B Complex (Methylated)
A complete B vitamin formula using active, methylated forms your body can actually use. Supports energy, mood, methylation, and nervous system health.
Most B complex supplements use cheap, synthetic forms your body has to convert before using. Methylated B complex skips that step — giving you the active forms directly: P5P (B6), methylcobalamin (B12), and 5-MTHF (folate). This matters especially if you have MTHFR gene variants, which about 30–40% of Indians carry.
Good for you if: You feel fatigued despite good sleep, have high homocysteine, carry MTHFR variants, or want foundational methylation support.
Dive deeper into the researchCommon side effects
- Nausea if taken without food
- Bright yellow urine (harmless — excess riboflavin)
- Tingling at very high B6 doses (above 100 mg/day)
What does a B complex do?
B vitamins are coenzymes — they help your body's enzymes do their jobs. Without them, you can't efficiently convert food into energy, make neurotransmitters, repair DNA, or clear homocysteine (an inflammatory amino acid linked to heart disease).
The "methylated" part matters because several key B vitamins need to be in their active form to work. About 30–40% of people have genetic variants (MTHFR, COMT) that make it harder to convert synthetic B vitamins into their active forms. Methylated B complex bypasses this bottleneck.
What can you expect?
- More steady energy — B vitamins are essential for mitochondrial energy production
- Better mood — B6, B12, and folate are needed to make serotonin and dopamine
- Lower homocysteine — B6, B12, and folate work together to clear this inflammatory marker
- Improved focus — supports myelin production and nerve signalling
- Better sleep quality — B6 supports melatonin synthesis
How to take it
1 capsule in the morning with food. B vitamins can be mildly energising, so morning dosing works best.
Look for a formula with: Methylcobalamin (B12), 5-MTHF (folate), P5P (B6), riboflavin-5-phosphate (B2), and benfotiamine (B1).
Don't worry about yellow urine: Excess riboflavin (B2) turns your urine bright yellow. This is completely harmless and just means your body is excreting what it doesn't need.
Which forms to look for
| Vitamin | Active form | Avoid |
|---|---|---|
| B6 | Pyridoxal-5-Phosphate (P5P) | Pyridoxine HCl |
| B9 (Folate) | 5-MTHF (Methylfolate) | Folic acid |
| B12 | Methylcobalamin | Cyanocobalamin |
| B1 | Benfotiamine | Thiamine HCl |
| B2 | Riboflavin-5-Phosphate | Riboflavin |
Track your homocysteine and B12 alongside your B complex
eterni connects your labs and supplements — so you can see if methylation support is actually working.
Get early accessFrequently Asked Questions
Why methylated B vitamins instead of regular?
About 30–40% of people carry MTHFR gene variants that reduce their ability to convert synthetic B vitamins (like folic acid and cyanocobalamin) into active forms. Methylated forms bypass this conversion step entirely, ensuring everyone can use them effectively. Even without MTHFR variants, active forms are more bioavailable.
Can B vitamins cause anxiety?
Rarely. Some people who are sensitive to methyl donors may feel overstimulated with high-dose methylcobalamin or methylfolate. If this happens, try hydroxocobalamin (B12) and folinic acid (folate) instead — these are active but non-methylated. Start with lower doses and build up.
How do I know if I need a B complex?
Check your homocysteine level — if it is above 8 μmol/L, you likely need better B vitamin support. Also check serum B12 (aim above 500 pg/mL) and folate. Symptoms of deficiency include fatigue, brain fog, tingling in hands/feet, mouth ulcers, and low mood.
Is it safe to take B complex every day?
Yes. B vitamins are water-soluble — your body excretes what it does not need. The exception is B6: chronic intake above 100 mg/day of pyridoxine (not P5P) can cause peripheral neuropathy. P5P form is safer at moderate doses. Standard B complex formulas are well within safe limits.
How it works in your body
B vitamins serve as coenzymes in hundreds of metabolic reactions. The methylation cycle — where B12, folate, and B6 work together — is central to DNA repair, neurotransmitter synthesis, and homocysteine clearance. Methylation also regulates gene expression through epigenetic mechanisms, making it relevant to ageing and longevity.
The MTHFR enzyme converts folic acid to 5-MTHF (the active form). Common variants like C677T reduce this enzyme's efficiency by 30–70%. By taking 5-MTHF directly, you bypass this bottleneck entirely.
What the studies show
- Homocysteine: B6 + B12 + folate supplementation reduces homocysteine by 25–30% on average
- Cognitive function: B vitamin supplementation slowed brain atrophy by 30% in older adults with elevated homocysteine (VITACOG trial)
- Mood: Meta-analyses show B complex supplementation improves stress, anxiety, and mood scores vs placebo
- Energy: B vitamin deficiency is a common cause of unexplained fatigue — correction typically improves energy within 2–4 weeks
Side effects & safety
B complex vitamins are among the safest supplements available:
- Yellow urine — From riboflavin (B2). Completely harmless.
- Nausea — If taken on an empty stomach. Take with food.
- Overstimulation — Some people sensitive to methyl groups may feel anxious or wired. Switch to non-methylated active forms.
- B6 neuropathy — Only with chronic high-dose pyridoxine (100+ mg/day). P5P form is much safer.
Who should be cautious: People on levodopa (Parkinson's medication) should consult their doctor, as B6 can reduce its effectiveness. Otherwise, B complex is safe for virtually everyone.
Which labs to check
- Homocysteine — the primary marker B vitamins help optimise (target: below 8 μmol/L)
- Vitamin B12 (serum) — aim for 500+ pg/mL, not just "within range"
- Folate (serum or RBC) — RBC folate is more accurate for tissue status
- MMA (methylmalonic acid) — the most sensitive B12 deficiency marker
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eterni connects your lab results, supplements, and retests — so you can see the trajectory, not just a snapshot.
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