Product Image

B-100 Complex

21st Century
4.7
★ ★ ★ ★ ★
(4991 ratings)
Thiamin 100 mg
Niacin 100 mg
Riboflavin 100 mg
Vitamin B5 100 mg
Vitamin B6 100 mg
Vitamin B12 100 mcg
Product Image
Score79

A conventional B-100 tablet with broad coverage and straightforward dosing. The 100 mg vitamin B6 amount is a major long-term trade-off.

How scoring works
Quantity:60 Tablet(s) • (60 servings)
Goals:
Energy
General Health
Heart Health
Metabolism Boost

Score 79

A conventional B-100 tablet with broad coverage and straightforward dosing. The 100 mg vitamin B6 amount is a major long-term trade-off.

How scoring works

Also available as

1 option
50 mg • 60 Tablet(s) servings B1 50 mg, B3 50 mg +2 more • 60 Tablet(s) • 60 servings $5.37 ($0.08 per serving)
$9.49($0.15 per serving)
Pure Formulas
$ 10.06
iHerb
$ 9.49
Report prices

Analysis

The formula supplies 100 mg each of thiamine, riboflavin, niacinamide, vitamin B6, and pantothenic acid. Folate, cyanocobalamin, biotin, and 160 mg calcium complete the stated profile.

Most vitamins use conventional forms rather than activated alternatives. The calcium amount is useful to know but does not turn the product into meaningful bone-mineral coverage.

The one-tablet serving may appeal to users seeking a classic B-100 formula. Prolonged daily use is difficult to justify without a clear need because the pyridoxine amount is very high.

Who is it for
  • Adults seeking a classic B-100 formula
  • People preferring tablets
  • Users taking high-potency B vitamins with guidance
Best for
  • Short-term broad B-vitamin intake
  • Normal energy metabolism
  • High-dose thiamine and riboflavin coverage

Pros

  • Broad B-vitamin coverage
  • Clearly disclosed amounts
  • Includes 160 mg calcium
  • One-tablet serving

Cons

  • 100 mg vitamin B6 is very high
  • Uses conventional forms
  • No choline or inositol
  • Not well balanced for routine use

Warnings

  • Long-term daily use of 100 mg vitamin B6 may cause nerve symptoms
  • Avoid other high-dose vitamin B6 products while using it
  • People managing calcium intake should account for the 160 mg contribution

Nutrient quality

68 High impact

The complete B-vitamin profile provides substantial metabolic cofactors in a focused formula. Conventional forms and an excessive vitamin B6 amount make the design less suitable for routine long-term use.

Ingredient transparency

84 Highest impact

The major B vitamins have separate amounts and no hidden blend obscures the core formula. Complete usage directions and the inactive-ingredient list are not supplied here.

Customer satisfaction

77 High impact

The very strong average rating is supported by a large review base. No review excerpts describe tolerance, effectiveness, or repeated complaints, so those experiences remain uncertain.

Value for money

86 Highest impact

A simple, inexpensive B-complex delivers substantial nutrient amounts. Basic forms and excessive vitamin B6 prevent it from being a balanced long-term value.

Report analysis

Goals

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

A complete B-vitamin set directly supports carbohydrate, fat, and protein metabolism. Thiamin, riboflavin, niacin, vitamin B6, and pantothenic acid are all supplied at very high amounts.

The formula does not address acute alertness, stress resilience, or major mitochondrial cofactors such as CoQ10. The very high vitamin B6 amount is not appropriate for indefinite routine use.

Study evidence
Riboflavin Mixed 6 studies
Thiamin Disputed 12 studies
General Health
Daily Energy Vitality
General Health
Impact
High effect
B Goal FitC- Strength of SupportB- CoverageB- Formula Quality
Folate · 667 mcg DFEVitamin B12 · 100 mcg

A broad set of B vitamins supports normal energy metabolism and helps fill common dietary gaps. The formula is more relevant to foundational nutrition than a single stimulant-style energy ingredient.

Several vitamins use basic forms, including cyanocobalamin and pyridoxine hydrochloride. The very large vitamin B6 amount makes routine long-term use less balanced than the broad label suggests.

Study evidence
Vitamin B12 Adverse 66 studies
Heart Health
Heart Health
Impact
Moderate effect
C Goal FitC Strength of SupportC CoverageC+ Formula Quality
Vitamin B12 · 100 mcgVitamin B6 · 100 mgFolate · 667 mcg DFE

B vitamins offer a plausible homocysteine-support pathway, but several forms are conventional rather than bioactive. The 100 mg pyridoxine dose is unnecessarily high for routine long-term use.

