NaturVet Ester-C Plus Apple Flavor for Horses, 1 lb 8 oz Powder, Made in USA Ester-C Plus is the highest quality Vitamin C available. Vitamin C is a water soluble antioxidant that helps protect against free radicals that cause cellular damage while improving overall health. The Ester-C manufacturing process neutralizes the acidity of ascorbic acid and maximizes the formation of mineral ascorbates and Vitamin C metabolites that speed the absorption of Vitamin C. Superior Source of Vitamin C to help protect against free radicals that cause cellular damage while improving overall health. Yummy apple flavor powder 1.8 lbs. for use in all classes of horses. Give one 11cc scoop per 1000 lb. horse per day. Guaranteed Analysis per 11cc scoop: Calcium Ascorbate (from Ester-C). All NaturVet products are veterinarian formulated and manufactured in the USA in an FDA audited, cGMP compliant facility. 100% Satisfaction Guarantee.