◂ Library/Essential Vitamin
Essential Vitamin⚜ Compound

Cyanocobalamin

01 / OVERVIEW

What this compound does

WHAT IT DOES

Cyanocobalamin is a man-made version of vitamin B12 that your body needs to make red blood cells, keep your nerves healthy, and help release energy from food. It’s often used by people who don’t get enough B12 from their diet, like vegans or older adults. Taking it can help prevent tiredness, brain fog, and nerve problems linked to low B12 levels.

KEY BENEFITS
Supports healthy red blood cell formation
Keeps nerves working properly
Helps the body use energy from food
Promotes brain function and memory
May prevent mood swings related to deficiency
BEST FOR
  • • Vegans and vegetarians who lack B12 in diet
  • • Older adults with reduced absorption
  • • People with pernicious anemia or gastric bypass
  • • Individuals on long-term acid-reducing medications
WHAT TO EXPECT

If you are deficient, you may notice improved energy and mental clarity within a few weeks of daily supplementation. For non-deficient individuals, effects are subtle or absent.

WHO SHOULD AVOID THIS
  • • People with cobalt allergy
  • • Those with Leber's disease (optic atrophy)
  • • Rare cases of hypersensitivity to cyanocobalamin
MYTHS & FACTS
Myth: Vitamin B12 gives you instant energy even if you aren't deficient.
Fact: B12 only boosts energy if you are deficient. In people with adequate levels, extra B12 does not improve energy or athletic performance.
Myth: All forms of B12 are equally absorbed.
Fact: Cyanocobalamin is the most stable and widely studied form, but methylcobalamin is more directly active. However, cyanocobalamin is readily converted in the body and is highly effective for correcting deficiency.
Myth: You can get enough B12 from plant foods like seaweed or spirulina.
Fact: Plant foods contain B12 analogs that are mostly inactive. Reliable sources are animal products, fortified foods, or supplements.
✦ Card Stats
DOSE
500–1000 mcg/day
LOADING: 1000 mcg/day × 1–2 weeks for acute deficiency (under medical supervision)
Evidence
—
Studies indexed6
How it's made

Production details below.

03 / DOSAGE

How much, when

MAINTENANCE

500–1000 mcg/day

LOADING PROTOCOL

1000 mcg/day × 1–2 weeks for acute deficiency (under medical supervision)

Take with water on an empty stomach for optimal absorption; avoid taking with high-dose vitamin C simultaneously as it may degrade cobalamin. Sublingual or liquid formulations bypass GI absorption issues.

TIMING

Cyanocobalamin — Morning dose

Take with food (high-fat meal)

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 25671722

    Corrects B12 deficiency

    Oral cyanocobalamin (1000-2000 mcg/day) effectively normalizes serum B12 levels in deficient patients, with similar efficacy to intramuscular injections. Duration: 4-12 weeks. Sample size: >1000 across studies.

    A
  • PMID: 14565789

    Reduces homocysteine levels

    Supplementation with cyanocobalamin alone or combined with folate lowers plasma homocysteine by about 25% in populations with elevated levels. Sample size: ~500, duration: 8 weeks.

    A
  • PMID: 22377832

    Prevents cognitive decline

    B12 supplementation (500 mcg/day for 2 years) slowed cognitive decline in older adults with mild deficiency, but no benefit in those with normal levels. Sample size: 271, duration: 2 years.

    B
  • PMID: 15924877

    Improves mood in depression

    Adding B12 (1000 mcg/day) to antidepressant treatment improved mood scores in patients with suboptimal B12 levels. Sample size: 73, duration: 8 weeks.

    B
  • PMID: 2280194

    Supports erythropoiesis

    Cyanocobalamin therapy corrects megaloblastic anemia within 2-3 months in B12-deficient individuals, restoring hemoglobin levels to normal.

    A
  • PMID: 19805626

    Role in pregnancy outcomes

    Maternal B12 supplementation (50 mcg/day) reduced risk of neural tube defects in offspring when combined with folic acid. Sample size: ~1200, duration: pregnancy.

    B
  • PMID 16479441 · 2006Narrative Review

    Homocyst(e)ine and stroke

    B
  • PMID 31855498 · 2020RCT

    Dietary Supplement Use During Chemotherapy and Survival Outcomes of Patients With Breast Cancer Enrolled in a Cooperative Group Clinical Trial (SWOG S0221)

    B
  • PMID 32690472 · 2020RCT

    Brain delivery of supplemental docosahexaenoic acid (DHA): A randomized placebo-controlled clinical trial

    B
  • PMID 39083229 · 2024Narrative Review

    Ultra-high dose methylcobalamin and other emerging therapies for amyotrophic lateral sclerosis

    B
04 / INTERACTIONS

Medicine interactions

  • Metformin· antidiabetic

    Metformin reduces intestinal absorption of B12 over time.

    → Monitor B12 levels annually; consider 1000 mcg/day oral B12 if deficient.

    MODERATE

  • Proton Pump Inhibitors (PPIs)· PPI

    PPIs decrease stomach acid, impairing release of B12 from food and reducing absorption.

    → Use cyanocobalamin (not food-bound B12) and consider higher doses (1000 mcg/day).

    MODERATE

  • Chloramphenicol· antibiotic

    Chloramphenicol may interfere with B12's role in erythropoiesis.

    → Monitor blood counts; B12 supplementation may be needed in prolonged therapy.

    LOW

  • Colchicine· anti-gout

    Colchicine may inhibit B12 absorption via mucosal damage.

    → Check B12 levels with long-term use; supplement if low.

    LOW

This page is a reference summary, not a prescription. Consult a clinician before starting, stopping, or combining supplements — especially if you take medication or have a medical condition.