Folate, B6, and B12 create a coherent metabolic combination. Cyanocobalamin, ordinary folate, and the high B6 exposure reduce confidence in sustained heart-focused use.

Study evidence
Folate Supportive 116 studies
Vitamin B12 No effect 42 studies
Vitamin B6 Supportive 44 studies
Metabolism Boost
Metabolism Boost
Impact
Moderate effect
C- Goal FitC Strength of SupportD+ CoverageA- Formula Quality
Biotin · 100 mcgNiacin · 100 mgVitamin B12 · 100 mcgRiboflavin · 100 mgThiamin · 100 mgVitamin B5 · 100 mgVitamin B6 · 100 mg

A simple high-dose B-complex supplies the cofactors required for cellular energy production. It does not directly address thermogenesis, thyroid activity, mitochondrial transport, or glucose control.

Clear amounts and a streamlined label are strengths, but standard forms and excessive B6 weaken everyday suitability. Daily long-term use of 100 mg vitamin B6 carries a meaningful risk of tingling, numbness, or other nerve symptoms.

Study evidence
Riboflavin Mixed 5 studies
Vitamin B6 Supportive 16 studies

Ingredients

IngredientAmount per serving
Vitamin B1 (Thiamine Mononitrate)
 100 mg
Vitamin B2 (Riboflavin)
 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 (D-Calcium Pantothenate)
 100 mg
Calcium (Calcium Carbonate, Dicalcium Phosphate)
 160 mg
Gluten Free Adults 18–50
Report overview
Thiamin (Thiamine Mononitrate) · 100 mg OverallScore88
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The formula uses thiamine mononitrate, a standard water-soluble thiamin source. The clearly stated amount reaches the high-potency range, although the conventional delivery format offers no special absorption advantage. A low serving cost and substantial dose make the active-dose value favorable for a B-complex.

View ingredientView products
Niacin (Niacinamide) · 100 mg OverallScore78
B- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyC Value

The niacinamide dose is clearly disclosed and fits general supplementation. Its hard tablet lacks a stated release advantage, though the form itself avoids the typical nicotinic-acid flush. The broad B-complex is offered at a reasonably efficient serving cost.

View ingredientView products
Riboflavin · 100 mg OverallScore74
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The 100 mg serving provides high-potency support, but standard riboflavin requires conversion to its active coenzyme form. The hard-pressed one tablet may release more slowly, although no unnecessary artificial additives are listed. The serving offers exceptional value for its form and potency.

View ingredientView products
Loading alternative details
81 Performance

Fully Active B Complex with Quatrefolic

Doctor's Best
<p>Its label clearly provides 40 mg of Vitamin C as Ascorbic Acid, making it a more clearly defined vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5 option. Compared with the original, its ingredient and goal alignment is stronger, although the input does not provide independent testing or absorption evidence.</p>
78 Performance

Active B-Complex

Integrative Therapeutics
<p>Its label clearly provides 50 mg of Thiamine as Thiamine Hydrochloride, making it a more clearly defined vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5 option. Compared with the original, its ingredient and goal alignment is stronger, although the input does not provide independent testing or absorption evidence.</p>
85 Performance

B-Complex Plus

Pure Encapsulations
<p>Its label clearly provides 100 mg of Thiamine as Thiamine Hydrochloride, making it a more clearly defined vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5 option. Compared with the original, its ingredient and goal alignment is stronger, although the input does not provide independent testing or absorption evidence.</p>
80 Budget

B-Complex '100'

Solgar
<p>Its label clearly provides 100 mg of Thiamine as Thiamine Mononitrate, preserving relevant vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5 coverage. Compared with the original, it lowers the serving cost, although the input does not provide independent testing or absorption evidence.</p>
76 Budget

B-100

NOW
<p>Its label clearly provides 100 mg of Thiamine as Thiamine Hydrochloride, preserving relevant vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5 coverage. Compared with the original, it lowers the serving cost, although the input does not provide independent testing or absorption evidence.</p>
63 Budget

Ultra B-100 Complex

Mason Natural
<p>Its label clearly provides 100 mg of Vitamin B1 as Thiamine Hydrochloride, preserving relevant vitamin b12 and thiamin and vitamin b6 and riboflavin and vitamin b5 coverage. Compared with the original, it lowers the serving cost, although it does not retain the original product’s niacin coverage.</p>
81 Value

