21st Century One Daily, Maximum, 100 Tablets supplement bottle
21st Century

One Daily, Maximum, 100 Tablets

What We Researched
30 active ingredients analyzed · 11 inactive ingredients decoded · 2 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
53
Product Score Poor
76
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin A (as Acetate & 20% as Beta-Carotene) 750 mcg 83%
Vitamin C (as Ascorbic Acid) 60 mg 67%
Vitamin D3 (as Cholecalciferol) (400 IU) 10 mcg 50%
Vitamin E (as dl-Alpha Tocopheryl Acetate) 13.5 mg 90%
Vitamin K (as Phytonadione) 25 mcg 21%
Thiamin (as Thiamin Mononitrate, B-1) 1.5 mg 125%
Riboflavin (Vitamin B-2) 1.7 mg 131%
Niacin (as Niacinamide) 20 mg 125%
Vitamin B6 (as Pyridoxine HCl) 2 mg 118%
Folate (400 mcg Folic Acid) 667 mcg DFE 167%
Vitamin B-12 (as Cyanocobalamin) 6 mcg 250%
Biotin 30 mcg 100%
Pantothenic Acid (as d-Calcium Pantothenate) 10 mg 200%
Calcium (as Calcium Carbonate & Dicalcium Phosphate) 162 mg 12%
Iron (as Ferrous Fumarate) 18 mg 100%
Phosphorus (as Dicalcium Phosphate) 109 mg 9%
Iodine (as Potassium Iodide) 150 mcg 100%
Magnesium (as Magnesium Oxide) 100 mg 24%
Zinc (as Zinc Oxide) 15 mg 136%
Selenium (as Sodium Selenate) 20 mcg 36%
Copper (as Copper Sulfate) 2 mg 222%
Manganese (as Manganese Sulfate) 3.5 mg 152%
Chromium (as Chromium Chloride) 65 mcg 186%
Molybdenum (as Sodium Molybdate) 160 mcg 355%
Chloride (as Potassium Chloride) 72 mg 3%
Potassium (as Potassium Chloride) 80 mg 2%
Boron (as Sodium Borate) 150 mcg **
Tin (as Stannous Chloride) 10 mcg **
Silicon (as Silicon Dioxide) 2 mg **
Vanadium (as Sodium Metavanadate) 10 mcg **
Bioavailability Fair

Absorption Rating

  • Vitamin A (as Acetate & 20% as Beta-Carotene) Fair
  • Vitamin C (as Ascorbic Acid) Fair
  • Vitamin D3 (as Cholecalciferol) (400 IU) Good
  • Vitamin E (as dl-Alpha Tocopheryl Acetate) Poor
  • Vitamin K (as Phytonadione) Fair
  • Thiamin (as Thiamin Mononitrate, B-1) Fair
  • Riboflavin (Vitamin B-2) Good
  • Niacin (as Niacinamide) Good
  • Vitamin B6 (as Pyridoxine HCl) Fair
  • Folate (400 mcg Folic Acid) Fair
  • Vitamin B-12 (as Cyanocobalamin) Fair
  • Biotin Good
  • Pantothenic Acid (as d-Calcium Pantothenate) Good
  • Calcium (as Calcium Carbonate & Dicalcium Phosphate) Fair
  • Iron (as Ferrous Fumarate) Fair
  • Phosphorus (as Dicalcium Phosphate) Good
  • Iodine (as Potassium Iodide) Good
  • Magnesium (as Magnesium Oxide) Poor
  • Zinc (as Zinc Oxide) Poor
  • Selenium (as Sodium Selenate) Fair
  • Copper (as Copper Sulfate) Fair
  • Manganese (as Manganese Sulfate) Good
  • Chromium (as Chromium Chloride) Poor
  • Molybdenum (as Sodium Molybdate) Good
  • Chloride (as Potassium Chloride) Good
  • Potassium (as Potassium Chloride) Good
  • Boron (as Sodium Borate) Fair
  • Tin (as Stannous Chloride) Poor
  • Silicon (as Silicon Dioxide) Poor
  • Vanadium (as Sodium Metavanadate) Poor
Other Ingredients Very Poor

