B-Complex Vitamins
Also sold as: B vitamins · Vitamin B complex · B-group vitamins
A mixture of B-vitamin cofactors marketed for fatigue, mood and nerves. Benefits depend on vitamin, baseline status and formulation; water solubility does not prevent toxicity.
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Research
- Focus: Small or inconsistent cognition findings depend on baseline status; dementia prevention is unproven.
- Anxiety: A meta-analysis found a small stress effect but no significant anxiety benefit.
- Energy: No reliable universal energy boost in well-nourished adults; one small fatigue trial does not establish a class effect.
REALITY CHECK // Correcting deficiency differs from boosting a well-nourished person. Stress effects are small, anxiety and depression effects were not significant in a meta-analysis, and lowering homocysteine does not automatically prevent heart attacks. Chronic high B6 can cause neuropathy.
Levels: how we grade evidence. Grey = evidence of no benefit; amber = evidence it makes this goal worse.
Ratings are self-reported by a self-selected group of users: how it felt, not proof that it works.
Check your bottle
Compare what your label says with what was used in trials. This is a trial range, not a personal prescription.
Enter the amount from your label to see the result.
How it was studied
01 // STUDIED_DOSE_RANGE
Human trial amounts
No single studied dose exists for an entire B-complex. A small crossover fatigue trial ran 28 days; mood trials generally lasted at least 4 weeks. Migraine studies used approximately 400 mg/day riboflavin alone, which cannot be inferred from a routine B-complex.
02 // TIMING_&_MATRIX
Ingredients and tolerability
No uniform timing or food rule covers every B-complex. Activation/insomnia reports do not establish a universal pharmacologic effect.
03 // EVALUATION_WINDOW
At least 4 weeks in mood trials
Individual migraine, deficiency and neuropathy studies have different schedules; one product cannot inherit every result.
04 // SAFETY_&_QUALITY_GATE
Check context and label
No combined B-complex UL exists. The dossier B6 EFSA figures conflict (25 mg historical versus approximately 12 mg in a flagged 2023 update); fixed calculator ULs remain null pending primary verification. It quotes US B6 100 mg/day, supplemental niacin 35 mg/day and folic acid 1 mg/day; these distinct ingredient limits must not be applied to total tablet mass. No UL is not proof that megadoses are safe. Avoid unsupervised megadoses during pregnancy/lactation; pregnancy folate prevention remains a separate clinical/public-health indication. Review kidney disease, liver disease, Leber hereditary optic neuropathy, levodopa without carbidopa and antiepileptics. New tingling, numbness or gait changes require stopping the product and clinical assessment. High-dose B6/B12 and lung cancer signals in male smokers are observational, not proof of causation.
UPPER LIMIT // No combined B-complex UL exists. The dossier B6 EFSA figures conflict (25 mg historical versus approximately 12 mg in a flagged 2023 update); fixed calculator ULs remain null pending primary verification. It quotes US B6 100 mg/day, supplemental niacin 35 mg/day and folic acid 1 mg/day; these distinct ingredient limits must not be applied to total tablet mass. No UL is not proof that megadoses are safe.
Summary
Correcting deficiency differs from boosting a well-nourished person. Stress effects are small, anxiety and depression effects were not significant in a meta-analysis, and lowering homocysteine does not automatically prevent heart attacks. Chronic high B6 can cause neuropathy.
Mechanism
B vitamins serve as cofactors in energy metabolism and one-carbon pathways; they supply no calories. Folate/B12/B6 affect homocysteine, but a biomarker response does not prove clinical protection.
Typical studied dose
No single studied dose exists for an entire B-complex. A small crossover fatigue trial ran 28 days; mood trials generally lasted at least 4 weeks. Migraine studies used approximately 400 mg/day riboflavin alone, which cannot be inferred from a routine B-complex.
Upper limit
No combined B-complex UL exists. The dossier B6 EFSA figures conflict (25 mg historical versus approximately 12 mg in a flagged 2023 update); fixed calculator ULs remain null pending primary verification. It quotes US B6 100 mg/day, supplemental niacin 35 mg/day and folic acid 1 mg/day; these distinct ingredient limits must not be applied to total tablet mass. No UL is not proof that megadoses are safe.
