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

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About This Item

Details

  • 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).

Ingredient Information

Instructions

FAQ

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.

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.

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.
4.6
Rated 4.6 out of 5 stars
57 Ratings

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Effectiveness

91% Positive

Form and Administration

82% Positive

Ingredients

92% Positive

Nutritional Value

83% Positive

25 Customer Reviews



Rated 3 out of 5 stars
By Elizabeth on Nov 18, 2025

Our cats wouldn't eat it

We were hoping to get our cats to ingest some vitamin c with there food, but no matter the formulation, they're just not fans. This version was no different, un

We were hoping to get our cats to ingest some vitamin c with there food, but no matter the formulation, they're just not fans. This version was no different, unfortunately.


Rated 5 out of 5 stars
By Owen on Jul 22, 2025

Tastes good

Apparently my dog loves this stuff! After the first sprinkle on her food she started watching for me reaching for the bottle. Previously she would nibble her breakfast

Apparently my dog loves this stuff! After the first sprinkle on her food she started watching for me reaching for the bottle. Previously she would nibble her breakfast over a couple hours, but now she eats the whole bowl in one go. Our vet and a trainer recommended this supplement for several reasons and said they had seen dogs like it. My girl is definitely on board with it!


Rated 5 out of 5 stars
By Sharon on Jun 22, 2025

Great boost to immune health of pet

My 6 year old cat was just diagnosed with FIV (cat version of HIV) in the active stage. Her immune system is not working to help with various infections. In this

My 6 year old cat was just diagnosed with FIV (cat version of HIV) in the active stage. Her immune system is not working to help with various infections. In this case her eyes. The Dr recommended Vitamin C and Lysine to boost her immune system. I tried the chews for both and they did not work. Then found something to add to her food. I brought them to the Vet. She gave me the dosages for them for my cat. She has been improving (not cured as there is none) But at least boosting her immune system appears to give her some energy and improve her eating. (her weight went from 10 lbs to 6 from Sept 24 to May of this year. Her weight is holding steady at 6.4 and I hope she gains more.


Rated 4 out of 5 stars
By Nataliya on Jun 27, 2025

Nice

I’m not sure about this one, but giving it in conjunction with Cosequin makes a difference for my old Coker spaniel lady. She would yelp with pain getting up, which

I’m not sure about this one, but giving it in conjunction with Cosequin makes a difference for my old Coker spaniel lady. She would yelp with pain getting up, which broke our hearts. Ever since those 2 were added to her diet and build up in her system, she doesn’t do that anymore.


Rated 5 out of 5 stars
By Susan on Jun 16, 2025

The customer service and the speed with which the order arrived.

I actually bought it for an animal shelter that has some cats with health issues that weren’t responding to other treatment. Staff has told me the cats are doing

I actually bought it for an animal shelter that has some cats with health issues that weren’t responding to other treatment. Staff has told me the cats are doing better since they have been using the Bio-C, for which I am very grateful. I wish all pet supply stores would carry it!


Rated 5 out of 5 stars
By Keri on Oct 10, 2025

Vet recommended for immunity

My vet recommended Bio-C to help boost my dog’s immunity. Perfect for him.

My vet recommended Bio-C to help boost my dog’s immunity. Perfect for him.


Rated 1 out of 5 stars
By Sherri on Aug 10, 2025

Not for my cats

My cats didn’t like the taste so they wouldn’t eat it with the canned food.

My cats didn’t like the taste so they wouldn’t eat it with the canned food.


Rated 5 out of 5 stars
By Joanne on Aug 7, 2025

It came with a scoop!

If the boys could taste the powder, they must have liked it!

If the boys could taste the powder, they must have liked it!


Rated 5 out of 5 stars
By Mary on Oct 28, 2024

The addition of bioflavinoids.

My kitty needed something more in his already good array of supplements and the best foods that I can afford. He was not completely healing from a lingering irritation

My kitty needed something more in his already good array of supplements and the best foods that I can afford. He was not completely healing from a lingering irritation. I forget what exactly now what it was but it was barely noticeable his discomfort. So I looked into his overall diet. The key was the inflammation and his immune system needing a boost. to prevail. So, I switched his plain Vitamin C to Rx Vitamins Bio-C with bioflavonoids and voila! Not a problem since the switch! I’m grateful that I had a choice thanks to Chewy! And Kitty is once again serene and happy!


Rated 5 out of 5 stars
By Christine on Nov 28, 2024

Bladder health!

My parents’ dog had a spinal injury that resulted in partial paralysis and difficult fully emptying her bladder, which lead to urinary tract infections. Our veterinary

My parents’ dog had a spinal injury that resulted in partial paralysis and difficult fully emptying her bladder, which lead to urinary tract infections. Our veterinary neurologist recommended vitamin c as a part of her care plan to help prevent utis.