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B-Complex 100

Bluebonnet
4.7
★ ★ ★ ★ ★
(676 ratings)
Thiamin 100 mg
PABA 50 mg
Niacin 100 mg
Riboflavin 100 mg
Vitamin B6 100 mg
Vitamin B5 100 mg
Choline 41 mg
Product Image
Score67
Complete and economical B-vitamin coverage is offset by conventional forms and a 100 mg vitamin B6 dose that is too aggressive for routine long-term use.
How scoring works
Quantity:50 Capsule(s) • (50 servings)
Goals:
Energy
Metabolism Boost

Score 67

Complete and economical B-vitamin coverage is offset by conventional forms and a 100 mg vitamin B6 dose that is too aggressive for routine long-term use.
How scoring works
$11.30($0.22 per serving)
iHerb
$ 15.60
Daily Vita
$ 15.60
Daily Vita
$ 11.30
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Analysis

Thiamine, riboflavin, niacinamide, vitamin B6, folate, vitamin B12, biotin, and pantothenic acid create broad support for normal energy metabolism. Most core B vitamins are supplied at 100 mg or a similarly high multiple of daily needs, so the formula is better described as high potency than balanced maintenance nutrition.

Pyridoxine hydrochloride and cyanocobalamin are conventional forms that require conversion before use. Choline at 41 mg is only a small addition, and PABA and inositol provide limited practical depth beside the main B vitamins.

Folate at 667 mcg DFE is clearly stated and provides substantial coverage. Duplicate vitamin B12 and biotin entries make the supplied label totals uncertain.

Who is it for
  • Adults seeking a high-potency B-complex for limited or clinician-directed use
  • People who value a simple once-daily serving
  • Users who have checked total vitamin B6 and folic acid intake from other products
Best for
  • Broad B-vitamin coverage
  • Supporting normal energy metabolism when intake is inadequate
  • Users prioritizing low serving cost over premium coenzyme forms

Pros

  • Includes all core B vitamins with stated amounts
  • Uses non-flushing niacinamide
  • Provides substantial thiamine, riboflavin, and pantothenic acid
  • Simple daily serving is easy to follow

Cons

  • 100 mg pyridoxine is unnecessarily high for a daily maintenance formula
  • Uses conventional cyanocobalamin and pyridoxine hydrochloride
  • Choline is modest at 41 mg
  • PABA and inositol add little to the core energy rationale
  • Duplicate label entries obscure the true B12 and biotin totals

Warnings

  • Prolonged use of 100 mg vitamin B6 may cause tingling, numbness, or other nerve symptoms; stop use and seek advice if these occur.
  • Niacinamide at this amount may cause nausea or stomach discomfort in sensitive users.
  • PABA can interfere with sulfonamide antibiotics, so concurrent use should be reviewed with the prescriber.

Nutrient quality

61 Moderate impact

The formula supplies high amounts across the B-vitamin family. Very high B6 and niacinamide with basic forms make routine daily use unnecessarily aggressive.

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Ingredient transparency

69 High impact

Most active amounts are stated without a hidden blend. Duplicate entries, generic folate, missing directions, and absent excipients reduce clarity.

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Customer satisfaction

69 High impact

The aggregate satisfaction signal is strong and supported by substantial volume. Missing review details prevent assessment of recurring complaints or purpose fit.

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Value for money

72 High impact

Potent dosing offers moderate serving value. Aggressive B6, basic forms, and duplicate entries make gentler products more competitive.

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Goals

Energy
Impact
Highest effect
A- Goal FitB+ Strength of SupportC+ CoverageA Formula Quality
Vitamin B5 · 100 mgRiboflavin · 100 mgThiamin · 100 mgVitamin B12 · 100 mcg

A full high-potency B-complex directly supports carbohydrate metabolism and cellular energy enzymes. The focused formula is most relevant when intake is inadequate and does not act as an immediate stimulant.

Amounts are clear, although several vitamins use standard forms that require conversion in the body. The high vitamin B6 amount warrants care with prolonged daily use because tingling, numbness, or other nerve symptoms can occur.

