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

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At a Glance

  • Vitamins & Minerals
  • All Lifestages
  • All Breeds
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$35.69 Chewy Price
($8.93 /fl oz)
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About This Item

Details

  • 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).

Ingredient Information

Instructions

FAQ

Frequently bought together

Questions & Answers

11 Customer Questions

How many daily doses are available in this 4 oz bottle, given a dropper each day?

Answer by Chewy • Jul 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.

Can I put the RX B12 into my cats wet food.

Answer by Chewy • Sep 01, 2021
The Rx B12 can be mixed with either wet or dry food. This is the preferred way to administer the product. It needs to be given with food and not on an empty stomach.

Does this supplement require a vet's prescription?

Answer by Chewy • Aug 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.

Can you give this through a syringe and not on food? My cat don’t mind taking stuff on a syringe. I didn’t know if it needs diluted ??

Answer by Chewy • Aug 04, 2021
This supplement can be given orally through a syringe. It is best given with food or around a meal. Like all vitamins, it requires food in the stomach to ensure proper absorption and utilization. It can be given concurrently with other medications as it will not contraindicate or interfere with the efficacy of any drug. It is a water soluble vitamin. The bottle does not require shaking.
Reviews
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4.4
Rated 4.4 out of 5 stars
242 Ratings
Terms & Conditions

Customers Mention

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

Effectiveness

77% Positive

Form and Administration

79% Positive

Ingredients

81% Positive

Nutritional Value

82% Positive

115 Customer Reviews

Rated 2 out of 5 stars
By Suzanne on Dec 24, 2025

It’s deep red and she won’t eat it

I suppose the color doesn’t really matter, but I found it kind of weird, and you certainly can’t disguise it in food. I tried mixing it with wet food, with broths

I suppose the color doesn’t really matter, but I found it kind of weird, and you certainly can’t disguise it in food. I tried mixing it with wet food, with broths and bisques - no matter how much I tried to integrate it, she won’t touch the treated food. Groan. And the dropper is sort of fiddly, difficult to get a full 1ml dose into it. I ended up using two half-doses, but you shouldn’t have to do that. Luckily, Chewy was very understanding and refunded the cost. Bottom line: it may be a fine product but it didn’t work for my situation.

Rated 4 out of 5 stars
By Kelly on Dec 22, 2025

Bright red and it smells weird but it's affordable

I wish it wasn't bright red since I'm afraid it's going to stain my clothing one of these days! It smells really strong and weird but my cat ate it, mixed in with

I wish it wasn't bright red since I'm afraid it's going to stain my clothing one of these days! It smells really strong and weird but my cat ate it, mixed in with his wet food (rabbit). It's more affordable than alternatives. I find it difficult to suck up 1 ml at one time for some reason, but there's a measure mark for 0.5 ml so i do that twice.

Rated 4 out of 5 stars
By Jean on Dec 27, 2025

Trying this instead of B12 shots by the vet

I don't know if it's the taste or the dropper squirting into her mouth, but she's not a fan. Smells a bit like bacon or something smoked.

I don't know if it's the taste or the dropper squirting into her mouth, but she's not a fan. Smells a bit like bacon or something smoked.

Rated 5 out of 5 stars
By Amela on Jan 6, 2026

dog loves it

So far, the dog is taking it with gusto, and the stool looks ok. she is 11 year old shitzu with GI issues

So far, the dog is taking it with gusto, and the stool looks ok. she is 11 year old shitzu with GI issues

Rated 5 out of 5 stars
By Donna on Aug 28, 2025

It's a miracle worker for us

We have a senior dog and for two years I've been working with chewy trying to find something that he would like to eat he's lost so much weight he's been to the

We have a senior dog and for two years I've been working with chewy trying to find something that he would like to eat he's lost so much weight he's been to the vet so many times he's just an old dog and he's picky he can't see very well and he can't hear very well and he's been on heart medication now for probably 15 years when we found him he was a stray and he had heartworms which caused a murmur but we couldn't find anything for him to eat that he would be interested in eating-well this has helped he won't take pills he stopped taking pills a year ago so now all of his medication is given to him through a syringe no needle on it just the feeding syringe and I gave him 1 ml of this B12 once a day for 3 days and it has been a miracle worker he is running around like a new puppy he's eating so much that he's just like a little piggy we have seen such a good difference and him that now we're going to get some B12 for us we're too old dogs too and we thought if it'll help him that much and we have done everything from organic to just grass-fed beef I mean we've done everything and chewy's been working with us for a couple years this B12 has given him a new life and it's given us just watching him do so much better a happier life. From the second day that he was getting this and I was giving him just that one milliliter once a day and he's a new pup so I love it and I can't say enough good about it

Rated 4 out of 5 stars
By Linda on Dec 3, 2025

My dog wouldn't take it

We tried adding to dogs but she wouldn't eat it. We ended up buying prescription injections from vet

We tried adding to dogs but she wouldn't eat it. We ended up buying prescription injections from vet

Rated 3 out of 5 stars
By Deborah on Jan 16, 2026
Top 100 Contributor

Ease of use

My Cooper has digestive issues and hopefully this will help.

My Cooper has digestive issues and hopefully this will help.

Rated 5 out of 5 stars
By Carol on Sep 21, 2025

Cat likes

We have a picky 18 yo and he loves this supplement. It really helped him stop litter eating and no need for shot from vet. He is so picky and loves this.

We have a picky 18 yo and he loves this supplement. It really helped him stop litter eating and no need for shot from vet. He is so picky and loves this.

Rated 5 out of 5 stars
By Sharon on Dec 19, 2025

Good All around: Appetite, coat, put weight on.

Drops easy to give with a separate dropper. Put right in mouth

Drops easy to give with a separate dropper. Put right in mouth

Rated 5 out of 5 stars
By Bobbi on Sep 9, 2025

Great Product

Cody was getting B12 shots every so often at the Vet when his Veterinarian suggested this product. She said it works great and he can take it every day.

Cody was getting B12 shots every so often at the Vet when his Veterinarian suggested this product. She said it works great and he can take it every day.