RX VITAMINS Rx D3 Liquid Immune Supplement for Cats & Dogs, 2-oz bottle - Chewy.com

Rx Vitamins Rx D3 Liquid Immune Supplement for Cats & Dogs, 2-oz bottle

By Rx Vitamins
Rated 3.9286 out of 5 stars
$22.00Chewy Price
$20.90Autoship Price
Autoship (Save an extra 5%)

Why Autoship?

  • Save 5% on all future Autoship orders
  • Set your schedule based on your pet's needs
  • No fees, no commitments - skip, change or cancel anytime.

In Stock
FREE 1-3 day shipping over $49

About This Item


  • Helps provide your pet with a boost of vitamin D3 from cholecalciferol.
  • Supports your sidekick’s immune system and helps her body absorb phosphorus and calcium more easily.
  • Suitable for both cats and dogs.
  • Expertly crafted by a veterinarian.
  • Carries the National Animal Supplement Council Seal (NASC).

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Nutritional Information

Feeding Instructions


Questions & Answers

7 Customer Questions

Is this a naturally derived Vitamin D or synthetic?
Answer by ChewyDec 21, 2019
RxD3 contains pure Vitamin D3 in the form of cholecalciferol.

My 5 year old dog weighs 16 pounds. How much of a dropperful would I put in his food twice daily?
Answer by ChewyOct 20, 2020
It suggests giving one drop daily.

My vet wants my cockatoo to take vitamin D 100-200 iu. Your liquid vitamin D is 3000 iu. Is that the total amount in jar and what does one drop hold in iu’s?
Answer by ChewyAug 06, 2020
One drop of this supplement contains 100 IU and 3000 IU per ml.

Where is this manufactured? And are all of the ingredients from the US?
Answer by ChewyAug 01, 2022
This supplement is manufactured in New York, USA. The raw materials are sourced from the USA, Germany, France, Japan and Spain.

ReviewsWrite a Review

Rated 3.9286 out of 5 stars
14 Reviews
Would recommend to a friend

14 Customer Reviews

Filter by reviews that mention

Rated 5 out of 5 stars
By Charcoalsmom on Mar 15, 2023

Rx Vitamins - great products

My dog’s holistic vet recommended this product after his D/Mg/B-12 testing came back. I was hesitant to buy because sometimes packaging from Chewy is crummy and the item ends up damaged or broken. The reviews here mentioned issues with the stopper and receiving a loose bottle in a larger box. Chewy was $10 cheaper than the veterinary website so I decided to take a chance knowing that Chewy would make it right if error occurred on their behalf. Surprisingly, the little bottle was wrapped in thick bubble wrap. So while being shipped in a larger box, it was very secure and undamaged. It looks like Chewy is reading feedback and adjusting their shipping procedures. The drops are palatable to my dog and easy to dispense. No issue with the dropper system. The dropper has milliliter markings on it if needed. Overall, I’ve used other products from this brand and had success. Use at the recommended dosage by your veterinarian and retest as needed to ensure proper levels for your pet.

Rated 3 out of 5 stars
By Britt on Nov 27, 2022

Vitamin D3

Customer service was excellent as always. Delivery was super fast. The only issue is that the product leaks.

Rated 1 out of 5 stars
By Lisa on Dec 25, 2022

bad Bottles

The droppers come apart all the time. You end up wasting almost 3/4 bottle

Rated 5 out of 5 stars
By Sharon on Aug 13, 2022

Vitamin D for my cat

I started putting two drops in his meds. I stopped because he’s vomiting and I’m not sure why. I’ll try again later. I love every item that I get from you.”

Rated 5 out of 5 stars
By Bella on Jul 21, 2022

Vitamin D3 for our Huskey

We just started using this product several months ago for our almost 14yr old huskey.. Our girl loves it... Def recommend this and this brand.

Rated 4 out of 5 stars
By Janet on Apr 25, 2022

RX vitamin D3

I give this to both of my dogs every day but would love for the dropper to last instead of breaking half way thru the bottle. Can you make it more durable?? It’s really hard to make it thru the whole bottle with a broken top!!

Rated 4 out of 5 stars
By Lovecats880 on Jan 23, 2022

Looks healthy

I’m sorry I try to post my questions here before I purchase and it makes constantly error. I have 2 years old cat, 17 lbs and he is under weight control plan. 1. My cat is healthy but my apartment has no sunlight at all. Can I give him for help of sunlight which is vitamin D? 2. I feed him a lysine in wet food in the morning for his immune health. Can I give this one drop in wet food in the evening? Please answer me

Rated 5 out of 5 stars
By Steff on Dec 7, 2021

Packaging Items

I purchased this medication for my cat. The box was toooo big for the amount of bottles ordered (8) wrapped in paper but loosly rattling around in the box. The bottles are glass and I was surprised none were broken, Considering the trip, delivery, and banging around while in process. I would suggest bundling these bottles in bubble wrap as the product itself does not come boxed.

Rated 1 out of 5 stars
By MARGARET on Feb 7, 2022

Dropper falls apart

I don't even get through a quarter of the bottle every time before the top of the dropper separates from the plastic top. I have to throw away most of it and get a new one. It would be nice if the material was more durable.

Rated 5 out of 5 stars
By PugMom on Feb 16, 2021

Just like I get from my vet

I was happy to get on autodelivery of this medication since my dog needs to be on this going forward. This is exactly the same as I get from the vet. Super convenient. Yes, the dropper top is not well made and as you use the bottle the dropper cover fails. The mfg should do something about this issue for sure.