SpiruGreen for Cats & Dogs truly packs a one-two punch with all the nutrient value of spirulina, including carotenoids, phycocyanins and enzymes, plus all the goodness of microalgae astaxanthin, one of the world's most powerful fat-soluble antioxidant carotenoids.Product FactsActive Ingredients per 1 Tablet (500 mg)Organic Spirulina (Arthrospira platensis)............................485 mgMicroalgae (Haematococcus pluvialis) .......................15 mgInactive Ingredients: Silicon Dioxide.For use in cats & dogs only. Recommended to support daily immune health. Administer orally, once per day.Animal Type Amount Tablet(s)Cats (2+ lbs.) 500 mg 1Toy Breed Dogs (up to 14 lbs.) 500 mg 1Small Breed Dogs (15-29 lbs.) 750 mg 1Medium Breed Dogs (30-49 lbs.) 1 g 2Large Breed Dogs (50-79 lbs.) 1.5 g 3Giant Breed Dogs (80+ lbs.) 2 g 4Safe use in pregnant animals or animals intended for breeding has not been proven. If animal's condition worsens or does not improve, stop product administration and consult your veterinarian.For animal use only. Keep out of the reach of children and animals. In case of accidental overdose, contact a health professional immediately.