Yes, cyanocobalamin is vegan. It is produced entirely through bacterial fermentation, not extracted from animal tissue or any animal-derived ingredient. This makes it the most common form of vitamin B12 used in vegan supplements and fortified foods worldwide.
How Cyanocobalamin Is Made
Cyanocobalamin is manufactured in industrial fermentation tanks using bacteria, primarily species like Pseudomonas denitrificans and Propionibacterium shermanii. These microorganisms naturally synthesize vitamin B12 as part of their metabolism. The process uses plant-derived carbon sources such as maltose syrup and corn steep liquor, along with mineral precursors like cobalt ions. No animal products are involved at any stage of production.
The “cyano” in cyanocobalamin refers to a tiny cyanide molecule attached to the B12 structure. This sometimes raises concern, but the amount is negligible. A 1,000 microgram dose of cyanocobalamin releases roughly 20 to 40 micrograms of cyanide, which is far less than the naturally occurring cyanide you’d get from eating flaxseeds, drinking fresh apple juice, or snacking on apricots.
Why Vegans Need B12 Supplements
Vitamin B12 is essential for two critical processes in your body: converting homocysteine into the amino acid methionine, and helping metabolize certain fatty acids for energy production. A deficiency can lead to anemia, nerve damage, and cognitive problems over time. Plant-based diets are almost completely devoid of vitamin B12, so supplementation isn’t optional for vegans.
A daily dose of 50 to 100 micrograms of cyanocobalamin is commonly recommended for people on plant-based diets. Your body only absorbs a fraction of each dose (roughly 49% of a 1 microgram dose, with the percentage dropping as the dose increases), so higher supplement doses compensate for this limited uptake.
Cyanocobalamin vs. Methylcobalamin
Both cyanocobalamin and methylcobalamin are sold as B12 supplements, and both are vegan when produced through fermentation. They differ in how your body handles them. Cyanocobalamin is a “precursor” form: after you swallow it, your body strips off the cyanide molecule and converts it into the two active forms it actually uses, methylcobalamin and adenosylcobalamin.
Some supplement brands market methylcobalamin as the “active” or “natural” form, implying it’s superior. The evidence tells a different story. A study in vegan adults found that those supplementing with cyanocobalamin maintained significantly higher blood levels of active B12 (measured as holotranscobalamin) compared to those taking methylcobalamin. The cyanocobalamin group had a median holotranscobalamin level of 150 pmol/l versus 78.5 pmol/l in the methylcobalamin group, a statistically significant difference. While some research has noted that methylcobalamin may be excreted less in urine (suggesting better retention), the overall evidence favors cyanocobalamin for maintaining adequate B12 status in vegans.
Cyanocobalamin also tends to be cheaper and more widely available, which matters for a supplement you’ll be taking indefinitely.
Stability and Storage
One practical advantage of cyanocobalamin is its relative stability compared to other B12 forms. That said, it does degrade when exposed to light, and this breakdown accelerates in liquid formulations, especially when mixed with other B vitamins like riboflavin or vitamin C. Tablets and capsules stored in a cool, dark place hold up well through their shelf life. If you use a liquid B12 supplement or a multivitamin drink, keep it refrigerated and away from direct light to preserve potency.
Checking Your Supplement’s Vegan Status
While cyanocobalamin itself is always vegan, the final supplement might not be. Capsules made from gelatin, tablets with lactose as a filler, or softgels containing beeswax can make an otherwise vegan ingredient non-vegan. Look for supplements explicitly labeled “vegan” or check the inactive ingredients list for animal-derived components. Common vegan capsule materials include cellulose (labeled as “vegetable capsule” or “HPMC”) and tapioca starch.
Fortified foods like plant milks, nutritional yeast, and breakfast cereals almost always use cyanocobalamin as their B12 source. These provide a convenient way to build B12 into your daily diet without relying solely on a pill, though most vegans benefit from supplementing as well to ensure consistent intake.