21st Century One Daily Women's
vs
Metagenics Testralin
Supplement Comparison

  • Vitamin D: 21st Century One Daily Women's has 2.7× more
  • Zinc: 21st Century One Daily Women's has 3.2× more
  • Vitamin B12 (Cobalamin): Metagenics Testralin has 56% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 51 nutrients compared
Bar chart: per-serving label amounts and listed forms for 21st Century One Daily Women's vs Metagenics Testralin.

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Frequently asked questions

Which active ingredients does 21st Century One Daily Women's have?

  • Vitamin A appears as Retinyl Acetate
  • Vitamin C appears as Ascorbic Acid
  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin E appears as dl-Alpha Tocopheryl Acetate
  • Vitamin B1 (Thiamin) appears as Thiamin Mononitrate
  • Vitamin B2 (Riboflavin) appears as Riboflavin
  • Vitamin B3 (Niacin) appears as Niacinamide
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl
  • Vitamin B9 (Folate) appears as Folic Acid
  • Vitamin B12 (Cobalamin) appears as Cyanocobalamin
  • Vitamin B7 (Biotin) appears as D-Biotin
  • Vitamin B5 (Pantothenic Acid) appears as D-Calcium Pantothenate
  • Calcium appears as Calcium Carbonate
  • Iron appears as Ferrous Fumarate
  • Iodine appears as Potassium Iodide
  • Magnesium appears as Magnesium Oxide
  • Zinc appears as Zinc Oxide
  • Selenium appears as Sodium Selenate
  • Copper appears as Copper Sulfate

Which active ingredients does Metagenics Testralin have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl
  • Vitamin B9 (Folate) appears as Calcium-L-5-methyltetrahydrofolate
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • Zinc appears as Zinc Citrate
  • Selenium appears as L-Selenomethionine
  • Lycopene
  • Betaine Hydrochloride appears as Betaine HCl
  • Turmeric appears as Turmeric Root Extract (Curcuma longa) (rhizome) (Standardized to 95% Curcuminoids)
  • Green Tea appears as Decaffeinated Green Tea Extract (Camellia sinensis leaf, standardized to 60% catechins and 40% EGCG)
  • Soybean Extract appears as Soybean Concentrate
  • Total Isoflavones
  • Mixed Plant Sterols Complex
  • Oleanolic Acid appears as Oleanolic Acid from Olive Leaf Extract (Olea europaea)
  • Lignans appears as Lignans as Secoisolariciresinol Diglucosides (SDG) from Flaxseed Extract

Which categories do 21st Century One Daily Women's and Metagenics Testralin belong to?

  • Multivitamin
  • Hormone Support Formula

What health concerns do 21st Century One Daily Women's and Metagenics Testralin address?

  • General Health
  • Women's Health
  • Hormonal Balance
  • Men's Health

Which product has a higher amount of Vitamin D per serving?

  • 21st Century One Daily Women's has the highest total amount of Vitamin D: 1000 IU per serving

Which product has a higher amount of Zinc per serving?

  • 21st Century One Daily Women's has the highest total amount of Zinc: 8 mg per serving

Which product has a higher amount of Vitamin B12 (Cobalamin) per serving?

  • Metagenics Testralin has the highest total amount of Vitamin B12 (Cobalamin): 15 mcg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • 21st Century One Daily Women's: 1 tablet
    • Metagenics Testralin: 1 tablet
  • Vitamin A
    • This supplement has 700 mcg RAE
    • Recommended Dietary Allowance in men: 900 mcg RAE
    • Recommended Dietary Allowance in women: 700 mcg RAE
    • Tolerable Upper Intake Level: 3000 mcg RAE
  • Vitamin C
    • This supplement has 90 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin D
    • This supplement has 1000 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Vitamin E
    • This supplement has 15 mg
    • Recommended Dietary Allowance in men: 15 mg
    • Recommended Dietary Allowance in women: 15 mg
    • Tolerable Upper Intake Level: 1000 mg
  • Vitamin B1 (Thiamin)
    • This supplement has 2.4 mg
    • Recommended Dietary Allowance in men: 1.2 mg
    • Recommended Dietary Allowance in women: 1.1 mg
    • Tolerable Upper Intake Level: Not established
  • Vitamin B2 (Riboflavin)
    • This supplement has 1.95 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.1 mg
    • Tolerable Upper Intake Level: Not established
  • Vitamin D
    • This supplement has 375 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Vitamin B6 (Pyridoxine)
    • This supplement has 25 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.3 mg
    • Tolerable Upper Intake Level: 100 mg
  • Vitamin B9 (Folate)
    • This supplement has 330 mcg DFE
    • Recommended Dietary Allowance in men: 400 mcg DFE
    • Recommended Dietary Allowance in women: 400 mcg DFE
    • Tolerable Upper Intake Level: 1000 mcg DFE
  • Vitamin B12 (Cobalamin)
    • This supplement has 15 mcg
    • Recommended Dietary Allowance in men: 2.4 mcg
    • Recommended Dietary Allowance in women: 2.4 mcg
    • Tolerable Upper Intake Level: Not established
  • Zinc
    • This supplement has 2.5 mg
    • Recommended Dietary Allowance in men: 11 mg
    • Recommended Dietary Allowance in women: 8 mg
    • Tolerable Upper Intake Level: 40 mg
  • Selenium
    • This supplement has 100 mcg
    • Recommended Dietary Allowance in men: 55 mcg
    • Recommended Dietary Allowance in women: 55 mcg
    • Tolerable Upper Intake Level: 400 mcg

Last updated: February 20, 2026

  • Sources & Methodology: Nutrient data and forms are taken directly from Supplement Facts labels. Reviewed and standardized by the VIOscan Research Team. Learn more on the Methodology page.
  • We show the Recommended Dietary Allowance (RDA) when available. If no RDA exists, we show the Adequate Intake (AI). Tolerable Upper Intake Levels (UL) are used for upper limits. Unless otherwise noted, RDAs shown correspond to healthy adults aged 19–50 years and are sex-specific. Separate values exist for 51–70 years and >70 years, and pregnancy and lactation are excluded. All values come from the Dietary Reference Intakes (DRIs) published by the National Academies of Sciences, Engineering, and Medicine (NASEM), Food and Nutrition Board (FNB).
  • Transparency: We’re funded by our users. We don’t have sponsors or affiliate links, and we don’t sell supplements.
  • Editorial standards: we provide independent, impartial and objective data analysis.
  • This analysis is for educational purposes only. It is not a substitute for medical advice.
  • Questions? Read our Frequently Asked Questions or contact us, we’re here to help.
  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team