I have 2 adult hens, how much should they be given per day or week?

Put a bowl or dish with it out for them. Hens are very in tune with their body and know when they need calcium. Refill as often as needed.

Is this too large for vermi-composting. Will worms eat it?

If worms eat oyster shell and calcium they would eat this, it's good quality rock.

Hi can i feed baby chiks?

You don't want to feed this to baby chicks. Only when they start laying eggs. Only feed medicated chick feed. You can add chick and grit later when there are about 8 weeks old. But do not mix the grit in with their feed. The oyster shell is to help with the calcium needed to create eggs. So do not give that until they are laying.

Where is this from USA ?

I can’t find anywhere on the package a country of origin. MannaPro is from St. Lewis, but the bag says manufactured for MannaPro.

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Description

🥚 Elevate your flock’s eggshell game with pure, precision calcium!

PURE CALCIUM POWER - Heat-treated oyster shells ensure premium purity and safety for your flock.
PRECISION PELLET SIZE - Crushed to an ideal size for slow, steady calcium absorption—no more guesswork.
EGGSHELL REINFORCEMENT - Supports the creation of strong, resilient eggshells to maximize your hens’ laying potential.
SELF REGULATED NUTRITION - Allows hens to control their calcium intake naturally, reducing soft or thin eggshell risks.
ALL NATURAL ADDITIVE FREE - No artificial preservatives—just pure, natural calcium for healthier birds and better eggs.

Manna Pro Oyster Shell is a 5-pound bag of heat-treated, crushed oyster shells designed as a natural calcium supplement for laying hens. Its optimal pellet size promotes slow, steady absorption, helping hens self-regulate calcium intake to build strong eggshells and maintain skeletal health. Free from additives, this premium supplement is trusted by poultry keepers aiming for peak egg quality and flock vitality.

Specifications

ASIN	B000MD59TC
Additional Features	Heat-treated for purity and calcium supplement for birds
Age Range Description	All Life Stages
Allergen Information	Celery Free
Animal Food Diet Type	Raw
Best Sellers Rank	#23,000 in Pet Supplies ( See Top 100 in Pet Supplies ) #455 in Bird Food
Brand Name	Manna Pro
Breed Recommendation	All Breed Sizes
Container Type	Bag
Customer Reviews	4.7 4.7 out of 5 stars (15,110)
Flavor	Unflavored
Global Trade Identification Number	00095668069629
Item Form	Pellet
Item Type Name	Bird Food
Item Weight	5 Pounds
Manufacturer	Manna Pro
Manufacturer Part Number	1000210
Model Number	1000210
Number of Items	1
Occasion	Birthday
Product Benefits	Builds strong eggshells in birds
Recommended Uses For Product	Poultry farming, Egg-laying
Special Ingredients	Oyster Shell
Specific Uses For Product	Outdoor
Target Species	Fish
UPC	095668069629
Unit Count	80 Milliliters

Reviews

D**Z

Great product !

21.02.2026

A**K

Para fortalecer cascaron de blanquillo de gallina y aves de distribución sencilla ya sea solo o en el alimento combinando

10.09.2024

K**N

Great product and value easy to use for health care digestion appearance was good

10.12.2025

A**A

Al principio no lo comía porque le costaba trabajo desbaratarlo, pero lo moli un poco y le gusta mucho. Esta poniendo buenos huevos

16.11.2023

M**N

This crushed oyster shell I give to my chickens to help make their egg shells harder. It works! and my chickens do live to eat it.

10.03.2026

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Oyster Shell, 5-Pounds

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