Metabolism Boost
Impact
Moderate effect
C- Goal FitB- Strength of SupportC- CoverageB- Formula Quality
Biotin · 100 mcgNiacin · 100 mgVitamin B12 · 100 mcgRiboflavin · 100 mgThiamin · 100 mgVitamin B5 · 100 mgVitamin B6 · 100 mg

High-dose B vitamins support the coenzyme reactions used to process carbohydrate, fat, and protein. The formula lacks chromium, magnesium, carnitine, CoQ10, or a thermogenic ingredient.

Transparent doses give it strong foundational depth, but the vitamin B6 amount is unusually high. Long-term daily use at that B6 level may increase the risk of nerve symptoms.

Study evidence
Vitamin B6 Supportive 16 studies

Ingredients

IngredientAmount per serving
Thiamine (Thiamine Mononitrate)
100 mg
Riboflavin (Vitamin B2)
100 mg
Niacin (Niacinamide)
100 mg
Vitamin B6 (Pyridoxine Hydrochloride)
100 mg
Folate
667 mcg DFE
Vitamin B12 (Cyanocobalamin)
100 mcg
Biotin
100 mcg
Pantothenic Acid (Calcium D-Pantothenate)
100 mg
Choline (Choline Bitartrate)
41 mg
Inositol
100 mg
PABA
50 mg
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Sugar Free No Allergies Vegetarian
Report overview
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

Thiamine mononitrate provides a standard water-soluble form at a solid high-potency amount. The exact dose is clearly disclosed, and the capsule avoids a proprietary thiamin blend. Strong active delivery at a below-median serving cost makes this B-complex economical.

PABA · 50 mg OverallScore84
A Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyB- Value

Clearly identified PABA delivers a standard high-potency B-complex dose. Immediate release is appropriate at this amount, while missing excipient details leave additive cleanliness uncertain. The one-capsule serving is convenient, and the normalized PABA cost offers moderate value.

