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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Manna Pro Crushed Oyster Shell for Chickens, Calcium Supplement, 5 lb Bag

Manna Pro Crushed Oyster Shell for Chickens, Calcium Supplement, 5 lb Bag

Product ID: 4312710

Details

Age Range (Description)
All Life
Brand
Manna Pro
Flavor
Egg
Item Form
Pellet
Specific Uses For Product
Outdoor

🐚Premium oyster & coral calcium blend

📦5 lb convenient resealable bag

🔥Heat-treated for purity & safety

Description

🐔 Elevate your flock’s egg game with nature’s calcium boost!

CLEAN SAFE NUTRITION - Heat-treated oyster shells eliminate contaminants for worry-free feeding.
PROUDLY MADE IN THE USA - Support local quality with a trusted, domestically sourced supplement.
TAILORED CALCIUM INTAKE - Self-fed formula lets hens regulate their own calcium needs naturally.
BACKYARD TO COMMERCIAL READY - Perfect for all laying poultry breeds and flock sizes, from hobbyists to pros.
EGGSHELL FORTIFICATION POWER - Slow-release calcium ensures consistently strong, crack-resistant eggshells.

Manna Pro Crushed Oyster Shell is a premium, heat-treated calcium supplement designed for laying poultry. Its slow-release oyster and coral calcium blend supports strong eggshell formation and overall bird health. Packaged in a convenient 5 lb bag, it allows hens to self-regulate calcium intake, making it ideal for backyard flocks and commercial farms alike. Made in the USA with no artificial additives, it’s the trusted choice for enhancing egg quality and flock vitality.

Specifications

ASIN	B000MD59TC
Additional Features	Heat-treated for purity
Age Range (Description)	All Life Stages
Age Range Description	All Life Stages
Allergen Information	Celery Free
Best Sellers Rank	#5,672 in Pet Supplies ( See Top 100 in Pet Supplies ) #76 in Bird Food
Brand	Manna Pro
Brand Name	Manna Pro
Breed Recommendation	All Breed Sizes
Container Type	Bag
Customer Reviews	4.7 out of 5 stars 15,897 Reviews
Flavor	Egg
Global Trade Identification Number	00095668069629
Item Form	Pellet
Item Type Name	Bird Food
Item Weight	5 pounds
Manufacturer	TV Non-Branded Items (Pets)
Manufacturer Part Number	1000210
Model Number	1000210
Number of Items	1
Occasion	Birthday
Package Size Name	5 lb Bag
Pet Type	Bird
Product Benefits	Supports strong eggshell formation in laying hens
Recommended Uses For Product	Poultry egg-laying support
Special Ingredients	Oyster Shell
Specific Uses For Product	Outdoor
Target Species	Chicken
UPC	095668069629
Unit Count	5 Pounds

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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