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evidence · mechanism · dose
Supplements/Vitamin

Adenosylcobalamin (B12)

Mitochondrial coenzyme form of B12 — partners with methylcobalamin for full B12 status.

Energy ProductionGeneral Wellness

Overview

Mitochondrial coenzyme form of B12 — partners with methylcobalamin for full B12 status.

Natural sources
    Common forms

      Forms & variants of Vitamin B12

      Different chemical forms of Vitamin B12 behave differently. Browse each form's mechanism, bioavailability, and best-use context.

      Parent
      Vitamin B12

      Essential cobalamin for methylation, red blood cell formation, and myelin maintenance.

      Methylcobalamin
      Methylcobalamin (B12)

      Active methyl-form of B12 — directly usable in the methylation cycle.

      Hydroxocobalamin
      Hydroxocobalamin (B12)

      Long-acting injectable form of B12 — used clinically for deficiency and cyanide poisoning.

      Mechanism of action

      Cofactor for methylmalonyl-CoA mutase in mitochondria — required for fatty acid and BCAA metabolism.

      Pathways
      • · Methylmalonyl-CoA mutase
      • · Mitochondrial energy metabolism

      Effects on the body

      Organ system effects

      Evidence-based benefits

      Lowers methylmalonic acid (functional B12 marker)

      Moderate evidence

      Potential side effects

      Common
        Rare
          Serious

            Drug interactions

            No notable interactions reported.

            Supplement interactions

            Pairs well with

            None listed.

            Avoid combining with

            No specific avoidances listed.

            Dosing & bioavailability

            Typical dose
            1000 mcg sublingual
            With food?
            Optional

            Where to buy

            Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

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            Thorne
            Practitioner-grade · NSF tested

            Scientific evidence (8)

            Systematic reviewJ Inherit Metab Dis · 2019

            Cobalamin metabolism and adenosylcobalamin in mitochondrial function

            Froese DS, et al.

            Review of B12 forms in mitochondrial metabolism.

            Key findings

            AdoCbl required for methylmalonyl-CoA mutase activity.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Adenosylcobalamin (B12) — Lowers methylmalonic acid

            Live PubMed search

            Live results for "Adenosylcobalamin (B12) Lowers methylmalonic acid" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Adenosylcobalamin (B12) and "Lowers methylmalonic acid". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Adenosylcobalamin (B12) — randomized controlled trial

            Live PubMed search

            Live results for "Adenosylcobalamin (B12) randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Adenosylcobalamin (B12) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Adenosylcobalamin (B12) — meta-analysis

            Live PubMed search

            Live results for "Adenosylcobalamin (B12) meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Adenosylcobalamin (B12) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Adenosylcobalamin (B12) — pharmacokinetics

            Live PubMed search

            Live results for "Adenosylcobalamin (B12) pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Adenosylcobalamin (B12) and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Adenosylcobalamin (B12) — safety adverse events

            Live PubMed search

            Live results for "Adenosylcobalamin (B12) safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Adenosylcobalamin (B12) and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewPubMed (NLM) · 1970

            PubMed: Adenosylcobalamin (B12) — dose response

            Live PubMed search

            Live results for "Adenosylcobalamin (B12) dose response" across the PubMed/MEDLINE peer-reviewed index.

            Key findings

            Opens current human and preclinical literature matching Adenosylcobalamin (B12) and "dose response". Filter by RCT, meta-analysis, or year on the results page.

            Open study
            Systematic reviewGoogle Scholar · 1970

            Google Scholar: Adenosylcobalamin (B12) — clinical evidence

            Live Scholar search

            Cross-database citation index for Adenosylcobalamin (B12) as it relates to "clinical evidence".

            Key findings

            Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

            Open study
            Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.