B+ Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyC Value

Niacinamide reaches a useful general-support amount without the usual nicotinic-acid flush. The capsule uses standard immediate release, and the label clearly identifies the form. A complete high-potency B-complex at a moderate serving cost offers good value.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Influence of thiamin supplementation on the health and general well-being of an elderly Irish population with marginal thiamin deficiency.
    Smidt LJ; Cremin FM; Grivetti LE; Clifford AJ · Journal of gerontology · 1991
    Randomized trial80 participantsEnergy forThiamin
  2. High-dose oral thiamine versus placebo for chronic fatigue in patients with primary biliary cholangitis: A crossover randomized clinical trial.
    Bager P; Bossen L; Gantzel R; Grønbæk H · PloS one · 2024
    Randomized trial36 participantsEnergy forThiamin
  3. Physicochemical properties of and volatile compounds in riboflavin fortified cloudy apple juice; study of its effect on job fatigue among Egyptian construction workers.
    Fouad S; Ibrahim GE; Hussein AMS; Ibrahim FA; El Gendy A · Heliyon · 2021
    Non-randomized trialEnergy forRiboflavin
  4. Vitamin B status in patients with chronic fatigue syndrome.
    Heap LC; Peters TJ; Wessely S · Journal of the Royal Society of Medicine · 1999
    Case-control study30 participantsEnergy forRiboflavin
  5. The differential impact of three different NAD+ boosters on circulatory NAD and microbial metabolism in humans.
    Christen S; Redeuil K; Goulet L; Giner MP; Breton I; Rota R; Frézal A; Nazari A; Van den Abbeele P; Godin JP; Nutten S; Cuenoud B · Nature metabolism · 2026
    Randomized trial65 participantsMetabolism Boost forNiacin
  6. Lipid-lowering therapies, glucose control and incident diabetes: evidence, mechanisms and clinical implications.
    Zafrir B; Jain M · Cardiovascular drugs and therapy · 2015
    Narrative reviewMetabolism Boost forNiacin
  7. Insights Into Thiamine Supplementation in Patients With Septic Shock.
    Costa NA; Pereira AG; Sugizaki CSA; Vieira NM; Garcia LR; de Paiva SAR; Zornoff LAM; Azevedo PS; Polegato BF; Minicucci MF · Frontiers in medicine · 2022
    Narrative reviewMetabolism Boost forThiamin
  8. Effect of intravenous thiamine administration on critically ill patients: A systematic review and meta-analysis of randomized controlled trials.
    Nakanishi N; Abe Y; Matsuo M; Tampo A; Yamada K; Hatakeyama J; Yoshida M; Yamamoto R; Higashibeppu N; Nakamura K; Kotani J · Clinical nutrition (Edinburgh, Scotland) · 2024
    Meta-analysis3,494 participants35 studies pooledMetabolism Boost forThiamin
  9. Influence of oral contraceptives, pyridoxine (vitamin B6), and tryptophan on carbohydrate metabolism.
    Adams PW; Wynn V; Folkard J; Seed M · Lancet (London, England) · 1976
    Clinical trial46 participantsMetabolism Boost forVitamin B6
  10. Pyridoxine challenge reflects pediatric hypophosphatasia severity and thereby examines tissue-nonspecific alkaline phosphatase's role in vitamin B6 metabolism.
    Whyte MP; Zhang F; Mack KE; Wenkert D; Gottesman GS; Ericson KL; Cole JT; Coburn SP · Bone · 2024
    Non-randomized trial149 participantsMetabolism Boost forVitamin B6
  11. Anaemia during pregnancy: could riboflavin deficiency be implicated?
    Duffy B; McNulty H; Ward M; Pentieva K · The Proceedings of the Nutrition Society · 2026
    Narrative reviewMetabolism Boost forRiboflavin
  12. Riboflavin and riboflavin-derived cofactors in adolescent girls with anorexia nervosa.
    Capo-chichi CD; Guéant JL; Lefebvre E; Bennani N; Lorentz E; Vidailhet C; Vidailhet M · The American journal of clinical nutrition · 1999
    Clinical trial34 participantsMetabolism Boost forRiboflavin
  13. Apolipoprotein E and sex modulate fatty acid metabolism in a prospective observational study of cognitive decline.
    González-Domínguez R; Castellano-Escuder P; Lefèvre-Arbogast S; Low DY; Du Preez A; Ruigrok SR; Lee H; Helmer C; Pallàs M; Urpi-Sarda M; Sánchez-Pla A; Korosi A; Lucassen PJ; Aigner L; Manach C; Thuret S; Samieri C; Andres-Lacueva C · Alzheimer's research & therapy · 2022
    Observational studyMetabolism Boost forVitamin B5
  14. Physiological and performance responses to supplementation with thiamin and pantothenic acid derivatives.
    Webster MJ · European journal of applied physiology and occupational physiology · 1998
    Randomized trial6 participantsMetabolism Boost forVitamin B5
  15. Plasma vitamin B6 vitamers before and after oral vitamin B6 treatment: a randomized placebo-controlled study.
    Bor MV; Refsum H; Bisp MR; Bleie Ø; Schneede J; Nordrehaug JE; Ueland PM; Nygard OK; Nexø E · Clinical chemistry · 2003
    Randomized trial90 participantsMetabolism Boost forVitamin B6
  16. Dietary one-carbon metabolism nutrients and risk of MASLD progression: a prospective cohort study.
    Shen L; Wang K; Li R; Li Y; Guo Y; Li F; Yuan J; Yang Z; Xia B; Lin X · European journal of clinical nutrition · 2026
    Cohort study46,800 participantsMetabolism Boost forVitamin B6
  17. Associations of Vitamin B6 Intake and Plasma Pyridoxal 5'-Phosphate with Plasma Polyunsaturated Fatty Acids in US Older Adults: Findings from NHANES 2003-2004.
    Kim H; Enrione EB; Narayanan V; Li T; Campa A · Nutrients · 2022
    Cross-sectional study461 participantsMetabolism Boost forVitamin B6
  18. Effect of oral contraceptives and vitamin B6 deficiency on carbohydrate metabolism.
    Rose DP; Leklem JE; Brown RR; Linkswiler HM · The American journal of clinical nutrition · 1975
    Clinical trialMetabolism Boost forVitamin B6