Vet's Best Seasonal Allergy Support Dog Supplement combines the soothing mix of antioxidants, along with other natural ingredients for dogs with seasonal allergies. Vet's Best Seasonal Allergy Support helps maintain normal histamine levels and supports skin health due to exposure to pollens and flea bites. Contains Nettle Leaf, used by herbalists in Europe, Africa, Asia and North America to support normal histamine levels. Ingestion does not equal absorption. Each Vet's Best natural ingredient is scientifically optimized to a low molecular weight to promote its maximum absorption and digestion. For all size dogs 1 year or older. 60 Chewable tablets.