Check the listing for details. VetClassics CAS Options Extra Strength Immune & Antioxidant, 120 Soft Chews. Condition: New. Listed at 68.99 USD. VetClassics CAS Options Soft Chews Extra Strength Immune & Antioxidant Support Vet Classics CAS Options is an extra strength formula to support and balance the immune system to promote overall health and well-being, especially during stressful events. Contains multiple sources of antioxidants and ingredients to provide immunostimulating proteoglycans and polysaccharides to support Natural Killer (NT) and T-Helper cells. Contains Reishi, Shitake, Maitake and Turkey Tail. For dogs and cats over 12 weeks of age. Directions for use in dogs and cats: Cats: Up to 5 lbs: 1/2 Soft Chew Daily Over 5 lbs: 1 Soft Chew Daily Dogs: Up to 25 lbs: 1 Soft Chew Daily 26 to 50 lbs: 2 Soft Chews Daily 51 to 100 lbs: 4 Soft Chews Daily Over 100 lbs: 6 Soft Chews Daily Daily amount can be divided between AM and PM. Use only as directed by your veterinarian. Responses to supplements may vary by animal. Active Ingredients per 4 g Soft Chew: Reishi Mushroom: 578 mg Shiitake Mushroom: 446 mg Turkey Tail Mushroom: 150 mg Maitake Mushroom: 95 mg N-acety-L-cysteine: 79 mg Vitamin C (Calcium Ascorbate): 60 mg Coenzyme Q-10: 1 mg Selenium: 26 mcg Vitamin A: 1050 IU Vitamin E (D-alpha Tocopherol Acetate): 53 IU Inactive Ingredients:Brewer's Dried Yeast, Canola Oil, Dried Potato Product, Flaxseed, Glycerin, Lecithin, Mixed Tocopherols, Natural Flavoring, Rosemary Extract, Sorbic Acid, Tapioca Starch, Vegetable Oil, Water