Popular stacks with B-Complex Vitamins
Not enough stack data yet. A combination with B-Complex Vitamins appears here once 5 people rate the same set.
Forms and label traps
| Form on label | Active content | Studied range / day | Absorption & GI tolerance | Verdict |
|---|---|---|---|---|
| Vitamin B12: cyanocobalamin, declared B12 mg Best for: Label comparison against the preparation actually studied. |
Unstandardized: active content unknown | no comparable trial range | Stable standard form; clinical context and absorption matter. Usually well tolerated. |
Caution [CAUTION // CHECK_FORM] B12 is one ingredient, not a proxy for total B-complex potency. Enter its own declared amount; no universal B-complex trial range exists. 1000 micrograms = 1 mg. |
| Vitamin B12: methyl-, hydroxo- or adenosylcobalamin Best for: Label comparison against the preparation actually studied. |
Unstandardized: active content unknown | no comparable trial range | No universal superiority in healthy adults is established. Tolerance depends on the amount and individual sensitivity. |
Caution [CAUTION // CHECK_FORM] Do not compare total blend mass or infer clinical superiority from active-form marketing. No common trial range is entered. |
| Vitamin B6: pyridoxine or P5P, declared B6 mg Best for: Label comparison against the preparation actually studied. |
Unstandardized: active content unknown | no comparable trial range | Most people convert pyridoxine; form does not remove dose-related risk. Tolerance depends on the amount and individual sensitivity. |
Caution [CAUTION // CHECK_FORM] No universal effective B-complex range. The individual B6 amount is safety-relevant; P5P is not proven protection against neuropathy. |
| Folate: folic acid, methylfolate or folinic acid Best for: Label comparison against the preparation actually studied. |
Unstandardized: active content unknown | no comparable trial range | Folic acid has substantial prevention-trial evidence; broad methylfolate superiority is not established. Tolerance depends on the amount and individual sensitivity. |
Caution [CAUTION // CHECK_FORM] Use the actual folate ingredient declaration and its units. These forms and dietary-folate-equivalent labels are not interchangeable by total tablet mass. |
Common label traps
- TRAP_01 // Water soluble means megadoses are harmless
B6 can cause sensory neuropathy and high-dose niacin can cause liver injury; urinary excretion is no safety guarantee. - TRAP_02 // Methylated forms are always better
General clinical superiority is not established. P5P does not remove B6 toxicity concerns; individual indications differ. - TRAP_03 // Lower homocysteine guarantees fewer heart attacks
Homocysteine is a surrogate. Cardiovascular outcome findings must be assessed separately. - TRAP_04 // More B vitamins means more energy
Cofactor roles do not establish stimulation or extra energy in people with adequate intake.
Other outcomes studied
Outside the five leaderboard goals. Same evidence levels as above.
- HOMOCYSTEINE Strong · benefit
A 19-trial analysis involving 47,921 participants reported consistent lowering; it is a biomarker rather than proof of cardiovascular-event protection.
PMID 22652362 - STRESS VS ANXIETY Limited · benefit
Across 16 RCTs (2015 participants), stress SMD 0.23 (95% CI 0.02-0.45) was small; depression 0.15 (CI -0.01 to 0.32) and anxiety 0.03 (CI -0.13 to 0.20) were not significant.
PMID 31527485 PMID 23362497 PMID 28178022 PMID 32063563 - FATIGUE Limited · benefit
One 28-day crossover trial in 32 healthy adults aged 20-30 reported a signal for a specific B1/B2/B6/B12 product. It cannot establish all-complex efficacy.
PMID 31963141 PMID 37786445 - COGNITION Limited · benefit
Pooled cognition findings were small/inconsistent and varied by nutritional status and homocysteine. Mixed observational/RCT evidence does not establish prevention of dementia.
