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B-50 Complex 50 mg

Source Naturals
4.7
★ ★ ★ ★ ★
(5508 ratings)
PABA 30 mg
Vitamin B6 50 mg
Niacin 50 mg
Thiamin 50 mg
Riboflavin 50 mg
Choline 50 mg
Vitamin B5 100 mg
Product Image
Score77
Complete and economical B-vitamin coverage is offset by conventional forms and a 50 mg vitamin B6 dose that is too aggressive for routine long-term use.
How scoring works
Quantity:100 Tablet(s) • (100 servings)
Goals:
Energy
Metabolism Boost

Score 77

Complete and economical B-vitamin coverage is offset by conventional forms and a 50 mg vitamin B6 dose that is too aggressive for routine long-term use.
How scoring works
$11.75($0.11 per serving)
iHerb
$ 11.75
Vitacost
$ 12.25
iHerb
$ 11.75
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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 50 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 50 mg is only a small addition, and PABA and inositol provide limited practical depth beside the main B vitamins.

Folate exposure is also high at 1360 mcg DFE, increasing the need to account for fortified foods and other supplements. The simple serving and complete disclosure support ease of use, but the dose pattern is more aggressive than most adults need every day.

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

  • 50 mg pyridoxine is unnecessarily high for a daily maintenance formula
  • Uses conventional cyanocobalamin and pyridoxine hydrochloride
  • Choline is modest at 50 mg
  • PABA and inositol add little to the core energy rationale

Warnings

  • Prolonged use of 50 mg vitamin B6 may cause tingling, numbness, or other nerve symptoms; stop use and seek advice if these occur.
  • The 1360 mcg DFE folate amount should be counted with fortified foods and other folic acid supplements to avoid excessive long-term intake.
  • PABA can interfere with sulfonamide antibiotics, so concurrent use should be reviewed with the prescriber.

Nutrient quality

69 High impact

The complete B-vitamin pattern provides substantial energy-metabolism coverage. Basic forms and aggressive folate and B6 amounts reduce balance.

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Ingredient transparency

77 High impact

Active amounts and most forms are clear without a hidden blend. Missing directions and tablet excipients are the main label gaps.

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Customer satisfaction

71 High impact

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

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Value for money

92 Highest impact

Broad dosing and low serving cost provide strong value. Aggressive folate and B6 make more balanced formulas preferable for routine use.

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Goals

Energy
Energy
Impact
High effect
B- Goal FitC- Strength of SupportC+ CoverageA- Formula Quality
Vitamin B5 · 100 mgRiboflavin · 50 mgThiamin · 50 mgVitamin B12 · 50 mcg

The classic B-50 formula supplies substantial thiamin, riboflavin, niacin, B6, and pantothenic acid for metabolic support. It is a focused nutrient product rather than an acute energy booster.

B12 remains below the preferred goal amount and uses cyanocobalamin, while folate is standard folic acid. High B6 exposure makes long-term stacking with other B-complex products unnecessary.

Study evidence
Riboflavin Mixed 6 studies
Thiamin Disputed 12 studies
Metabolism Boost
Metabolism Boost
Impact
High effect
C Goal FitB- Strength of SupportC- CoverageA Formula Quality
Biotin · 50 mcgNiacin · 50 mgVitamin B12 · 50 mcgRiboflavin · 50 mgThiamin · 50 mgVitamin B5 · 100 mgVitamin B6 · 50 mg

High-potency B vitamins support the reactions that release energy from carbohydrate, fat, and protein. The formula remains narrow because it lacks thyroid minerals, thermogenic agents, glucose-control compounds, and dedicated mitochondrial actives.

Amounts are fully disclosed and generally substantial, with a straightforward single-tablet serving. Most forms are conventional rather than bioactive, so the product is a focused cofactor supplement rather than a comprehensive metabolism formula.

Ingredients

IngredientAmount per serving
Thiamine (Thiamine Mononitrate, Vitamin B1)
 50 mg
Riboflavin (Vitamin B2)
 50 mg
Niacin (Niacinamide)
 50 mg
Vitamin B6 (Pyridoxine Hydrochloride)
 50 mg
Folate (Folic Acid)
 1360 mcg DFE
Vitamin B12 (Cyanocobalamin)
 50 mcg
Biotin
50 mcg
Pantothenic Acid (Calcium D-Pantothenate)
 100 mg
Choline (Choline Bitartrate)
 50 mg
Inositol
50 mg
PABA
30 mg
Adults 18–50
Report overview
PABA · 30 mg OverallScore88
A Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB- Value

The 30 mg PABA amount fits a standard high-potency B-complex rather than a standalone high-dose product. PABA is clearly identified and quantified, although no pharmaceutical-grade purity claim is provided. Immediate release is appropriate at this amount, and the cost efficiency is moderate.

