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B-Complex (Methylated)
Essential B vitamins in their active methylated forms, supporting energy production, mood, and cognitive function.
What the evidence says
B-Complex helped in about half (5/8) of the studies that measured an effect — promising, but not unanimous.
Most evidence is from high-quality meta-analyses and randomised trials published 2006–2025 with a typical study size of 1,925 participants.
Based on 39 studies · 22 meta-analyses · 11 RCTs · 417,797 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include B-Complex.
B-Complex has an evidence score of 9/10 — very strong evidence based on 39 indexed studies, including 20 meta-analyses. Essential B vitamins in their active methylated forms, supporting energy production, mood, and cognitive function.
The commonly studied dose of B-Complex is 1 capsule daily (per label). Research points to an estimated optimal dose around 1.5capsule, with a minimum effective dose near 1capsule. Individual response varies — start low and adjust.
The best time to take B-Complex is in the morning. Take it with food. B vitamins are coenzymes in energy metabolism and neurotransmitter synthesis.
Choline
Mixed evidencePrecursor to acetylcholine and phosphatidylcholine — critical for memory, liver function, and cell membrane integrity.
Myo-Inositol
Probably helpsFirst-line natural treatment for PCOS that improves insulin sensitivity and ovulation — also reduces anxiety, panic, and OCD symptoms.
Last reviewed May 2026 · evidence from 40 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
B vitamins are essential cofactors for energy metabolism, neurotransmitter synthesis, and methylation. Methylated forms (methylcobalamin, methylfolate) are particularly important for those with MTHFR gene variants. Deficiency is common and affects energy, mood, and cognition.
Essential cofactors for ATP production
Required for making serotonin, dopamine, GABA
Supports critical cellular methylation reactions
How B-Complex works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
1 capsule daily (per label)
Take with food
| Form | Type |
|---|---|
| 💊Methylated B-complex (methylcobalamin, methylfolate) | Recommended |
| 💊Regular B-complex | Alternative |
| 💊Individual B vitamins | Alternative |
Methylated forms are crucial for those with MTHFR variants (40-60% of population). Look for methylcobalamin (B12), methylfolate (B9), and P-5-P (B6).
Minimum: 4 weeks
Optimal: 8 weeks
Cycling: Not required
Note: Take in morning as B vitamins can be energizing and may affect sleep if taken late. Always take with food to reduce nausea.
Multiple meta-analyses show small but statistically significant benefits for cognitive function in older adults and stroke prevention populations. Effect sizes are modest (SMD ~0.15-0.18). Benefits may be more pronounced in B-vitamin deficient populations.
Reduced fatigue and better energy
Improved mood and mental wellbeing
B2 (riboflavin) colors urine bright yellow
Folate essential for pregnancy; use prenatal vitamins
B12 absorption decreases with age; methylcobalamin preferred
B12 supplementation essential
B6 can reduce levodopa effectiveness
Folate may interfere; consult doctor
Folate may affect levels
Tip: Take with food
Tip: Normal; excess B2 being excreted
Tip: Use niacinamide instead of niacin
Both support energy metabolism
Enhanced energy production and nervous system support
Both support brain health and mood
Comprehensive brain and mood support
B6 is a cofactor for serotonin synthesis
Supports efficient conversion to serotonin
ALA may deplete B vitamins; B1 is especially important
Prevents potential B vitamin depletion
All needed for red blood cell production
Complete anemia prevention/treatment
B vitamins work together in methylation
Optimal methylation cycle support with all B vitamins
B vitamins support SAMe recycling
Optimized methylation cycle
B vitamins are cofactors in catecholamine synthesis
Supports the conversion of tyrosine to neurotransmitters
B6 supports hormone metabolism
Enhanced hormonal balance
For individuals with high stress, neurological concerns, or energy deficits, a high-dose B-complex on top of a standard MVI can provide therapeutic levels of B vitamins that standard MVIs cannot achieve.
Therapeutic B-vitamin levels for enhanced energy metabolism, homocysteine lowering, and cognitive support
B-Complex is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are nausea, bright yellow urine, flushing (high-dose niacin). Use caution if any of these apply to you: Leber's disease (avoid high-dose B12); Allergy to any B vitamin.
Vitamin B12
Likely helpsDrives nerve myelination, red blood cell formation, and DNA synthesis — deficiency is common in vegans, vegetarians, and older adults.
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