PMID 34432056 PMID 32414424 PMID 40966571 PMID 23084026 PMID 14584018 - MIGRAINE Moderate · benefit
Riboflavin-alone studies, commonly 400 mg/day, reported fewer migraine days/frequency with heterogeneous evidence. This is not evidence for ordinary B-complex doses.
PMID 33779525 PMID 28485121 PMID 26780280 - NEUROPATHY Limited · benefit
Selected B12/benfotiamine studies suggest benefit, particularly with deficiency or diabetes. B6 excess itself causes neuropathy, so more is not uniformly better.
PMID 33619867 PMID 32716261 PMID 32722436 PMID 37447150 PMID 33912895 - CARDIOVASCULAR EVENTS Moderate · no benefit
Despite lower homocysteine, pooled RCT results were not significant for cardiovascular disease (RR 0.98, 95% CI 0.94-1.03), coronary disease (0.98, CI 0.92-1.05), MI (0.97, CI 0.90-1.05), cardiovascular death (0.97, CI 0.91-1.02) or all-cause mortality (0.99, CI 0.95-1.04).
PMID 22652362 PMID 25590290 PMID 28816346 PMID 37850302 - STROKE Limited · benefit
Stroke differs from other cardiovascular outcomes: pooled RR 0.88 (95% CI 0.82-0.95). An individual-data analysis reported RR 0.78 (CI 0.67-0.90) with normal renal function versus 1.04 (CI 0.84-1.27) with impaired kidneys plus high-dose cyanocobalamin; interaction p=0.03. Baseline folate status and fortification affect applicability.
PMID 22652362 PMID 28816120 PMID 38824900 PMID 24049135 PMID 32503038
Reader questions
Will B-complex give me energy?
Correction of inadequate status can help deficiency-related symptoms. A small commercial-product fatigue trial does not prove a general energy boost in well-nourished adults.
Can B6 cause numbness?
Yes, chronic excessive B6 can cause sensory neuropathy. New numbness or balance changes need prompt assessment; switching to P5P is not an established safeguard.
Must I choose methylated forms because of MTHFR?
Genotype and a marketing active-form claim do not establish universal benefit. Folate indication, B12 status and tolerance matter; ask a clinician about a specific problem.
Does high-dose B6 or B12 cause lung cancer?
The supplied concern is observational, especially in male smokers. It does not establish causation, but it is another reason not to assume long-term megadoses are harmless.
Stack interactions
- Danger Levodopa without carbidopa [DANGER // CLINICAL_REVIEW]
Pyridoxine can increase peripheral levodopa metabolism and reduce its effect. The dossier automatic antidepressant label is incorrect; this is Parkinson treatment. - Caution Metformin [CAUTION // REVIEW_COMBINATION]
Long-term treatment can reduce B12 status, especially relevant to anemia or neuropathy.
PMID 27130885 PMID 30615306 - Caution Proton-pump inhibitors and H2 blockers [CAUTION // REVIEW_COMBINATION]
Reduced food-bound B12 absorption is a status issue, not equivalent to failure of every oral supplement.
PMID 27130885 - Danger Methotrexate and antiepileptic medicines [DANGER // CLINICAL_REVIEW]
Folate timing and dosing must be coordinated with the prescriber; potential effects differ between rheumatology, oncology and seizure treatment. - Danger High folate with unrecognized B12 deficiency [DANGER // CLINICAL_REVIEW]
Folate can correct the anemia while B12-related neurological injury continues. Check the underlying cause rather than treating a blood count alone.
Red flags: interactions and who should avoid it
Interactions
Levodopa without carbidopa: Pyridoxine can increase peripheral levodopa metabolism and reduce its effect. The dossier automatic antidepressant label is incorrect; this is Parkinson treatment. Metformin: Long-term treatment can reduce B12 status, especially relevant to anemia or neuropathy. Proton-pump inhibitors and H2 blockers: Reduced food-bound B12 absorption is a status issue, not equivalent to failure of every oral supplement. Methotrexate and antiepileptic medicines: Folate timing and dosing must be coordinated with the prescriber; potential effects differ between rheumatology, oncology and seizure treatment. High folate with unrecognized B12 deficiency: Folate can correct the anemia while B12-related neurological injury continues. Check the underlying cause rather than treating a blood count alone.