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Vitamin B6 (Pyridoxine Hydrochloride) · 50 mg OverallScore86
C+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The 50 mg B6 dose is well aligned with the collection, though pyridoxine hydrochloride requires conversion to the active form. Riboflavin is included to support that conversion, and one tablet makes the serving easy to use. The low serving cost gives this B-complex strong value despite the less advanced B6 form.

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Niacin (Niacinamide) · 50 mg OverallScore80
B+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyC Value

Clearly disclosed niacinamide provides an appropriate amount for a general B-complex. The standard tablet has no special release feature, but the conventional form does not require advanced precursor technology. Its low serving cost supports good practical value for broad niacin intake.

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Loading alternative details
81 Performance

Coenzyme B-Complex Caps

Country Life
<p>It improves ingredient-form quality through multiple coenzyme vitamin forms and meaningful amounts that improve form quality. Vitamin B6 remains elevated and choline is modest, so prolonged daily use still warrants caution.</p>
76 Performance

Megasorb B-Complex '50'

Solgar
<p>It improves ingredient-form quality through active riboflavin and vitamin B6 forms that improve the standard B-complex base. The dose profile remains aggressive, and long-term high vitamin B6 intake may raise the risk of nerve symptoms.</p>
74 Performance

Super B-50

NaturesPlus
<p>It improves ingredient-form quality through methylfolate and methylcobalamin alongside broad B-vitamin coverage. High pyridoxine is poorly suited to casual long-term use, while choline and biotin remain modest.</p>
77 Budget

B-50

NOW
<p>It lowers the recurring cost while providing broad, clearly listed B-vitamin coverage and a large supply. The forms are mostly conventional, and the high vitamin B6 amount is not appealing for indefinite daily use.</p>
74 Budget

B-Complex '50'

Solgar
<p>It lowers the recurring cost while providing a complete B-vitamin pattern that directly supports energy metabolism. Conventional forms, high vitamin B6, and a tiny herbal blend limit the quality upgrade.</p>
76 Budget

Hi Potency B Complex

Natural Factors
<p>No eligible candidate is priced below the original at this cost level, but this is among the nearest low-cost choices and provides a complete high-potency B-vitamin pattern with coherent energy support. High folate and vitamin B6 make the formula unnecessarily aggressive for unsupervised routine use.</p>
77 Value

B-50 Complex

Nature's Way
<p>It balances formulation quality and cost through active riboflavin and a broad, clearly dosed B-complex base. Vitamin B6 remains unnecessarily high for routine long-term use.</p>
75 Value

B-50 Complex 50 mg

Source Naturals
<p>It balances formulation quality and cost through full B-complex coverage with particularly favorable serving value. Basic forms and high vitamin B6 and folic acid amounts limit long-term suitability.</p>
75 Value

B-Complex 50

Bluebonnet
<p>It balances formulation quality and cost through a complete B-vitamin pattern with clear amounts and reasonable serving value. The formula still uses basic forms and a high vitamin B6 amount.</p>
Report alternatives

