Thorne L-Arginine Plus
vs
Metagenics Vitamin B-Complex
Supplement Comparison

  • Vitamin C: Thorne L-Arginine Plus has 2.4× more
  • Vitamin B9 (Folate): Thorne L-Arginine Plus has 38% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 27 nutrients compared
Bar chart: per-serving label amounts and listed forms for Thorne L-Arginine Plus vs Metagenics Vitamin B-Complex.

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Frequently asked questions

Which active ingredients does Thorne L-Arginine Plus have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B9 (Folate) appears as L-5-Methyltetrahydrofolate
  • L-Arginine
  • R-Lipoic Acid appears as Sodium R-Lipoic Acid
  • Resveratrol appears as Trans-Resveratrol
  • Green Tea appears as Green Tea Phytosome

Which active ingredients does Metagenics Vitamin B-Complex have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B1 (Thiamin) appears as Thiamin Mononitrate
  • Vitamin B2 (Riboflavin)
  • Vitamin B3 (Niacin) appears as Niacinamide and Niacin
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl
  • Vitamin B9 (Folate) appears as Calcium L-5-Methyltetrahydrofolate
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • Vitamin B7 (Biotin)
  • Vitamin B5 (Pantothenic Acid) appears as D-Calcium Pantothenate
  • Choline appears as Choline Bitartrate
  • PABA
  • Inositol appears as Myo-Inositol

Which categories do Thorne L-Arginine Plus and Metagenics Vitamin B-Complex belong to?

  • Amino Acid Formula
  • B-Complex Formula

What health concerns do Thorne L-Arginine Plus and Metagenics Vitamin B-Complex address?

  • Athletic Performance
  • Blood Pressure Support
  • Heart & Cardiovascular Health
  • Men's Health
  • Energy & Metabolism

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

  • Thorne L-Arginine Plus has the highest total amount of Vitamin C: 300 mg per serving

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

  • Thorne L-Arginine Plus has the highest total amount of Vitamin B9 (Folate): 920 mcg DFE per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Thorne L-Arginine Plus: 3 capsules
    • Metagenics Vitamin B-Complex: 1 tablet
  • 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 B9 (Folate)
    • This supplement has 920 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 C
    • This supplement has 125 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin B1 (Thiamin)
    • This supplement has 14 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 16 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.1 mg
    • Tolerable Upper Intake Level: Not established
  • Vitamin B3 (Niacin)
    • This supplement has 200 mg
    • Recommended Dietary Allowance in men: 16 mg
    • Recommended Dietary Allowance in women: 14 mg
    • Tolerable Upper Intake Level: 35 mg
  • Vitamin B6 (Pyridoxine)
    • This supplement has 22 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 665 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

Last updated: February 11, 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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  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team