Avoid or ask a doctor first if
Avoid unsupervised megadoses during pregnancy/lactation; pregnancy folate prevention remains a separate clinical/public-health indication. Review kidney disease, liver disease, Leber hereditary optic neuropathy, levodopa without carbidopa and antiepileptics. New tingling, numbness or gait changes require stopping the product and clinical assessment. High-dose B6/B12 and lung cancer signals in male smokers are observational, not proof of causation.
Sources (PubMed, 33)
- Folic acid with or without vitamin B12 for cognition and dementia.
PMID 14584018 · 2003 · Journal Article; Systematic ReviewPooled cognition findings were small/inconsistent and varied by nutritional status and homocysteine. Mixed observational/RCT evidence does not establish prevention of dementia.
- Pharmacokinetic study on the utilisation of 5-methyltetrahydrofolate and folic acid in patients with coronary artery disease.
PMID 14769778 · 2004 · Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov'tDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- Meta-analysis of B vitamin supplementation on plasma homocysteine, cardiovascular and all-cause mortality.
PMID 22652362 · 2012 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; ReviewA 19-trial analysis involving 47,921 participants reported consistent lowering; it is a biomarker rather than proof of cardiovascular-event protection.
- Vitamin B₁₂ status, cognitive decline and dementia: a systematic review of prospective cohort studies.
PMID 23084026 · 2012 · Journal Article; Systematic ReviewPooled cognition findings were small/inconsistent and varied by nutritional status and homocysteine. Mixed observational/RCT evidence does not establish prevention of dementia.
- Effects of vitamin and mineral supplementation on stress, mild psychiatric symptoms, and mood in nonclinical samples: a meta-analysis.
PMID 23362497 · 2013 · Journal Article; Meta-AnalysisAcross 16 RCTs (2015 participants), stress SMD 0.23 (95% CI 0.02-0.45) was small; depression 0.15 (CI -0.01 to 0.32) and anxiety 0.03 (CI -0.13 to 0.20) were not significant.
- Folate, folic acid and 5-methyltetrahydrofolate are not the same thing.
PMID 24494987 · 2014 · Journal Article; Research Support; Non-U.S. Gov't; ReviewDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- Supplementation with Riboflavin (Vitamin B2) for Migraine Prophylaxis in Adults and Children: A Review.
PMID 26780280 · 2015 · Journal Article; ReviewRiboflavin-alone studies, commonly 400 mg/day, reported fewer migraine days/frequency with heterogeneous evidence. This is not evidence for ordinary B-complex doses.
- Association between metformin and vitamin B12 deficiency in patients with type 2 diabetes: A systematic review and meta-analysis.
PMID 27130885 · 2016 · Journal Article; Meta-Analysis; Systematic ReviewDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- The impact of essential fatty acid, B vitamins, vitamin C, magnesium and zinc supplementation on stress levels in women: a systematic review.
PMID 28178022 · 2017 · Journal Article; Systematic ReviewAcross 16 RCTs (2015 participants), stress SMD 0.23 (95% CI 0.02-0.45) was small; depression 0.15 (CI -0.01 to 0.32) and anxiety 0.03 (CI -0.13 to 0.20) were not significant.
- Prophylaxis of migraine headaches with riboflavin: A systematic review.
PMID 28485121 · 2017 · Journal Article; Systematic ReviewRiboflavin-alone studies, commonly 400 mg/day, reported fewer migraine days/frequency with heterogeneous evidence. This is not evidence for ordinary B-complex doses.
- B vitamins in stroke prevention: time to reconsider.
PMID 28816120 · 2017 · Journal Article; Meta-Analysis; ReviewDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- Associations between metformin use and vitamin B12 levels, anemia, and neuropathy in patients with diabetes: a meta-analysis.
PMID 30615306 · 2019 · Journal Article; Meta-AnalysisDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- A Systematic Review and Meta-Analysis of B Vitamin Supplementation on Depressive Symptoms, Anxiety, and Stress: Effects on Healthy and 'At-Risk' Individuals.
