California Gold Nutrition Multivitamin and Mineral Two-A-Day
vs
Douglas Laboratories Querciplex
Supplement Comparison

  • Vitamin C: California Gold Nutrition Multivitamin and Mineral Two-A-Day has 2.7× more
  • Quercetin: Douglas Laboratories Querciplex has 17× 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 California Gold Nutrition Multivitamin and Mineral Two-A-Day vs Douglas Laboratories Querciplex.

Frequently asked questions

Which active ingredients does California Gold Nutrition Multivitamin and Mineral Two-A-Day have?

  • Vitamin A appears as Beta Carotene and Retinyl Acetate
  • Vitamin C appears as Ascorbic Acid and Calcium Ascorbate
  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin E appears as d-Alpha Tocopheryl and Mixed Tocopherols
  • Vitamin B1 (Thiamin) appears as Thiamin HCl
  • Vitamin B2 (Riboflavin) appears as Riboflavin and Riboflavin 5-Phosphate Sodium
  • Vitamin B3 (Niacin) appears as Niacinamide
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl and Pyridoxal 5-Phosphate
  • Vitamin B9 (Folate) appears as 5-MTHF, L-5-Methyltetrahydrofolate Calcium
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • Vitamin B7 (Biotin) appears as D-Biotin
  • Vitamin B5 (Pantothenic Acid) appears as D-Calcium Pantothenate
  • Iodine appears as Potassium Iodide
  • Magnesium appears as Magnesium Oxide and Magnesium Bisglycinate
  • Zinc appears as Zinc Citrate and Zinc Mono-L-Methionine Sulfate
  • Selenium appears as Selenium Yeast
  • Manganese appears as Manganese Citrate and Manganese Gluconate
  • Chromium appears as Chromium Chloride stabilized with Phyllanthus emblica (Amla) Fruit Extract Shilajit Extract
  • Molybdenum appears as Molybdenum Glycinate
  • Boron appears as Boron Chelate
  • Lycopene
  • Inositol
  • Alpha Lipoic Acid
  • Quercetin appears as Quercetin Phytosome
  • Zeaxanthin appears as Zeaxanthin Marigold Flower Extract
  • Apigenin appears as Apigenin (from Chamomile Extract) (Matricaria recutita) (flower)

Which active ingredients does Douglas Laboratories Querciplex have?

  • Vitamin C appears as Ascorbic Acid
  • Quercetin appears as Quercefit Quercetin Phytosome (Sophora japonica extract flower sunflower phospholipid complex)
  • Bromelain appears as Bromelain (Ananas comosus stem)

Which categories do California Gold Nutrition Multivitamin and Mineral Two-A-Day and Douglas Laboratories Querciplex belong to?

  • Multivitamin
  • Antioxidant Complex
  • Herbal Extract

What health concerns do California Gold Nutrition Multivitamin and Mineral Two-A-Day and Douglas Laboratories Querciplex address?

  • Antioxidant Support
  • Energy & Metabolism
  • General Health
  • Immune System Support
  • Respiratory Health

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

  • California Gold Nutrition Multivitamin and Mineral Two-A-Day has the highest total amount of Vitamin C: 270 mg per serving

Which product has a higher amount of Quercetin per serving?

  • Douglas Laboratories Querciplex has the highest total amount of Quercetin: 250 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • California Gold Nutrition Multivitamin and Mineral Two-A-Day: 2 capsules
    • Douglas Laboratories Querciplex: 1 capsule
  • 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 270 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 2000 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 65 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 75 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 50 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.1 mg
    • Tolerable Upper Intake Level: Not established
  • Vitamin C
    • This supplement has 100 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg

Last updated: January 2, 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.
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  • Author: VIOscan Research Team