Fillers & Additives

  • Cellulose
  • Stearic Acid
  • Artificial colors (fd&c blue #2 carmine, fd&c red #40) High
  • Croscarmellose Sodium
  • Gelatin
  • Magnesium Silicate
  • Magnesium Stearate
  • PEG Medium
  • Polyvinyl Alcohol
  • Starch
  • Titanium Dioxide High
Efficacy Fair

Dosage Analysis

  • Vitamin A (as Acetate & 20% as Beta-Carotene) 750 mcg Effective
  • Vitamin C (as Ascorbic Acid) 60 mg Under-dosed
  • Vitamin D3 (as Cholecalciferol) (400 IU) 10 mcg Under-dosed
  • Vitamin E (as dl-Alpha Tocopheryl Acetate) 13.5 mg Under-dosed
  • Vitamin K (as Phytonadione) 25 mcg Under-dosed
  • Thiamin (as Thiamin Mononitrate, B-1) 1.5 mg Effective
  • Riboflavin (Vitamin B-2) 1.7 mg Effective
  • Niacin (as Niacinamide) 20 mg Effective
  • Vitamin B6 (as Pyridoxine HCl) 2 mg Effective
  • Folate (400 mcg Folic Acid) 667 mcg DFE Effective
  • Vitamin B-12 (as Cyanocobalamin) 6 mcg Effective
  • Biotin 30 mcg Effective
  • Pantothenic Acid (as d-Calcium Pantothenate) 10 mg Effective
  • Calcium (as Calcium Carbonate & Dicalcium Phosphate) 162 mg Under-dosed
  • Iron (as Ferrous Fumarate) 18 mg Effective
  • Phosphorus (as Dicalcium Phosphate) 109 mg Under-dosed
  • Iodine (as Potassium Iodide) 150 mcg Effective
  • Magnesium (as Magnesium Oxide) 100 mg Under-dosed
  • Zinc (as Zinc Oxide) 15 mg Effective
  • Selenium (as Sodium Selenate) 20 mcg Under-dosed
  • Copper (as Copper Sulfate) 2 mg Effective
  • Manganese (as Manganese Sulfate) 3.5 mg Effective
  • Chromium (as Chromium Chloride) 65 mcg Effective
  • Molybdenum (as Sodium Molybdate) 160 mcg Effective
  • Chloride (as Potassium Chloride) 72 mg Under-dosed
  • Potassium (as Potassium Chloride) 80 mg Under-dosed
  • Boron (as Sodium Borate) 150 mcg Under-dosed
  • Silicon (as Silicon Dioxide) 2 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin A (as Acetate & 20% as Beta-Carotene) 750 mcg 83%
Vitamin C (as Ascorbic Acid) 60 mg 67%
Vitamin D3 (as Cholecalciferol) (400 IU) 10 mcg 50%
Vitamin E (as dl-Alpha Tocopheryl Acetate) 13.5 mg 90%
Vitamin K (as Phytonadione) 25 mcg 21%
Thiamin (as Thiamin Mononitrate, B-1) 1.5 mg 125%
Riboflavin (Vitamin B-2) 1.7 mg 131%
Niacin (as Niacinamide) 20 mg 125%
Vitamin B6 (as Pyridoxine HCl) 2 mg 118%
Folate (400 mcg Folic Acid) 667 mcg DFE 167%
Vitamin B-12 (as Cyanocobalamin) 6 mcg 250%
Biotin 30 mcg 100%
Pantothenic Acid (as d-Calcium Pantothenate) 10 mg 200%
Calcium (as Calcium Carbonate & Dicalcium Phosphate) 162 mg 12%
Iron (as Ferrous Fumarate) 18 mg 100%
Phosphorus (as Dicalcium Phosphate) 109 mg 9%
Iodine (as Potassium Iodide) 150 mcg 100%
Magnesium (as Magnesium Oxide) 100 mg 24%
Zinc (as Zinc Oxide) 15 mg 136%
Selenium (as Sodium Selenate) 20 mcg 36%
Copper (as Copper Sulfate) 2 mg 222%
Manganese (as Manganese Sulfate) 3.5 mg 152%
Chromium (as Chromium Chloride) 65 mcg 186%
Molybdenum (as Sodium Molybdate) 160 mcg 355%
Chloride (as Potassium Chloride) 72 mg 3%
Potassium (as Potassium Chloride) 80 mg 2%
Boron (as Sodium Borate) 150 mcg **
Tin (as Stannous Chloride) 10 mcg **
Silicon (as Silicon Dioxide) 2 mg **
Vanadium (as Sodium Metavanadate) 10 mcg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Artificial colors (fd&c blue #2 carmine, fd&c red #40) Unknown
Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