PMID 31527485 · 2019 · Journal Article; Meta-Analysis; Systematic ReviewAcross 16 RCTs (2015 participants), stress SMD 0.23 (95% CI 0.02-0.45) was small; depression 0.15 (CI -0.01 to 0.32) and anxiety 0.03 (CI -0.13 to 0.20) were not significant.
- Vitamins and Minerals for Energy, Fatigue and Cognition: A Narrative Review of the Biochemical and Clinical Evidence.
PMID 31963141 · 2020 · Journal Article; ReviewOne 28-day crossover trial in 32 healthy adults aged 20-30 reported a signal for a specific B1/B2/B6/B12 product. It cannot establish all-complex efficacy.
- Adjunctive folate for major mental disorders: A systematic review.
PMID 32063563 · 2020 · Journal Article; Meta-Analysis; Systematic ReviewAcross 16 RCTs (2015 participants), stress SMD 0.23 (95% CI 0.02-0.45) was small; depression 0.15 (CI -0.01 to 0.32) and anxiety 0.03 (CI -0.13 to 0.20) were not significant.
- Vitamin B-Can it prevent cognitive decline? A systematic review and meta-analysis.
PMID 32414424 · 2020 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; Systematic ReviewPooled cognition findings were small/inconsistent and varied by nutritional status and homocysteine. Mixed observational/RCT evidence does not establish prevention of dementia.
- Efficacy and Safety of Mecobalamin on Peripheral Neuropathy: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
PMID 32716261 · 2020 · Journal Article; Meta-Analysis; Systematic ReviewSelected B12/benfotiamine studies suggest benefit, particularly with deficiency or diabetes. B6 excess itself causes neuropathy, so more is not uniformly better.
- B12 as a Treatment for Peripheral Neuropathic Pain: A Systematic Review.
PMID 32722436 · 2020 · Journal Article; Systematic ReviewSelected B12/benfotiamine studies suggest benefit, particularly with deficiency or diabetes. B6 excess itself causes neuropathy, so more is not uniformly better.
- Folic acid versus 5- methyl tetrahydrofolate supplementation in pregnancy.
PMID 32868164 · 2020 · Journal Article; ReviewDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- Association between neuropathy and B-vitamins: A systematic review and meta-analysis.
PMID 33619867 · 2021 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; Systematic ReviewSelected B12/benfotiamine studies suggest benefit, particularly with deficiency or diabetes. B6 excess itself causes neuropathy, so more is not uniformly better.
- Effect of Vitamin B2 supplementation on migraine prophylaxis: a systematic review and meta-analysis.
PMID 33779525 · 2022 · Journal Article; Meta-Analysis; Systematic ReviewRiboflavin-alone studies, commonly 400 mg/day, reported fewer migraine days/frequency with heterogeneous evidence. This is not evidence for ordinary B-complex doses.
- Vitamin B-6-Induced Neuropathy: Exploring the Mechanisms of Pyridoxine Toxicity.
PMID 33912895 · 2021 · Journal Article; ReviewSelected B12/benfotiamine studies suggest benefit, particularly with deficiency or diabetes. B6 excess itself causes neuropathy, so more is not uniformly better.
- B vitamins and prevention of cognitive decline and incident dementia: a systematic review and meta-analysis.
PMID 34432056 · 2022 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; Systematic ReviewPooled cognition findings were small/inconsistent and varied by nutritional status and homocysteine. Mixed observational/RCT evidence does not establish prevention of dementia.
- The Role of Vitamin B6 in Peripheral Neuropathy: A Systematic Review.
PMID 37447150 · 2023 · Systematic Review; Journal ArticleSelected B12/benfotiamine studies suggest benefit, particularly with deficiency or diabetes. B6 excess itself causes neuropathy, so more is not uniformly better.
- A functional evaluation of anti-fatigue and exercise performance improvement following vitamin B complex supplementation in healthy humans, a randomized double-blind trial.
