Vitamin B12 (Cyanocobalamin) vs Vitamin B12 (Hydroxocobalamin)
Two forms of the same compound. What differs is how much of it your body absorbs, how well you tolerate it and what it costs per month.
Side by side
Green marks the better value| Vitamin B12 (Cyanocobalamin) | Vitamin B12 (Hydroxocobalamin) | |
|---|---|---|
| Absorption score | 70/100 | 75/100 |
| Cost per 10 mg delivered | $6.1 | $15.56 |
| Safety rating | 9/10 | 10/10 |
| Cost per month | $8 | $35 |
| Daily dose | 250-1000 mcg | 500-1500 mcg |
| Best timing | Morning with food | Morning with food |
| Evidence level | A | A |
Verdict
Too close to call on the numbers.
Both forms score the same on the measurable metrics. Pick by tolerance and price.
What actually differs
Vitamin B12 (Cyanocobalamin)
Most stable and researched form of vitamin B12, requiring conversion to active forms in the body
- Most stable
- Least expensive
- Most research
- Long shelf life
- Requires conversion
- Contains cyanide group
- Lower bioactivity
Vitamin B12 (Hydroxocobalamin)
Natural form of vitamin B12 with superior retention and longest half-life, offering sustained B12 levels and excellent safety profile
- Natural form
- Superior retention
- Excellent safety
- Cyanide-free
- Higher cost
- Limited availability
- Needs conversion
- Less research than cyano
What helps
Vitamin B12 (Cyanocobalamin) → Vitamin B12 (Hydroxocobalamin)
Sequential steps in methylation pathway · level AVitamin B12 (Hydroxocobalamin) → Vitamin B12 (Cyanocobalamin)
Sequential enzymatic steps in methylation pathway · level AWhat each form is for
Same compound, but the dose, the ceiling and the record differVitamin B12 (Cyanocobalamin) — energy & nerve support.
Usual daily dose 250-1000 mcg, taken morning with food. It is named as the suspect product in 61 FDA reports. Evidence grade A.
Vitamin B12 (Hydroxocobalamin) — long-acting natural b12.
Usual daily dose 500-1500 mcg, taken morning with food. It is named as the suspect product in 61 FDA reports. Evidence grade A.
How these numbers are read
- The absorption score ranks forms of the same compound against each other. It is not a measured share of the dose — see how we derive it.
- Safety rating reflects tolerance at normal doses, not toxicity risk.
- Cost is per month at the typical daily dose, so a cheaper form taken at double the dose is not cheaper.
- Evidence level A means the form itself was studied, not just the parent compound.
Where to buy
Both forms deliver the same compound — pick by the numbers above, then check the label matches.
Affiliate links — we may earn a commission at no cost to you.
Common questions
Which is better, Vitamin B12 (Cyanocobalamin) or Vitamin B12 (Hydroxocobalamin)?
Vitamin B12 (Hydroxocobalamin) absorbs better — 75% against 70%. Absorption decides how much of the dose actually reaches you, so it usually matters more than the milligrams printed on the label.
What is the difference between Vitamin B12 (Cyanocobalamin) and Vitamin B12 (Hydroxocobalamin)?
Both deliver the same active compound. They differ in how well the body takes them up, how they are tolerated and what a month costs: $8 against $35.
Can you take Vitamin B12 (Cyanocobalamin) and Vitamin B12 (Hydroxocobalamin) together?
You can, but there is rarely a reason to. Two forms of the same compound stack the same active dose, so the usual approach is to pick the better absorbed one and dose it properly.