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. 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 Energy forThiamin
  3. 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
  4. Thiamine deficiency-related brain dysfunction in chronic liver failure.
    Butterworth RF · Metabolic brain disease · 2009
    Narrative reviewEnergy forThiamin
  5. 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
  6. B-vitamins, related vitamers, and metabolites in patients with quiescent inflammatory bowel disease and chronic fatigue treated with high dose oral thiamine.
    Bager P; Hvas CL; Hansen MM; Ueland P; Dahlerup JF · Molecular medicine (Cambridge, Mass.) · 2023
    Observational studyEnergy forRiboflavin
  7. 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
  8. Effects of NAD+ precursor supplementation on glucose and lipid metabolism in humans: a meta-analysis.
    Zhong O; Wang J; Tan Y; Lei X; Tang Z · Nutrition & metabolism · 2022
    Meta-analysis14,750 participants40 studies pooledMetabolism Boost forNiacin
  9. 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
  10. Changes in glucose metabolism, C-reactive protein, and liver enzymes following intake of NAD + precursor supplementation: a systematic review and meta-regression analysis.
    Sohouli MH; Tavakoli S; Reis MG; Hekmatdoost A; Guimarães NS · Nutrition & metabolism · 2024
    Meta-analysis9,256 participants45 studies pooledMetabolism Boost forNiacin
  11. Neurological, Psychiatric, and Biochemical Aspects of Thiamine Deficiency in Children and Adults.
    Dhir S; Tarasenko M; Napoli E; Giulivi C · Frontiers in psychiatry · 2026
    Narrative reviewMetabolism Boost forThiamin
  12. 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
  13. Thiamine-dependent processes and treatment strategies in neurodegeneration.
    Gibson GE; Blass JP · Antioxidants & redox signaling · 2007
    Narrative reviewMetabolism Boost forThiamin
  14. High-resolution plasma metabolomics and thiamine status in critically Ill adult patients.
    Gundogan K; Nellis MM; Ozer NT; Ergul SS; Sahin GG; Temel S; Yuksel RC; Teeny S; Alvarez JA; Sungur M; Jones DP; Ziegler TR · Metabolomics : Official journal of the Metabolomic Society · 2024
    Cross-sectional study76 participantsMetabolism Boost forThiamin
  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. 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
  17. Vitamin B6 requirements of women using oral contraceptives.
    Leklem JE; Brown RR; Rose DP; Linkswiler HM · The American journal of clinical nutrition · 1975
    Non-randomized trial24 participantsMetabolism Boost forVitamin B6
  18. Double-blind trial of pyridoxine (vitamin B6) in the treatment of steroid-dependent asthma.
    Sur S; Camara M; Buchmeier A; Morgan S; Nelson HS · Annals of allergy · 1993
    Randomized trial31 participantsMetabolism Boost forVitamin B6
  19. 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
  20. 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
  21. Disorders of flavin adenine dinucleotide metabolism: MADD and related deficiencies.
    Mereis M; Wanders RJA; Schoonen M; Dercksen M; Smuts I; van der Westhuizen FH · The international journal of biochemistry & cell biology · 2024
    Systematic reviewMetabolism Boost forRiboflavin
  22. 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
  23. 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
  24. Pantothenate synthetase is essential but not limiting for pantothenate biosynthesis in Arabidopsis.
    Jonczyk R; Ronconi S; Rychlik M; Genschel U · Plant molecular biology · 2008
    OtherMetabolism Boost forVitamin B5
  25. Exploring auxotrophy and engineering vitamin B6 prototrophy in the acetogen Clostridium sp. AWRP.
    Kwon SJ; Lee J; Lee HS · Applied and environmental microbiology · 2024
    Clinical trialMetabolism Boost forVitamin B5
  26. Metabolic features of chronic fatigue syndrome.
    Naviaux RK; Naviaux JC; Li K; Bright AT; Alaynick WA; Wang L; Baxter A; Nathan N; Anderson W; Gordon E · Proceedings of the National Academy of Sciences of the United States of America · 2024
    Case-control study84 participantsEnergy forRiboflavin
  27. Effectiveness of Riboflavin in Inherited Metabolic Diseases: A Systematic Review
    Bregje Jaeger, Nina N Stolwijk, Femke Aaldering, Charlotte A Ruys, Marije Smits, Nicole I Wolf, Carla E M Hollak, Annet M Bosch · Journal of Inherited Metabolic Disease · 2026
    Systematic review381 studies pooledEnergy forRiboflavin
  28. Randomised clinical trial: high-dose oral thiamine versus placebo for chronic fatigue in patients with quiescent inflammatory bowel disease.
    Bager P; Hvas CL; Rud CL; Dahlerup JF · Alimentary pharmacology & therapeutics · 2021
    Randomized trial40 participantsEnergy forThiamin
  29. Dietary reference values for thiamin.
    EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA); Turck D; Bresson JL; Burlingame B; Dean T; Fairweather-Tait S; Heinonen M; Hirsch-Ernst KI; Mangelsdorf I; McArdle HJ; Naska A; Nowicka G; Pentieva K; Sanz Y; Siani A; Sjödin A; Stern M; Tomé D; Van Loveren H; Vinceti M; Willatts P; Lamberg-Allardt C; Przyrembel H; Tetens I; Gudelj Rakic J; Ioannidou S; de Sesmaisons-Lecarré A; Forss AC; Neuhäuser-Berthold M · EFSA journal. European Food Safety Authority · 2026
    Guideline / consensusEnergy forThiamin
  30. Effects of thiamine supplementation on exercise-induced fatigue.
    Suzuki M; Itokawa Y · Metabolic brain disease · 1996
    Randomized trial16 participantsEnergy forThiamin
  31. Long-term maintenance treatment with 300 mg thiamine for fatigue in patients with inflammatory bowel disease: results from an open-label extension of the TARIF study.
    Bager P; Hvas CL; Rud CL; Dahlerup JF · Scandinavian journal of gastroenterology · 2022
    Randomized trialEnergy forThiamin