- **Item form:** Solid
- **Specific uses for product:** Behavior, Stomach, Teeth, Weight

## Images

![Mile Four Oyster Shell for Egg-Laying Hens, Calcium Booster, 4 lbs Bag | Strengthens Eggshells & Bones; High-Calcium Supplement for Laying Hens; 100% Natural Limestone; USA Sourced; Non-GMO - Image 1](https://m.media-amazon.com/images/I/81ULiKfAyEL.jpg)

## Available Options

This product comes in different **Flavor Name, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality calcium for your laying hens
*by  on Reviewed in the United States 10 August 2025*

Excellent additional source of calcium for laying hens and they love it. Will have to set up routine shipments.

### ⭐⭐⭐⭐⭐ Great price and fast delivery
*by  on Reviewed in the United States 2 March 2026*

It a great dietary supplement for your chickens

### ⭐⭐⭐⭐ Less than I estimated but still okay for price
*by  on Reviewed in the United States 23 June 2022*

Obviously you have no control over what 4lbs is, the amount was less than I imagined. Ordering online is tricky as far as picturing what you are actually recieving. The size of pieces is perfect for our adult chickens. They seem happy with it, I've had to refill their dish just a few days after initially filling it. I'll be looking into a bigger bag for any future purchases because the 4 lb bag won't be lasting long. We have 5 chickens, I think their calcium need is higher at 6 years old. So this bag might last longer for someone with younger chickens. Otherwise I recommend comparing the 50lb bag with other options.

## Frequently Bought Together

- Mile Four Oyster Shell for Chickens - Calcium Supplement for Chickens, 100% Natural Limestone Calcium Carbonate, Strong Eggshell & Bone Booster, 4 lbs
- Mile Four Chicken Grit for Layer & Grower Chickens Age 8-20+ Weeks - 100% Natural Mineral Chicken Grit Quartzite, Poultry Grit, USA Mined, 4 lbs
- Eaton Pet and Pasture, Premium Laying Hen Nesting Pads, USA Grown & Sustainably Harvested, 13 x 13 (10 Pack)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-09-12*