Magnesium Silicate Generally_safe

It is used to improve powder flow and prevent clumping.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

PEG Caution

It is used as a binder, coating, or emulsifier.

Polyvinyl Alcohol Generally_safe

It is used as a coating for tablets or capsules.

Starch Generally_safe

It is used as a filler, binder, or thickener.

Titanium Dioxide Caution

Used as a whitening agent in tablet coatings and capsules.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$8$7$6$5$4 Mar 12 $6.00
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
21st Century

Founded 1991 · Tempe, Arizona, United States · 231 products · 21stcenturyvitamins.com/

Certifications

2 certifications
Consumerlab Verified
Nsf Gmp Verified Source

Transparency

4 claims
Third Party Testing Claim — Claimed Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

4 incidents
Prop 65 Lead2021-06-22Source
Recall Vitamin D3 5000 IU Tablets2021-05-19Source
Lawsuit False advertising of Glucosamine/Chondroitin supplements.2012Source
Prop 65 Lead2008-12-23Source
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Frequently Asked Questions
Is 21st Century One Daily, Maximum a good supplement?

21st Century One Daily, Maximum, 100 Tablets received a product quality score of 53/100 in GoodSupp's independent analysis, indicating several areas of concern that consumers should review. The product contains 30 active ingredients Of the 11 inactive ingredients, 5 are rated safe and 2 are flagged for review. The manufacturer, 21st Century, holds a brand trust score of 76/100 with 2 verified certifications including Consumerlab, Nsf Gmp.

What are the ingredients in 21st Century One Daily, Maximum?

21st Century One Daily, Maximum contains 30 active ingredients: Vitamin A (as Acetate & 20% as Beta-Carotene) (750 mcg), Vitamin C (as Ascorbic Acid) (60 mg), Vitamin D3 (as Cholecalciferol) (400 IU) (10 mcg), Vitamin E (as dl-Alpha Tocopheryl Acetate) (13.5 mg), Vitamin K (as Phytonadione) (25 mcg), Thiamin (as Thiamin Mononitrate, B-1) (1.5 mg), and 24 more. Notable high-dose ingredients include Vitamin B-12 at 250% DV, Copper at 222% DV, Molybdenum at 355% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is 21st Century One Daily, Maximum safe to take?

21st Century One Daily, Maximum, 100 Tablets has been analyzed for ingredient safety across all its components. Of 11 inactive ingredients, 5 are rated safe. 2 ingredients are flagged for review: PEG, Titanium Dioxide. 'Caution' doesn't mean dangerous — it indicates the ingredient has some considerations worth being aware of, such as potential sensitivities or ongoing research. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is 21st Century a trustworthy supplement brand?

21st Century receives a brand trust score of 76/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1991 and headquartered in Tempe, Arizona, United States, the company offers 231 products in their lineup. They hold 2 verified certifications including Consumerlab, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: 21st Century has 4 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.