Rx B12 is a liquid cyanocobalamin (vitamin B12) supplement made for easy oral administration, offering a palatable alternative to monthly injections. Made by RX Vitamins, the 120 ml bottle lasts about a month for larger pets and up to four months for smaller pets. Vitamin B12 supports normal energy metabolism, red blood cell production, and nervous system function. Use as directed by your veterinarian.

RX Vitamins

Rx B12

$35.69

Supports healthy vitamin B12 nutritional status
Supports normal energy metabolism and cellular function
Supports normal red blood cell and nerve function

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A Palatable Source of Pure, High Quality Cyanocobalamin

Vitamin B12 traditionally has been administered parenterally for chronic enteropathies and EPI. It can be challenging for clients to bring their pets in monthly for these injections. Recent studies have found that daily oral administration of cyanocobalamin will just as effectively increase serum cobalamin levels as monthly injections. Rx Vitamins proudly introduces Rx B12, in a highly palatable liquid format for easy and convenient oral administration of cyanocobalamin to your patients. The 120 ml bottle will supply a larger (>50 pounds) patient for a month, and for a patient less than 25 pounds it will last 4 months.

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Customer Reviews

What is Rx B12 used for in pets?

Rx B12 is a vitamin B12 supplement for pets formulated to provide nutritional support for healthy vitamin B12 levels. It helps support normal metabolic function and overall wellness as part of a balanced nutritional program.

What is the difference between Rx B12 and Rx B12 Forte?

Both products provide vitamin B12 supplementation for pets, while Rx B12 Forte offers a higher-strength formula. Your veterinarian can recommend the most appropriate option based on your pet's individual nutritional needs.

Why is vitamin B12 important for pets?

Vitamin B12 plays an important role in normal energy metabolism, red blood cell production, and nervous system function. Supplementation can help maintain healthy vitamin B12 levels in pets when recommended by a veterinarian.

When should Rx B12 or Rx B12 Forte be used?

Rx B12 and Rx B12 Forte are intended for pets that may benefit from additional vitamin B12 nutritional support. They should be used according to your veterinarian's recommendations as part of an overall health management plan.

How long does shipping take, and is shipping free?

Consumer orders ship free with no minimum purchase and typically arrive within 3–5 business days. Wholesale orders qualify for free shipping on purchases over $300. Tracking information is emailed as soon as your order ships, so you can follow its delivery progress.

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Liquid Vitamin B12 Supplement for Dogs and Cats

Rx Vitamins Rx B12 is a highly palatable liquid vitamin B12 supplement formulated for dogs and cats. Each 1 mL provides 250 mcg of cyanocobalamin, a form of vitamin B12 used to support healthy cobalamin status, normal metabolism, and overall nutritional wellness.

The oral liquid format makes Rx B12 easy to measure and administer at home according to your veterinarian's recommendations.

Rx B12 is supplied in a 4 fl oz / 120 mL bottle and is intended for canine and feline patients.

250 mcg Vitamin B12 per mL

Each 1 mL serving provides 250 mcg of vitamin B12 as cyanocobalamin.

This clearly defined concentration makes it easy to follow weight-based serving directions for dogs and cats.

What Is Cyanocobalamin?

Cyanocobalamin is a form of vitamin B12 used in nutritional supplements.

Vitamin B12 plays an important role in normal energy metabolism, red blood cell production, nervous system function, and overall nutritional status.

Rx B12 provides cyanocobalamin in an oral liquid format designed specifically for pets.

Supports Healthy Vitamin B12 Status

Rx B12 is recommended as an oral source of bioavailable cobalamin for dogs and cats.

The formula can be used as part of a veterinarian-guided nutritional plan when additional vitamin B12 support is appropriate.

Supports Normal Energy Metabolism

Vitamin B12 contributes to normal energy metabolism and cellular function.

Rx B12 provides a measured oral source of cyanocobalamin to support these normal nutritional processes.

Supports Normal Red Blood Cell and Nervous System Function

Vitamin B12 has an established nutritional role in normal red blood cell production and nervous system function.

Rx B12 is designed to provide targeted vitamin B12 support rather than functioning as a broad multivitamin.

Rx B12 for Dogs

Rx B12 is formulated for dogs and uses body-size-based serving directions.

The liquid format can be easier to administer than tablets or capsules for dogs that need daily oral vitamin B12 support.

Rx B12 for Cats

Rx B12 is also formulated for cats.

The current directions recommend a small measured daily serving, making the liquid format practical for feline patients.

Cats with ongoing gastrointestinal, appetite, or nutritional concerns should remain under veterinary supervision.

How Much Rx B12 Should I Give My Pet?

The current product directions are:

Cats and small dogs: 1 mL daily
Medium dogs, 25 to 50 lb: 2 mL daily
Large dogs, 50 to 100 lb: 3 mL daily

Always follow the current product label or your veterinarian's recommendation as the final reference for use.

4 fl oz / 120 mL Oral Liquid

Rx B12 is supplied in a 4 fl oz / 120 mL bottle.

How long one bottle lasts depends on your pet's daily serving amount.

The current manufacturer information notes that the bottle can last about one month for a larger patient and up to several months for smaller pets.

Rx B12 vs. Rx B12 Forte

Rx B12 and Rx B12 Forte both provide cyanocobalamin for dogs and cats, but they differ in concentration and bottle size.

Rx B12 provides 250 mcg of vitamin B12 per mL in a 4 fl oz / 120 mL bottle.

Rx B12 Forte provides a higher-strength 1,000 mcg of vitamin B12 per mL in a 2 fl oz / 60 mL bottle.

Your veterinarian can help determine which concentration is more appropriate for your pet's individual nutritional needs.

Rx B12 vs. a General Pet Multivitamin

Rx B12 is a targeted single-nutrient supplement rather than a broad daily multivitamin.

Its primary purpose is to provide a measured oral source of cyanocobalamin for dogs and cats that need additional vitamin B12 nutritional support.

Easy Oral Administration

Rx B12 is supplied as a highly palatable liquid, making daily oral administration straightforward for many dogs and cats.

Administer during or after your pet has eaten unless your veterinarian advises otherwise.

Important Use Considerations

Safe use in pregnant animals or animals intended for breeding has not been proven.

If your pet's condition worsens or does not improve, stop administration and consult your veterinarian.

An examination from a veterinarian is recommended before using this product.

For animal use only. Keep out of reach of children and other animals.

Choosing a Vitamin B12 Supplement for Dogs and Cats

When comparing vitamin B12 supplements for pets, consider the form of B12, concentration per mL, liquid or solid format, species labeling, serving directions, bottle size, and veterinary recommendations.

Rx B12 provides 250 mcg of cyanocobalamin per mL in a 4 fl oz liquid formula for dogs and cats.

Rx Vitamins Rx B12 4 fl oz

Rx Vitamins Rx B12 is a liquid cyanocobalamin supplement for dogs and cats formulated to support healthy vitamin B12 status, normal metabolism, red blood cell production, nervous system function, and overall nutritional wellness.

The 4 fl oz / 120 mL bottle provides 250 mcg of vitamin B12 per mL in an easy-to-administer oral liquid.

For pet owners searching for Rx B12, vitamin B12 for dogs, vitamin B12 for cats, or an oral cyanocobalamin supplement for pets, Rx B12 provides a clearly defined veterinary nutritional option.