The best-selling vitamin supplement. Contains Vitamin D3, Niacin, Pantothenic Acid, Dextrose, Vitamin K, Vitamin A, Vitamin B12, Riboflavin and Dextrorotatory. Any vitamin is most effective given on a regular, long-term basis. I give this product, combined with Probios 6 days a week, year-round. If medicating, I do not use the Pigeon Builder or Probios during the treatment period. Handy, reusable container. 2 tbsp. per gallon of drinking water. Change water every day. Foy`s Pigeon Builder 2.5 lbs.