Browse/Essential Vitamin
Essential Vitamin

Vitamin B12 (Methylcobalamin)

01 / OVERVIEW

What this compound does

WHAT IT DOES

Vitamin B12 is important for keeping your energy levels steady and supporting your brain health. It helps your body make red blood cells, which carry oxygen, and is essential for the proper functioning of your nervous system. If you're feeling tired or have trouble concentrating, it might be worth looking into your B12 levels.

KEY BENEFITS
Supports energy production
Promotes healthy brain function
Aids in red blood cell formation
Contributes to nerve health
May improve mood
BEST FOR
  • • Vegetarians and vegans who may lack B12
  • • Older adults with absorption issues
  • • Individuals with fatigue or low energy
  • • People with neurological concerns
  • • Those recovering from surgery
WHAT TO EXPECT

Users may start to feel more energetic and alert within a few days to weeks of taking B12. Improvements in mood and cognitive function may also be noticed as levels normalize.

WHO SHOULD AVOID THIS
  • • Individuals with certain rare genetic disorders
  • • Those allergic to cobalt or cobalamin
  • • People on specific medications that affect absorption
  • • Pregnant or breastfeeding women should consult a doctor
MYTHS & FACTS
Myth: Vitamin B12 can only be obtained from animal products.
Fact: While animal products are rich in B12, fortified foods and supplements provide adequate sources for those on plant-based diets.
Myth: All forms of B12 are equally effective.
Fact: Methylcobalamin is one of the active forms of B12 that may be better utilized by the body compared to other forms like cyanocobalamin.
At a glance
Typical dose
500-1000 mcg/day
Evidence
—
Studies indexed2
How it's made

Production details below.

Options to buy

Affiliate links — we may earn a commission at no extra cost to you.

03 / DOSAGE

How much, when

MAINTENANCE

500-1000 mcg/day

oral or sublingual; lab guided if deficient

TIMING

Vitamin B12 (Methylcobalamin) — Morning dose

Take on empty stomach

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 23356638

    Nerve function support

    Methylcobalamin supports myelin sheath maintenance and nerve conduction.

    A
  • PMID: 18838531

    Homocysteine reduction

    B12 combined with folate lowers elevated homocysteine, a cardiovascular risk marker.

    B
  • PMID 20350504 · 2010 · n=3511Cross-sectional

    Vitamin B12 Deficiency: Prevalence and Neurological Consequences

    B12 deficiency found in 6% of adults <60, up to 20% in older adults.

    A
  • PMID 19001767 · 2008Review

    Methylcobalamin vs Cyanocobalamin: Comparative Bioavailability

    Methylcobalamin is bioavailable and may have advantages for neurological conditions.

    B
04 / INTERACTIONS

Medicine interactions

  • Metformin· diabetes medication

    Metformin can reduce B12 absorption in the gut.

    → Monitor B12 levels regularly in patients taking Metformin.

    MODERATE

  • Proton Pump Inhibitors· stomach acid reducer

    These medications can impair B12 absorption by reducing stomach acid.

    → Consider B12 supplementation for long-term users.

    MODERATE

  • Antibiotics· broad-spectrum antibiotics

    Antibiotics may disrupt gut bacteria that produce B12.

    → Monitor for B12 deficiency during prolonged antibiotic use.

    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.