Rx Vitamins Bio-C Powder Immune Supplement for Cats & Dogs, 4-oz bottle

By Rx Vitamins
Rated 4.6364 out of 5 stars
$17.00Chewy Price
$18.00Chewy Price
$16.15Autoship Price
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About This Item


  • Easy-to-administer powder that helps boost the immune system of your furry friend.
  • Contains bioflavonoids to increase the absorption and utilization of vitamin C in your pet.
  • Naturally buffered and reduces gastric distress commonly associated with high doses of straight ascorbic acid.
  • Features sodium ascorbate, which has a saltier, less sour taste than ascorbic acid.
  • Approved by the National Animal Supplement Council Seal (NASC).

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Nutritional Information

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Top IngredientsVitamin C (Sodium Ascorbate), Lemon Bioflavonoids (24% Flavonones).Active Ingredients: Each Drop Contains: 6 mg, of N-Dimethylglycine (D mg )., Inactive Ingredients: Citric Acid...Active Ingredients: Organic Mushroom Blend, A Proprietary Blend of Trametes Versicolor (Turkey Tail), Agaricus Blazei (Sun Mushroom)...Active Ingredients per ml (20 drops): A Proprietary Blend of Organic & Wildcrafted Herbal Extracts (1:4) 340 mg (Echinacea Leaf and Root, Astragalus, Pau D'Arco...Active Ingredients: A Proprietary Blend Containing Extracts of Certified Organic Olive Leaf 1:4, Echinacea Purp Root and Herb 1:4, Eleuthero Herb 1:4....
Breed SizeExtra Small Breeds, Small Breeds, Medium Breeds...Extra Small Breeds, Small Breeds, Medium Breeds...Extra Small Breeds, Small Breeds, Medium Breeds...Small Breeds, Medium Breeds, Large BreedsExtra Small Breeds, Small Breeds, Medium Breeds...
Health FeatureImmune SupportImmune SupportImmune SupportAnti-Fungal / Anti-Bacterial, Diabetic Support, Immune Support...Immune Support
LifestageAdultPuppy, Kitten, Adult, SeniorPuppy, Kitten, Adult, SeniorPuppy, Kitten, Adult, Senior, All LifestagesPuppy, Kitten, Adult, Senior
Food FlavorUnflavoredUnflavoredUnflavoredUnflavored
Food FormSupplementSupplementSupplementLiquid, SupplementSupplement
Special DietGluten Free, Human-Grade, Indoor...

Questions & Answers

3 Customer Questions

How many milligrams of vitamins c per scoop?
Answer by ChewyNov 18, 2021
Each scoop provides 445 milligrams of ascorbic acid (vitamin C) and 55 milligrams of sodium.

How many servings in the bottle?
Answer by ChewyNov 08, 2019
Each 4 ounce bottle of this product contains 210 scoops, and each scoop is 1/4 of a teaspoon. The servings will vary, based on your dog or cat's weight.

where is this product sourced and manufactured?
Answer by ChewyOct 26, 2023
The raw materials for the Bio-C are all sourced here in the US. The product is manufactured and packaged in New York.

ReviewsWrite a Review

Rated 4.6364 out of 5 stars
11 Ratings
Would recommend to a friend

11 Customer Reviews

Rated 4 out of 5 stars
By Teresa on Oct 31, 2023

Good stuff

I bought this to help keep my little toothless, FIV positive boy healthy. He is an outdoor cat except at night and in the winter when he comes into the garage with his Mama and his little friend. Because all his teeth were removed he is at risk for bacteria in his mouth. So far he seems to have quite a bit of pep in his step..I would recommend if you have a pet with a compromised system. And it must not have a taste at all - he never notices it in his food.

Rated 5 out of 5 stars
By None on Jun 14, 2023

We like just about all the products from Chewy. Do you ever send coupons that returning customers can use. I get coupons for first time buyers about once a month. You can only be a first time buyer once.

Rated 4 out of 5 stars
By Mike on Nov 19, 2023

Joint care

Just started the product.

Rated 5 out of 5 stars
By Mark on Sep 26, 2022

Better than on-time delivery with a good product.

Talk about speedy customer service! Chewey is always prompt but this order came in day. Bravo! The vitamin C for our dogs is effective and helpful.

Rated 5 out of 5 stars
By Lizzie on Apr 2, 2022

Works for my cats

I have a cat with herpesvirus whose tendency is upper respiratory infections on a bad day and vicious snotballs on a good day. We've tried about every bandaid treatment recommended by the vet, and undecided to try this out because Vit C helped my health. Yall, this stuff is amazing. He sneezes way less often, and his mucus production is way down. No URI's since he started it. He cant detect any flavor when mixed with wet food, so he takes it well. Overall, I highly recommend

Rated 5 out of 5 stars
By Alex on Nov 27, 2021

Just keeps getting better

I had to buy this for my cat who has a whole host of GI issues, bladder crystals being one of them. The product has reduced the crystals in his bladder, has helped increase his thirst so he drinks more water (crucial in cats), and I believe has helped calm his tummy down. They've even improved the taste over the last couple months without losing the effectiveness of the product. I can't say enough good about it. Thank you!

Rated 4 out of 5 stars
By BioC on May 26, 2021

Bought for Urinary Tract Health

I think this is a good quality product - bioflavinoids are great antioxidants and this was something recommended for me to use while treating my dog for a bladder stone. Unfortunately he doesn't like the taste of it mixed with either his food or his favorite treat - sour cream!

Rated 5 out of 5 stars
By Leslie on May 8, 2021

Excellent Product

Bio-C is an excellent way to get Vitamin C into my two dogs. It became extremely valuable when the entire household had COVID19. My two were sick but not as sick as they could have been or would have been. I keep them both on Bio-C to keep their immune systems functioning well.

Rated 5 out of 5 stars
By Nina on Dec 6, 2020

Bladder crystals gone!

After one month of applying powder on kibble twice a day, my dogs stubborn bladder crystals are finally gone! As an added benefit, not that he had elevated counts but my dog's liver looked much better on ultrasound. Totally recommend!

Rated 5 out of 5 stars
By CarolynF on May 6, 2020

Fantastic supplement for recovering or ill dog

Our vet said even though dogs make their own vitamin C, at times of physical stress or fighting infections, they may not make as much as they need. We add Bio-C to our 8 yr old and 14 yr old dogs' food whenever they are sick or were recovering from surgery. A powerful antioxident, Bio-C was well tolerated (no spit up), and really makes a difference to how they're feeling and how they recover. My vet even has us add it (as well as Proviable) when the dogs are on antibiotics.