Rx Vitamins Rx D3 – Cat & Dog Vitamins Liquid D3 Drops in MCT Oil – Vitamin D for Dogs & Cats to Manage Deficiency – Aids in Dog Immune Support and Calcium Absorption – Pet Vitamin D3-2oz
$21.83
Price: $21.83
(as of Oct 19, 2025 11:31:19 UTC – Details)
From the brand
Nutritional Formulations
Rx Vitamins for Pets provides veterinarians with nutritional formulations designed to enhance patient outcomes. Since 1998, Rx Vitamins has set the standard in the development of safe, well-researched formulas. We support veterinarians by providing a wide choice of treatment options to complement the conventional care of companion animals.
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Package Dimensions : 4.49 x 1.73 x 1.5 inches; 4.73 ounces
Item model number : P-RX8816
Date First Available : May 28, 2025
Manufacturer : Rx Vitamins
ASIN : B0DTV7DL9R
Best Sellers Rank: #24,708 in Pet Supplies (See Top 100 in Pet Supplies) #210 in Dog Multivitamins
Customer Reviews: 4.6 4.6 out of 5 stars 41 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Bone Health Support – This cat and dog vitamin D3 with pure cholecalciferol aids calcium absorption, making it a great companion to a calcium supplement for dogs and cats and ideal dog vitamins for bones.
Kidney Care – Our dog supplement and cat vitamin with pure Vitamin D3 helps support kidney function and overall wellness, making them ideal for kidney problems in dogs and cats.
Immunity Booster – Support your pet’s defenses with this dog immune booster & cat immune support, designed to strengthen immune health and keep your beloved pets active and healthy at any life stage.
Enhanced Absorption – Formulated with MCT oil for faster and safe nutrient delivery, Rx Vitamins Rx D3 dog supplements support calcium balance, bone strength, and kidney health in both dogs and cats.
Quick and Convenient – Designed for hassle-free use, Rx D3 liquid vitamins for dogs and cats come with a precise dropper, ensuring accurate dosing for pets of all sizes and needs.
8 reviews for Rx Vitamins Rx D3 – Cat & Dog Vitamins Liquid D3 Drops in MCT Oil – Vitamin D for Dogs & Cats to Manage Deficiency – Aids in Dog Immune Support and Calcium Absorption – Pet Vitamin D3-2oz
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$21.83
john adams –
Easy to give and great quality!
I started using this liquid vitamin D3 for my dog a few months ago, and Iâm really happy with it. Itâs easy to measure out the right dose with the dropper, and my dog doesnât seem to mind the taste at all â I just mix it in with his food, and he eats it like normal.The bottle lasts a long time, and I like that itâs a liquid form since it absorbs better and is easier than trying to give pills. I noticed my dogâs coat looks shinier, and his energy level has been great since starting it.I appreciate that the ingredients are simple and clearly labeled. It gives me peace of mind knowing heâs getting a good quality supplement.
Eric Patterson –
This stuff works
My French bulldog had a vitamin d deficiency. One drop of this mixed in his food twice per day for a few weeks and he now has perfect vitamin d levels. Thank You
Teacher on a Budget –
FIV Cat Essentials
Why did you pick this product vs others?:I was happy to find this product on Amazon vs. a more expensive option elsewhere. My cat requires these drops daily, and I love that I can expect Amazon to ship this product quickly and at an affordable price.Â
Patti –
Had to Mix it in with Their Soft Food
I started using Rx Vitamins Rx D3 drops for my cats and dogs to help manage vitamin D levels and support calcium absorption. Overall itâs a solid, practical supplementâI’m giving it 4 stars.What I liked- Formula & delivery: The liquid D3 in MCT oil is easy to dose precisely with a syringe/dropper, which is great for small pets or adjustable dosing. The oil carrier makes the vitamin bioavailable and simple to add to food.- Purposeful: Itâs convenient for addressing suspected or diagnosed vitamin D deficiency and supports calcium metabolism, which can be helpful when recommended by a vet.- Packaging & size: The 2 oz bottle is easy to store and the dropper gives good control for small incrementsâuseful for cats and small dogs.- No fuss dosing: For pets that donât mind oral drops, itâs quick to administer without complicated mixing.What held it back- Palatability with cats: My cats can taste the oil, so I have to mix the drops well into soft food to mask the flavor. If you have picky eaters, expect a bit of work to get them to accept it.- Oiliness: The MCT oil can leave a slight oily residue on fur/whiskers if given directly, so mixing into food or using a tiny amount is best.- Vet oversight recommended: As with any vitamin D product, dosing should be guided by your veterinarianâtoo much vitamin D can be harmful, so plan to confirm levels and follow vet dosing instructions.- Price/value: Itâs a small bottle, so for long-term use the cost can add up depending on your petâs required dose.Tips- Mix thoroughly into a small portion of tasty wet food or a favorite treat to mask the taste for finicky cats.- Use the dropper to measure doses precisely and keep a dosing log.- Consult your vet for baseline blood levels and follow-up testing to avoid overdosing.- Store in a cool, dry place and follow the productâs storage instructions.Bottom lineA useful, easy-to-dose vitamin D3 liquid thatâs effective when used under veterinary guidance. Works well for supporting calcium absorption and addressing deficiency, though expect to mix carefully for picky cats. Four stars for convenience and formulation, with the caveat to monitor dosing and palatability.
Mike Gilligan –
Possible Stomach Upset
Made our lab throw up when mixed with her food.
terri collins –
Our dog never noticed this was in his food.
Our puppy has a deficiency in Vit D. He ate this in his food without even noticing it. And we’ve seen great results.
Jolene H. –
A helpful supplement to your dog’s health!
I learned from a holistic veterinarian when my boy dog was sick that in many cases of disease, dogs are deficient in Vitamin D. Full disclosure: if you are going to administer this Vitamin D supplement with the intention of correcting a deficiency, there is a test to determine the level of Vitamin D that currently exists in your dog’s system. This test should serve as a guide to determine how much Vitamin D will be needed, and the test should be repeated frequently — I’m thinking once a month at least — to ensure your dog’s Vitamin D levels are within a safe range.This is a high-quality supplement that helped my boy dog live for 10 months with lymphoma, and the only other “treatment” he received was an overhaul of his diet to Dr. Harvey’s Paradigm and traditional Chinese veterinary medicine supplements.This is a great value as only a few drops are usually required per day. It’s easy to drop the drops into your dog’s food, and they will never ever notice. This supplement can be an important and helpful component to your dog’s health and recovery. I do recommend that you consult a holistic veterinarian for the best advice and guidance about how best to use this supplement!
Shantilly Place –
And often forgotten vitamin that is much needed by pets and people alike
Well, I’m definitely not a dog or cat, so I cannot attest to the taste or any other direct relative type of response one might be curious about. It seems to be effective, has a nice clear solution that appears to be very clean and of good quality. I’m sure that the benefits of this are great for their health and energy. They do not turn away from it so the taste must be okay for them! The price is a little higher than some others, but it’s within the range of being along the same lines.