Douglas Laboratories Quercetin-Bromelain Complex
vs
Protocol For Life Magnesium Citrate
Supplement Comparison

  • Magnesium: Protocol For Life Magnesium Citrate has 31× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 8 nutrients compared
Bar chart: per-serving label amounts and listed forms for Douglas Laboratories Quercetin-Bromelain Complex vs Protocol For Life Magnesium Citrate.

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Frequently asked questions

Which active ingredients does Douglas Laboratories Quercetin-Bromelain Complex have?

  • Vitamin C appears as Magnesium Ascorbate
  • Magnesium appears as Magnesium Ascorbate
  • Quercetin appears as Quercetin Dihydrate
  • Bromelain appears as Bromelain (Ananas comosus stem)

Which active ingredients does Protocol For Life Magnesium Citrate have?

  • Magnesium appears as Magnesium Citrate

Which categories do Douglas Laboratories Quercetin-Bromelain Complex and Protocol For Life Magnesium Citrate belong to?

  • Antioxidant Complex
  • Herbal Extract
  • Single Mineral

What health concerns do Douglas Laboratories Quercetin-Bromelain Complex and Protocol For Life Magnesium Citrate address?

  • Immune System Support
  • Respiratory Health
  • Muscle Support
  • General Health
  • Sleep Quality
  • Stress Management

Which product has a higher amount of Magnesium per serving?

  • Protocol For Life Magnesium Citrate has the highest total amount of Magnesium: 400 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Douglas Laboratories Quercetin-Bromelain Complex: 1 tablet
    • Protocol For Life Magnesium Citrate: 2 tablets
  • Vitamin C
    • This supplement has 200 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg

Last updated: February 9, 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