Vet's Best Seasonal Allergy Support supplement for dogs (60 chewable tablets) helps to maintain normal histamine levels and skin health. Seasonal Allergy Support uses key natural ingredients (nettle, perilla leaf, quercetin, and citrus) to help dogs that suffer from seasonal allergies, along with a soothing mix of antioxidants to promote skin health. Natural ingredients are scientifically optimized to a low molecular weight for better absorption and digestion. Perfect large breed dogs and small breed dogs 1 year and older. Allergy supplement can be given twice daily (follow supplement directions).