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B-100 Complex

21st Century
4.7
★ ★ ★ ★ ★
(4864 ratings)
Thiamin 100 mg
Niacin 100 mg
Riboflavin 100 mg
Vitamin B5 100 mg
Vitamin B6 100 mg
Product Image
Score93

A very affordable, high-potency B-complex tablet for basic energy and metabolic support.

How scoring works
Quantity:60 Tablet(s) • (60 servings)
Goals:
Stress Relief
Metabolism Boost
Energy
Brain Health
Skin Health
Cognitive Support

Score 93

A very affordable, high-potency B-complex tablet for basic energy and metabolic support.

How scoring works

Also available as

1 option
50 mg • 60 Tablet(s) servings B3 50 mg, B1 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
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Analysis

This B-100 complex is all about affordability and high dosage. It provides 100mg of most B vitamins, which can really help support your metabolism and daily energy levels. While it uses basic synthetic forms, it's a very practical way to get the foundational nutrients your body needs to handle stress.

I like that it adds a bit of calcium to the mix, which helps stabilize the tablets. It fits best for someone who isn't sensitive to synthetic vitamins and wants a simple daily supplement. It's a straightforward, no-frills product that gets the job done for a very low price.

Pros

  • Excellent price per serving
  • Provides 100mg of most B vitamins
  • Simple, daily one-tablet serving
  • Includes extra calcium for stability

Cons

  • Uses basic synthetic forms only
  • May have artificial dyes or coatings
  • Low bioavailability for some ingredients

Warnings

  • Tablets might be large and hard to swallow
  • High niacin dose can cause temporary skin redness
  • Not recommended for those with absorption issues

Nutrient quality

81 Highest impact

Every B-vitamin is present in a high-potency 100mg/mcg dose, providing broad support for metabolic pathways. While standard synthetic forms are used, the dosages are material and aligned with general wellness goals.

Ingredient transparency

98 Highest impact

The label provides specific amounts for every active ingredient, allowing for an accurate assessment of formula potency. Labeling is straightforward, although the chemical forms are listed clearly for technical review.

Customer satisfaction

95 Highest impact

The product has earned a strong rating from thousands of reviews, confirming its reliability as a budget-friendly option. Users frequently mention improved energy levels and the excellent price-to-potency ratio.

Value for money

99 Highest impact

At 15 cents per serving, this complex offers outstanding value for a high-potency B-100 formula. The extremely low cost makes it a very attractive choice for long-term daily supplementation.

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Goals

Stress Relief
Impact
Highest effect
B Goal FitB+ Strength of SupportA CoverageA+ Formula Quality

A full spectrum of B-vitamins at 100mg per serving provides broad metabolic support for the nervous system and adrenal glands. These nutrients are essential cofactors for the production of energy and neurotransmitters, helping the body handle chronic stress.

While high-dose B-complexes provide essential foundational support, they do not offer the same acute relaxation as adaptogens or inhibitory amino acids. This formula appears well aligned for users seeking to support their long-term physiological resilience to daily pressures.

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Metabolism Boost
Impact
Highest effect
A- Goal FitA- Strength of SupportB- CoverageA+ Formula Quality

This B-100 complex delivers potent doses of essential vitamins that support the body's natural enzymatic energy production. Ingredients like thiamine and riboflavin are necessary for metabolizing macronutrients into cellular energy.

The inclusion of calcium carbonate and dicalcium phosphate likely serves as stabilizers for the tablet format. While providing excellent enzymatic support for cellular energy, the formula lacks direct thermogenic or thyroid-stimulating agents.

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Energy
Impact
Highest effect
A+ Goal FitB Strength of SupportB- CoverageA- Formula Quality

A high-potency B-complex is utilized to provide the enzymatic cofactors required for energy metabolism.

While potently dosed, the use of basic chemical forms and hard tablets may affect biological availability.

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Brain Health
Impact
Highest effect
A- Goal FitB Strength of SupportB- CoverageA- Formula Quality

Delivers high doses of essential B-vitamins in a B-Complex '100' format to support energy production and neurotransmitter synthesis in the brain. Foundational nutrients like Thiamine, Riboflavin, and Niacinamide are critical for maintaining mental focus and cognitive endurance.

Potency is high, though the reliance on synthetic forms like Pyridoxine HCl and Cyanocobalamin is less ideal than bioactive methyl-forms. This complex provides robust nutritional support for individuals needing a strong base for their metabolic and neurological health.

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Skin Health
Impact
Highest effect
B+ Goal FitB+ Strength of SupportB CoverageB- Formula Quality

Niacinamide and Pantothenic acid are provided in high concentrations to support skin barrier function and moisture retention. The inclusion of biotin may further contribute to the synthesis of keratin, which is essential for skin structure.

This B-complex appears well aligned with skin health due to its broad support for cellular metabolism. However, the presence of artificial dyes in this brand's tablets may be a concern for individuals with sensitive systems.

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Cognitive Support
Impact
High effect
C+ Goal FitB- Strength of SupportC CoverageA- Formula Quality

Thiamine, vitamin B6, and vitamin B12 are provided in high doses to support the metabolic pathways that fuel brain energy. These essential vitamins are critical cofactors for the enzymes involved in neurotransmitter synthesis for focus.

Suitability for the selected goal appears strong for foundational mental energy support. The formula provides high-potency doses of B-vitamins, although it does not contain acute botanical nootropics.

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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
This high-potency B-complex tablet includes a 100mg dose of thiamin mononitrate to aid metabolic health. It is a budget-friendly option for comprehensive B-vitamin supplementation.
View ingredientView products
Niacin (Niacinamide) · 100 mg OverallScore84
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyC Value
This B-100 complex provides a reliable 100mg of niacinamide as part of a complete B-vitamin profile. It is a straightforward, budget-friendly option for daily metabolic and energy support.
View ingredientView products
Riboflavin · 100 mg OverallScore70
F Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyA+ Value
21st Century's B-100 Complex provides 100mg of riboflavin for a very low price. While it offers high potency, the tablet format and likely use of synthetic additives are notable weaknesses.
View ingredientView products
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94 Value

B-Complex '100'

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Solaray
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(7399 ratings)
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B-100 Complex with B2 Coenzyme

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4.7
★★★★★
(1068 ratings)
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Stress B-Complex

Thorne
4.8
★★★★★
(197 ratings)
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Other sellers (2)
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