What is the best form of vitamin b12?
4 forms compared by what actually reaches your bloodstream. Absorption ranges from 70% to 85% — a difference that matters more than the milligrams on the label.
Ranked by absorption
Higher means more of the dose reaches youShort answer
Vitamin B12 (Methylcobalamin) absorbs best — 85%.
Energy & nerve support. Typical dose 500-1000 mcg, about $15 a month. The cheapest option is Vitamin B12 (Cyanocobalamin) at $8, but it only absorbs at 70%.
Every form side by side
| Form | Absorbed | Safety | Per month | Dose | Evidence |
|---|---|---|---|---|---|
| Vitamin B12 (Methylcobalamin) | 85% | 10/10 | $15 | 500-1000 mcg | A |
| Vitamin B12 (Adenosylcobalamin) | 80% | 10/10 | $60 | 1000-3000 mcg | B |
| Vitamin B12 (Hydroxocobalamin) | 75% | 10/10 | $35 | 500-1500 mcg | A |
| Vitamin B12 (Cyanocobalamin) | 70% | 9/10 | $8 | 250-1000 mcg | A |
Head to head
How to read this
- Absorption is the share of the dose that reaches your bloodstream — the number that decides whether the milligrams on the label mean anything.
- A cheaper form at half the absorption is not cheaper per unit delivered.
- Safety here reflects tolerance at normal doses, not toxicity risk.
- Evidence A means the form itself was studied, not just the parent compound.
Common questions
What is the best form of vitamin b12?
Vitamin B12 (Methylcobalamin) — it absorbs at 85%, the highest of the 4 forms here. Energy & nerve support. Typical dose 500-1000 mcg.
Which form of vitamin b12 is worst absorbed?
Vitamin B12 (Cyanocobalamin) at 70%. It is usually the cheapest option, which is exactly why it ends up in budget products.
Is the expensive form of vitamin b12 worth it?
Compare per unit delivered, not per bottle. Vitamin B12 (Cyanocobalamin) costs $8 a month at 70% absorption, Vitamin B12 (Methylcobalamin) costs $15 at 85%.
How much vitamin b12 should you take?
Doses differ by form: Vitamin B12 (Methylcobalamin) 500-1000 mcg; Vitamin B12 (Adenosylcobalamin) 1000-3000 mcg; Vitamin B12 (Hydroxocobalamin) 500-1500 mcg; Vitamin B12 (Cyanocobalamin) 250-1000 mcg.