Healthy Hen™ Rosemary Magic - Natural Antibiotic - Poultry Feed Additive. This formula is 100% natural, powerful Rosemary with natural pain relieving and anti-inflammatory properties that supports the overall health of your flock. Rosemary has been used by poultry farmers for years to promote good health. It is great for hens experience stress and molting birds. Feed 1-2 tablespoons per bird 2-3 times per week. Mix with food or offer alone as an appetizing treat and is safe for ducks. Ingredient is 100% dried Rosemary. 3.5oz Bag.