Swanson Just One Complete Multi
vs
21st Century Mega Multi for Men
Supplement Comparison

  • Vitamin D: Swanson Just One Complete Multi has 2.0× more
  • Magnesium: same total amount on both labels
  • Vitamin C: 21st Century Mega Multi for Men has 3.3× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 53 nutrients compared
Bar chart: per-serving label amounts and listed forms for Swanson Just One Complete Multi vs 21st Century Mega Multi for Men.

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Frequently asked questions

Which active ingredients does Swanson Just One Complete Multi have?

  • Vitamin A appears as Retinyl Acetate
  • Vitamin C appears as Ascorbic Acid
  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin E appears as d-Alpha Tocopheryl Acid Succinate
  • Vitamin K appears as Vitamin K1 Phytonadione
  • Vitamin B1 (Thiamin) appears as Thiamin Mononitrate
  • Vitamin B2 (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)
  • Vitamin B5 (Pantothenic Acid) appears as Calcium Pantothenate
  • Calcium
  • Iodine appears as Potassium Iodide
  • Magnesium appears as Magnesium Oxide
  • Selenium
  • Copper
  • Manganese
  • Chromium
  • Molybdenum
  • Potassium

Which active ingredients does 21st Century Mega Multi for Men have?

  • Vitamin A appears as Beta Carotene
  • Vitamin C appears as Ascorbic Acid
  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin E appears as d-Alpha Tocopheryl Acid Succinate
  • Vitamin K appears as Vitamin K1 Phytonadione
  • 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)
  • Vitamin B5 (Pantothenic Acid) appears as D-Calcium Pantothenate
  • Choline appears as Choline Bitartrate
  • PABA
  • Calcium appears as Calcium Citrate
  • Iodine appears as Potassium Iodide
  • Magnesium appears as Magnesium Oxide
  • Zinc appears as Zinc Oxide
  • Selenium appears as Selenium Yeast
  • Copper appears as Copper Oxide
  • Manganese appears as Manganese Gluconate
  • Chromium appears as Chromium Picolinate
  • Silicon appears as Silicon Dioxide
  • Lutein
  • Lycopene
  • Inositol
  • Alpha Lipoic Acid
  • Citrus Bioflavonoid Complex
  • Korean Ginseng
  • L-Cysteine
  • Saw Palmetto
  • Stinging Nettle (Urtica dioica) Root
  • Garlic (Allium sativum)
  • Damiana (Turnera aphrodisiaca) Leaf
  • Oat Straw (Avena sativa) Aerial
  • Oyster Extract
  • Pumpkin (Cucurbita pepo) Seed
  • dl-Methionine

Which categories do Swanson Just One Complete Multi and 21st Century Mega Multi for Men belong to?

  • Multivitamin

What health concerns do Swanson Just One Complete Multi and 21st Century Mega Multi for Men address?

  • General Health
  • Antioxidant Support
  • Energy & Metabolism
  • Immune System Support
  • Men's Health

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

  • Swanson Just One Complete Multi has the highest total amount of Vitamin D: 400 IU per serving

Which product has a higher amount of Magnesium per serving?

  • Both products list the same total amount of Magnesium per serving

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

  • 21st Century Mega Multi for Men has the highest total amount of Vitamin C: 300 mg per serving

Which product has a higher amount of Calcium per serving?

  • 21st Century Mega Multi for Men has the highest total amount of Calcium: 210 mg per serving

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

  • 21st Century Mega Multi for Men has the highest total amount of Vitamin B12 (Cobalamin): 30 mcg per serving

Which product has a higher amount of Vitamin B9 (Folate) per serving?

  • Both products list the same total amount of Vitamin B9 (Folate) per serving

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

  • 21st Century Mega Multi for Men has the highest total amount of Vitamin K: 75 mcg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Swanson Just One Complete Multi: 1 tablet
    • 21st Century Mega Multi for Men: 2 tablets
  • Vitamin A
    • This supplement has 1500 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 400 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 20 mg
    • Recommended Dietary Allowance in men: 15 mg
    • Recommended Dietary Allowance in women: 15 mg
    • Tolerable Upper Intake Level: 1000 mg
  • Vitamin K
    • This supplement has 25 mcg
    • Adequate Intake in men: 120 mcg
    • Adequate Intake in women: 90 mcg
    • Tolerable Upper Intake Level: Not established
  • Vitamin B1 (Thiamin)
    • This supplement has 2.3 mg
    • Recommended Dietary Allowance in men: 1.2 mg
    • Recommended Dietary Allowance in women: 1.1 mg
    • Tolerable Upper Intake Level: Not established
  • Vitamin A
    • This supplement has 3000 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 300 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 200 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 67 mg
    • Recommended Dietary Allowance in men: 15 mg
    • Recommended Dietary Allowance in women: 15 mg
    • Tolerable Upper Intake Level: 1000 mg
  • Vitamin K
    • This supplement has 75 mcg
    • Adequate Intake in men: 120 mcg
    • Adequate Intake in women: 90 mcg
    • Tolerable Upper Intake Level: Not established
  • Vitamin B1 (Thiamin)
    • This supplement has 30 mg
    • Recommended Dietary Allowance in men: 1.2 mg
    • Recommended Dietary Allowance in women: 1.1 mg
    • Tolerable Upper Intake Level: Not established

Last updated: February 19, 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