Rx Vitamins Rx B12 Liquid Digestive Supplement for Cats & Dogs, 4-oz bottle

By Rx Vitamins
Rated 4.0857 out of 5 stars
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$28.00Chewy Price
$26.60Autoship Price
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About This Item

  • Crafted with high-quality cyanocobalamin, a man-made version of B12 that helps benefit your BFF’s health.
  • Comes in an easy-to-administer liquid solution.
  • Suitable for both cats and dogs.
  • Expertly crafted by a veterinarian.
  • Carries the National Animal Supplement Council Seal (NASC).

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Top IngredientsVitamin B-12 (Cyanocobalamin). Inactive Ingredients: Vegetable Glycerin, Water, Fructose...L-Glutamine (free form amino acid), Cats Claw, N-acetyl D glucosamine...Active Ingredients (per 3.78g scoop): L-Glutamine 125 mg, FOS (Fructooligosaccharides) 110 mg, N-Acetyl Glucosamine...Active Ingredients per ml (20 drops): A Proprietary Blend of Organic & Wildcrafted Herbal Extracts (1:4) 340 mg (Chamomile, White Oak Bark, Meadowsweet...Rice Starch, Aspergillus Oryzae Fermentation Product Dehydrated, Aspergillus Niger Fermentation Product Dehydrated...
Breed SizeAll Breeds, Extra Small & Toy Breeds, Small Breeds...All Breeds, Extra Small & Toy Breeds, Small Breeds...Medium Breeds, Small Breeds, Large BreedsMedium Breeds, Small Breeds, Large BreedsSmall Breeds, Medium Breeds, Large Breeds...
LifestageAdultAdultAdultAdultAdult, Puppy, Kitten, Senior
Health FeatureVitamins & MineralsDigestive HealthDigestive HealthDigestive HealthDigestive Health
Special DietN/AN/ANaturalOrganic, NaturalN/A
Food FormSupplementSupplementSupplementSupplementSupplement

Questions & Answers

13 Customer Questions

How many daily doses are available in this 4 oz bottle, given a dropper each day?
Answer by ChewyJul 02, 2020
This 4-ounce bottle contains 120 milliliters. For cats and small dogs, give 1 milliliter per day. For medium sized dogs (25-50 pounds), give 2 milliliters per day. For large sized dogs (50-100 pounds), give 3 milliliters per day.

What is the protein source of the liver flavor? Is it of one pork source or is the liver and bacon flavoring artificial?
Answer by ChewyFeb 24, 2021
The liver flavoring in the RxB12 is a natural beef liver flavoring. The flavoring is hydrolyzed, meaning that the proteins have been broken down into the component amino acids. Thus, there are no proteins in the flavoring that can trigger an allergy.

Does this supplement require a vet's prescription?
Answer by ChewyAug 21, 2019
This supplement does not require an approval from your veterinarian. However, each pet is unique so we encourage you to seek professional guidance to select the best products along with their current health.

One of the inactive ingredients in this supplement is fructose which is supposed to be toxic for felines. Is it safe for cats?
Answer by ChewyJan 24, 2022
Regarding your question, the RxB12 is very safe for use on cats. The fructose is part of the flavoring system. The use of the Rx B12 is not recommended on diabetic patients.

ReviewsWrite a Review

Rated 4.0857 out of 5 stars
35 Reviews
Would recommend to a friend

35 Customer Reviews

Rated 3 out of 5 stars
By meowwow on Apr 16, 2022
Top 250 Contributor

Didn't work for me

My vet looked on chewy and suggested this product as my cat had become B-12 deficient, and it was the correct dosage. However, though it claims to be "palatable", and though my cat will take pills easily, he threw this cherry red kinda' sticky liquid all over me, him, and the house for 10 days, actually swallowing little. I had to have a compounding pharmacy make him some chews instead.

Rated 5 out of 5 stars
By Ellie on Mar 7, 2022

Great liquid B12!

I give RxB12 to my 13 yr. old cat with a syringe every morning and he is eating much more food now. Although he doesn't like the syringe being forced on him I hold him and my husband squirts it in his mouth then he is on his way to eat. I highly recommend it, that is the only way I can get him to take it as I tried it in his food and he won't eat it that way. I wish there was a smaller syringe to buy from Chewy though, the one I bought won't fit in the bottle so I have to put some in a cup and I am wasting some every time, but I don't care as long as it works.

Rated 5 out of 5 stars
By 4marta on Apr 7, 2022


I gave this to my 17year old cat with CKD he slept constantly and barely ate. I thought well I will see if he feels better and begins eating more. WOW! by 5 hours after giving it to him and my dog, they both became more active, hungry and playing! my dog is 11!

Rated 4 out of 5 stars
By NanV on Mar 20, 2022
Top 25 Contributor

Vet Recommended

My cat is having health issues and getting weekly B12 shots by my vet, however, shots only last a few days, so my vet recommended a B12 supplement. This is definitely helping to maintain my cat's health status. My reason for 4 stars though is the dropper doesn't fully fill for proper dosing, the liquid is thick and has an awful taste and the red color stains my cat's fur and anything it drips on.

Rated 5 out of 5 stars
By TANTAH on Jan 23, 2022

Senior dog remedy

Great for senior dog, over 16 yrs old! Gives him some energy to play a bit and increases his appetite. Very beneficial. Thank you for carrying this for him ,chewy!

Rated 5 out of 5 stars
By nifty on Oct 27, 2021

exactly what I wanted

My vet wanted me to bring in my cat every week for 6 wks for a B12 shot, and then every month. When the first shot turned her right around, and she was back to her normal behavior, I elected to buy a liquid version of B12. I found it on Chewy, and I didn't need approval from my vet in order to get it. I put it in her water, and she loves it. She drinks her water as if there was nothing added to it. I Thank-You for having it available, you saved me a lot of money on vet bills

Rated 5 out of 5 stars
By Jill on Oct 7, 2021

Highly Recommend

I never write reviews but this product changed my cats life! My 9 year old cat had unexplainable weight loss and loss of appetite. After multiple trips to the vet, the vet recommend weekly or monthly vitamin B shots. I instead searched for a supplement and came across this. My cat LOVES it and has gained weight and now has a healthy appetite. He has so much more energy and playfulness as well!

Rated 1 out of 5 stars
By Susie on Oct 16, 2021

BLAH.... Yucky

My person has tried putting these in everything I like, but it turns the good stuff bad. I just won't take these.

Rated 5 out of 5 stars
By Loretta on Jul 4, 2021

Awesome product and so easy !

My whippet has some serious health issues going on and is taking lots of meds a day. His B-12 level is low and he was getting weekly shots which was pretty costly along with his other meds. This supplement is tasty and easy to give and he looks forward to getting it every day.

Rated 2 out of 5 stars
By Rustysmom on Jul 16, 2021
Top 500 Contributor

Not Cat Approved

Was hoping this would be a great appetite stimulant for my cat but he will not tolerate the taste of it. Tried disguising it several different ways but he refuses it. Why can't they make things tasty for cats?