Coenzyme B-Complex Caps

Country Life
<p>Its label clearly provides 50 mg of Thiamin as Thiamine Cocarboxylase Chloride, keeping the formula relevant to vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5. Compared with the original, the somewhat higher serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
85 Value

BioCoenzymated Active B Complex

Natural Factors
<p>Its label clearly provides 10 mg of Riboflavin as Riboflavin 5-Phosphate, keeping the formula relevant to vitamin b12 and niacin and thiamin and vitamin b6 and riboflavin and vitamin b5. Compared with the original, the somewhat higher serving cost and ingredient detail create a useful quality-to-cost balance, although the input does not provide independent testing or absorption evidence.</p>
73 Value

B-50 Gels

Carlson
<p>Its label clearly provides 1 g of Total Fat, keeping the formula relevant to niacin and thiamin and vitamin b6 and riboflavin and vitamin b5. Compared with the original, the somewhat higher serving cost and ingredient detail create a useful quality-to-cost balance, although it does not retain the original product’s vitamin b12 coverage.</p>
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  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. 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
  8. 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 Metabolism Boost forRiboflavin
  9. 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
  10. 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
  11. 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
  12. Effects of thiamine supplementation on exercise-induced fatigue.
    Suzuki M; Itokawa Y · Metabolic brain disease · 1996
    Randomized trial16 participantsEnergy forThiamin
  13. 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
  14. Oral Vitamin B12 versus Placebo for the Prevention of Chemotherapy-Induced Peripheral Neuropathy in Gynecological Cancer Patients: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Insin P; Chaiwongsa T; Prueksaritanond N · Asian Pacific journal of cancer prevention : APJCP · 2026
    Randomized trial40 participantsGeneral Health forVitamin B12
  15. Vitamin B12 Supplementation in Diabetic Neuropathy: A 1-Year, Randomized, Double-Blind, Placebo-Controlled Trial.
    Didangelos T; Karlafti E; Kotzakioulafi E; Margariti E; Giannoulaki P; Batanis G; Tesfaye S; Kantartzis K · Nutrients · 2021
    Randomized trial90 participantsGeneral Health forVitamin B12
  16. A single-center randomized controlled trial of local methylcobalamin injection for subacute herpetic neuralgia.
    Xu G; Lv ZW; Feng Y; Tang WZ; Xu GX · Pain medicine (Malden, Mass.) · 2014
    Randomized trial98 participantsGeneral Health forVitamin B12
  17. Local Injection of Methylcobalamin Combined with Lidocaine for Acute Herpetic Neuralgia.
    Xǔ G; Xu S; Tang WZ; Xú G; Cheng C; Xu J · Pain medicine (Malden, Mass.) · 2017
    Randomized trial204 participantsGeneral Health forVitamin B12
  18. The Effect of Vitamin B12 and Folic Acid Supplementation on Serum Homocysteine, Anemia Status and Quality of Life of Patients with Multiple Sclerosis.
    Nozari E; Ghavamzadeh S; Razazian N · Clinical nutrition research · 2022
    Clinical trial50 participantsGeneral Health forVitamin B12
  19. Folic Acid Therapy Reduces the First Stroke Risk Associated With Hypercholesterolemia Among Hypertensive Patients.
    Qin X; Li J; Spence JD; Zhang Y; Li Y; Wang X; Wang B; Sun N; Chen F; Guo J; Yin D; Sun L; Tang G; He M; Fu J; Cai Y; Shi X; Ye P; Chen H; Zhao S; Chen M; Gao C; Kong X; Hou FF; Huang Y; Huo Y · Stroke · 2017
    Randomized trial20,702 participantsHeart Health forFolate
  20. Periconception Red Blood Cell Folate and Offspring Congenital Heart Disease : Nested Case-Control and Mendelian Randomization Studies.
    Chen H; Zhang Y; Wang D; Chen X; Li M; Huang X; Jiang Y; Dou Y; Wang Y; Ma X; Sheng W; Jia B; Yan W; Huang G; SPCC (Shanghai Preconception Cohort) Group · Annals of internal medicine · 2022
    Case-control study985 participantsHeart Health forFolate
