Vitamin B12
Research Reliability -
A methylated B12 supplement that boosts energy production, supports nerve health, and aids red blood cell formation.
Appetite
Mood
Sleep
Vitamin B12
Description
Vitamin B12 is essential for neurological function, DNA synthesis, and the production of red blood cells. Deficiency is particularly common in vegans, older adults, and those taking acid-reducing medications. This formula uses methylcobalamin, the bioactive form that bypasses the conversion step required by cyanocobalamin, making it suitable for people with MTHFR gene variants. It supports sustained energy, mental clarity, mood stability, and healthy homocysteine metabolism.
Effects
Week 1
if you were low, energy and mental fog start lifting
Weeks 1–2
clearer, more consistent daytime energy
Months
neurological benefits take longest to show
How it Feels
If you were deficient, this one you can feel: a lift in energy and a lighter head within a week or two. If your levels were already fine, expect nothing. It will not act like a stimulant either way.
Usage
Entry Dose
500mcg
Standard Dose
1000mcg
Max Dose
5000mcg
Onset
1–2 weeks (energy); months (neuro)
Combinations
Pairs well with
Synergistic
5-MTHF (folate) — methylation cycle cofactors; work together to lower homocysteine
Vitamin B6 (P5P) — completes the homocysteine-to-cysteine conversion pathway
Magnesium — supports methylation enzyme activity downstream of B12
Avoid combining
Contraindicated
Metformin (long-term) — drug depletes B12 via intrinsic factor interference
Proton pump inhibitors — reduce gastric acid needed for B12 absorption from food
Biomarkers to Track
Subjective
(Daily)
Energy and mental clarity (1–10)
Tingling or numbness in extremities
Mood and motivation score
Objective
(Quarterly)
Serum B12 level
Homocysteine level
MMA (methylmalonic acid) level
Very safe with no known toxicity ceiling, since excess is excreted.
Almost no one, though rare conditions warrant a doctor's input.
Buying the cheap cyanocobalamin form when methyl absorbs better, and expecting an energy boost if you were never deficient.
Strong (human RCTs / meta-analyses)
Evidence is strongest for correcting diagnosed deficiency or pernicious anemia, not for general energy claims in non-deficient people.
Devalia V et al. (2014). British Journal of Haematology. Clinical guideline (B12 deficiency). PMID: 24942828.