Cyanocobalamin vs vitamin B12: what’s the difference?

If you’ve been looking into vitamin B12 supplements, chances are you’ve come across the word cyanocobalamin. It might sound complicated, but it’s simply one of the most common forms of vitamin B12 used in supplements and fortified foods.

Cyanocobalamin is a man-made form of vitamin B12.¹ It’s commonly used in supplements, fortified foods and some prescribed treatments for low vitamin B12 levels. Once absorbed by the body, cyanocobalamin is converted into active forms of vitamin B12 that your body can use.¹

“Vitamin B12 helps your body release energy for the food you eat and supports psychological function and the formation of healthy red blood cells, yet low levels can often go unnoticed at first,” says Olivia. “Cyanocobalamin is a widely used synthetic version of vitamin B12 that can help maintain adequate levels when dietary intake or absorption is reduced.”

Vitamin B12 is the name for a group of compounds that help support important functions in the body. Cyanocobalamin is the synthetic version of vitamin B12. Other forms of B12 include methylcobalamin,² hydroxocobalamin 2 and adenosylcobalamin.²

Vitamin B12 supports several important functions in the body. Approved health claims for vitamin B12 include supporting normal:

“For many people, including older adults, those following plant-based diets and people with absorption difficulties, cyanocobalamin can be a practical way to maintain adequate vitamin B12 levels,” says Olivia. You may need support from supplementation if you’re:

Low vitamin B12 can happen for several reasons. Common causes include:^6,7

“Symptoms of low vitamin B12 can develop gradually and are often mistaken for everyday fatigue or stress,” says Olivia. “Rather than self-diagnosing, it’s best to speak to a healthcare professional if you’re concerned about your symptoms or risk factors.”

The amount of cyanocobalamin you need depends on your age, diet and individual health needs. In the UK, the recommended nutrient intake (RNI) for adults aged 19–64 is around 1.5 micrograms of vitamin B12 per day.⁸ Many supplements contain higher amounts because vitamin B12 isn’t always fully absorbed by the body. Always follow the dosage instructions on the product packaging or advice from your healthcare professional. If you’ve been prescribed cyanocobalamin tablets or injections, follow your prescription exactly.

“Cyanocobalamin is generally considered safe and well tolerated when taken as directed, with most people experiencing few or no side effects,” says Olivia. “As vitamin B12 is water-soluble, excess amounts are typically excreted through urine rather than stored by the body.”⁹

Cyanocobalamin is a widely used form of vitamin B12 that can help support healthy vitamin B12 levels when supplementation is needed. While many people can get enough through their diet, some may benefit from additional support through supplements or a prescribed dose.

Disclaimer – This article provides informational advice and is not a substitute for medical care. Working with experts for accuracy, we take great care to ensure the information is up-to-date and relevant. However, you should always consult your GP or healthcare professional before using supplements or alternative products, particularly if you have medical conditions or are under supervision.