Essential Mix – Now With Added Calcium And vitamins Available As Sample Packs!our Nutritional Experts Have Been working very hard To Develop & Improve Our Seed Mixes. Essential Mix Now Contains Added Calcium – To Promote Healthy Bone, Beak & Feather Growth, Plus Vitamins A, d E, Biotin – To Strengthen Beaks & Bones & Carotenoids – To Develop Feather Colour & Protect From Sunlight Damage. essential Mix Provides A Year Round Balanced Diet For All The Birds In Your Garden, Even The Tiny Ones. containing 11 Carefully Selected Seeds & Grains, Its Suitable For All Beak Shapes & Sizes! All Of The Ingredients Are Edible In Their Entire Form, So They Have Either Been Dehulled Or Are Entirely Edible, Which Means That You Wont Pay For Wasted Husks & There Will Be Less Mess In The Garden!