PMID 37786445 · 2023 · Randomized Controlled Trial; Journal ArticleOne 28-day crossover trial in 32 healthy adults aged 20-30 reported a signal for a specific B1/B2/B6/B12 product. It cannot establish all-complex efficacy.
- Efficacy of B Vitamin Supplementation on Global Cognitive Function in Older Adults: A Systematic Review and Meta-analysis.
PMID 40966571 · 2025 · Journal Article; Systematic Review; Meta-AnalysisPooled cognition findings were small/inconsistent and varied by nutritional status and homocysteine. Mixed observational/RCT evidence does not establish prevention of dementia.
- Comparative Analysis of Treatment With Folate Forms in Clinical Practice.
PMID 41277701 · 2026 · Journal Article; Review; Comparative StudyDossier citation for preparation, pharmacokinetics or safety context; does not independently establish every efficacy or interaction claim on this card.
- Homocysteine-lowering interventions for preventing cardiovascular events.
PMID 25590290 · 2015 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; Systematic ReviewDespite lower homocysteine, pooled RCT results were not significant for cardiovascular disease (RR 0.98, 95% CI 0.94-1.03), coronary disease (0.98, CI 0.92-1.05), MI (0.97, CI 0.90-1.05), cardiovascular death (0.97, CI 0.91-1.02) or all-cause mortality (0.99, CI 0.95-1.04).
- Homocysteine-lowering interventions for preventing cardiovascular events.
PMID 28816346 · 2017 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't; Systematic ReviewDespite lower homocysteine, pooled RCT results were not significant for cardiovascular disease (RR 0.98, 95% CI 0.94-1.03), coronary disease (0.98, CI 0.92-1.05), MI (0.97, CI 0.90-1.05), cardiovascular death (0.97, CI 0.91-1.02) or all-cause mortality (0.99, CI 0.95-1.04).
- The effect of B-vitamins on the prevention and treatment of cardiovascular diseases: a systematic review and meta-analysis.
PMID 37850302 · 2024 · Journal Article; Meta-Analysis; Systematic ReviewDespite lower homocysteine, pooled RCT results were not significant for cardiovascular disease (RR 0.98, 95% CI 0.94-1.03), coronary disease (0.98, CI 0.92-1.05), MI (0.97, CI 0.90-1.05), cardiovascular death (0.97, CI 0.91-1.02) or all-cause mortality (0.99, CI 0.95-1.04).
- Folic acid supplementation for stroke prevention: A systematic review and meta-analysis of 21 randomized clinical trials worldwide.
PMID 38824900 · 2024 · Systematic Review; Journal Article; Meta-AnalysisStroke differs from other cardiovascular outcomes: pooled RR 0.88 (95% CI 0.82-0.95). An individual-data analysis reported RR 0.78 (CI 0.67-0.90) with normal renal function versus 1.04 (CI 0.84-1.27) with impaired kidneys plus high-dose cyanocobalamin; interaction p=0.03. Baseline folate status and fortification affect applicability.
- Vitamin B supplementation, homocysteine levels, and the risk of cerebrovascular disease: a meta-analysis.
PMID 24049135 · 2013 · Journal Article; Meta-AnalysisStroke differs from other cardiovascular outcomes: pooled RR 0.88 (95% CI 0.82-0.95). An individual-data analysis reported RR 0.78 (CI 0.67-0.90) with normal renal function versus 1.04 (CI 0.84-1.27) with impaired kidneys plus high-dose cyanocobalamin; interaction p=0.03. Baseline folate status and fortification affect applicability.
- Dietary Intake of Homocysteine Metabolism-Related B-Vitamins and the Risk of Stroke: A Dose-Response Meta-Analysis of Prospective Studies.
PMID 32503038 · 2020 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov'tStroke differs from other cardiovascular outcomes: pooled RR 0.88 (95% CI 0.82-0.95). An individual-data analysis reported RR 0.78 (CI 0.67-0.90) with normal renal function versus 1.04 (CI 0.84-1.27) with impaired kidneys plus high-dose cyanocobalamin; interaction p=0.03. Baseline folate status and fortification affect applicability.
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