  21. Intake of vitamin B6, folate, and vitamin B12 and risk of coronary heart disease: a systematic review and dose-response meta-analysis of prospective cohort studies.
    Jayedi A; Zargar MS · Critical reviews in food science and nutrition · 2020
    Meta-analysis369,746 participants11 studies pooledHeart Health forFolate Heart Health forVitamin B6
  22. Folate Biomarkers, Folate Intake, and Risk of Death From All Causes, Cardiovascular Disease, and Cancer: A Systematic Review and Dose-Response Meta-Analysis of Prospective Cohort Studies.
    Fallah M; Karim Dehnavi M; Lotfi K; Aminianfar A; Azadbakht L; Esmaillzadeh A · Nutrition reviews · 2025
    Meta-analysis423,304 participants25 studies pooledHeart Health forFolate
  23. The association between folic acid supplementation and congenital heart defects: Systematic review and meta-analysis.
    Wondemagegn AT; Afework M · SAGE open medicine · 2022
    Meta-analysis37 studies pooledHeart Health forFolate
  24. Vitamin B12 deficiency is associated with cardiovascular autonomic neuropathy in patients with type 2 diabetes.
    Hansen CS; Jensen JS; Ridderstråle M; Vistisen D; Jørgensen ME; Fleischer J · Journal of diabetes and its complications · 2018
    Cross-sectional study469 participantsHeart Health forVitamin B12
  25. Vitamin B12 Status and Cardiovascular Risk: Novel Insights from NMR-Based Lipoprotein Profiling in 20,665 Adults.
    Eken Y; Tekin N; Şahin F; Tay İ; Yıldırım Saral N; Serteser M; Baykal AT · Journal of clinical medicine · 2026
    Cross-sectional study20,665 participantsHeart Health forVitamin B12
  26. Vitamin B12 and folate status in early pregnancy and cardiometabolic risk factors in the offspring at age 5-6 years: findings from the ABCD multi-ethnic birth cohort.
    Krikke GG; Grooten IJ; Vrijkotte TG; van Eijsden M; Roseboom TJ; Painter RC · BJOG : an international journal of obstetrics and gynaecology · 2016
    Cohort study1,950 participantsHeart Health forVitamin B12
  27. Orthostatic tolerance in older patients with vitamin B12 deficiency before and after vitamin B12 replacement.
    Moore A; Ryan J; Watts M; Pillay I; Clinch D; Lyons D · Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2004
    Non-randomized trial16 participantsHeart Health forVitamin B12
  28. The impact of folic acid/VB12 deficiency on essential hypertension in children and adolescents: from a nested case-control and a cohort study.
    Liang X; Huang D; Bi Y; He Y; Mao T; Liu Q; Hu G; Tong J; Chen L; Wang Y; An X; Jiang X; Tahir MF · Journal of human hypertension · 2024
    Observational study596 participantsHeart Health forVitamin B12
  29. Folate and vitamin B6 from diet and supplements in relation to risk of coronary heart disease among women.
    Rimm EB; Willett WC; Hu FB; Sampson L; Colditz GA; Manson JE; Hennekens C; Stampfer MJ · JAMA · 1998
    Cohort study80,082 participantsHeart Health forVitamin B6
  30. Intake of folate, vitamin B6 and vitamin B12 and the risk of CHD: the Japan Public Health Center-Based Prospective Study Cohort I.
    Ishihara J; Iso H; Inoue M; Iwasaki M; Okada K; Kita Y; Kokubo Y; Okayama A; Tsugane S; JPHC Study Group · Journal of the American College of Nutrition · 2008
    Cohort study40,803 participantsHeart Health forVitamin B6
  31. The effect of B-vitamins on the prevention and treatment of cardiovascular diseases: a systematic review and meta-analysis.
    Miao Y; Guo Y; Chen Y; Lin Y; Lu Y; Guo Q · Nutrition reviews · 2024
    Meta-analysisHeart Health forVitamin B6
  32. Folate and vitamin B(6) intake and risk of acute myocardial infarction in Italy.
    Tavani A; Pelucchi C; Parpinel M; Negri E; La Vecchia C · European journal of clinical nutrition · 2005
    Case-control study985 participantsHeart Health forVitamin B6
  33. Effects of riboflavin and folic acid supplementation on plasma homocysteine levels in healthy subjects.
    Chuang CZ; Boyles A; Legardeur B; Su J; Japa S; Lopez-S A · The American journal of the medical sciences · 2006
    Non-randomized trial34 participantsMetabolism Boost forRiboflavin
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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