VetClassics CAS Options Extra Strength Immune & Antioxidant Support Chewable Tablets Dog & Cat Supplement, 120 count

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A powerful blend of four functional mushrooms: Maitake, Reishi, Shiitake, and Turkey Tail combined with antioxidants to provide extra strength immune support. Formulated to support and balance the immune system to promote overall health and well-being for pets, especially during times of stress.

Key Benefits
  • The immune system is the surveillance system of the body, when the immune system becomes weakened, it is essential to reestablish a healthy immune system balance quickly to maintain overall health.
  • Mushrooms contain polysaccharides, beta glucans, and triterpenoids that work synergistically to help support the immune system.
  • Antioxidants Coenzyme Q-10, Vitamin A, Vitamin C, Vitamin E and Milk Thistle help to scavenge free radicals that can cause cellular damage.
  • MADE IN THE USA and VETERINARIAN FORMULATED - All Vet Classics products are veterinarian formulated and manufactured in the USA in an FDA audited, cGMP compliant facility.
  • SATISFACTION GUARANTEED - All Vet Classics products come with a 100% satisfaction guarantee, if you are not satisfied for any reason you can get a full refund!

See all items by VetClassics

  • Item Number
  • Weight
    15.68 ounces
  • Lifestage
  • Breed Size
    Small Breeds, Medium Breeds, Large Breeds
  • Food Form
  • Product Form
    Chewable Tablet
  • Drug Type
Nutritional Info

Active Ingredients per 3 g Tablet: Reishi Mushroom 578 mg, Shiitake Mushroom 446 mg, Turkey Tail Mushroom 150 mg, Maitake Mushroom 95 mg, N-acetyl-L-cysteine 79 mg, Vitamin C (Calcium Ascorbate) 60 mg, Coenzyme Q-10 1 mg, Selenium 0.026 mg, Vitamin A 1,050 IU, Vitamin E (D-alpha Tocopheryl Acetate) 53 IU.

Feeding Instructions


Weight Daily Feeding (Tablets)
Under 25 lbs 1/2 Twice
26-50 lbs 1 Twice
51-100 lbs 2 Twice
Over 100 lbs 3 Twice


Weight Daily Feeding (Tablets)
Under 5 lbs 1/2
Over 5 lbs 1
Rating: 5.0 of 5 stars 1 Review 1 Review 5 out of 5 Stars

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Rating: 5.0 of 5 stars 5 / 5

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  • 5 out of 5 stars

    Keeping the "Zodiac Sign" Away for Nearly Three Years

    By PuppyGoddess on Mar 22, 2021

    My oldest girl just turned 12 yesterday (21 March 21). She had two nasty Mast Cell Tum0rs removed in August 2018. We immediately began seeing a holistic veterinarian to keep the "zodiac sign between Gemini & Leo" away. (We don't say the c-word so we don't jinx ourselves, we don't want that monster back in our lives). Our vet prescribed CAS Options and we have used it faithfully since then. Two tablets twice daily (with meals) for our Husky/GSD/Malamute/White Shepherd princess. I truly believe that this product has helped us keep her healthy and safe! I love that we can now get it from Chewy without an Rx. Thanks, Chewy, for helping us keep our babies safe & healthy!

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