Cabbage Cacao / Cocoa Camomille Canary bird droppings Canary bird feathers Canary grass Candida albicans Carambola Caraway Cardamom Careless weed Carob (E410) Carrot Cashew nut Castor bean Cat dander Catfish Cauliflower Cedar Cedar elm Cefaclor Celery Chaetomium globosum Cheese, cheddar type Cheese, mold type Cherry Chestnut Chick pea Chicken Chicken droppings Chicken feathers Chicken, serum proteins Chilli Pepper Chinchilla epithelium Chloramin T Chlorhexidine Chub mackerel Chymopapain Cladosporium herbarum Clam Clove Cochineal extract (Carmine red) (E120) Cocklebur Cockroach Oriental Cockroach, American Cockroach, German Cocksfoot Coconut Coffee Common pigweed Common ragweed Common reed Common silver birch Common wasp (Yellow Jacket) Comprehensive Cancer Panel (Fusions + Variant NGS panel) Comprehensive Cancer Panel + MSI Coriander Corn Cotton seed Cotton, crude fibres Cottonwood Cow dander Cow's milk Cow's whey Crab Crayfish Cucumber Cultivated oat Cultivated rye Cultivated wheat Curry (Santa Maria) Curvularia lunata Cypress