Thorne L-Arginine Plus
vs
NOW Foods Vitamin B-12
Supplement Comparison

  • 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
    • 13 nutrients compared
Bar chart: per-serving label amounts and listed forms for Thorne L-Arginine Plus vs NOW Foods Vitamin B-12.

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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 NOW Foods Vitamin B-12 have?

  • Vitamin B9 (Folate) appears as Folic Acid
  • Vitamin B12 (Cobalamin) appears as Cyanocobalamin

Which categories do Thorne L-Arginine Plus and NOW Foods Vitamin B-12 belong to?

  • Amino Acid Formula
  • Single Vitamin

What health concerns do Thorne L-Arginine Plus and NOW Foods Vitamin B-12 address?

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

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
    • NOW Foods Vitamin B-12: 1 lozenge
  • 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 B9 (Folate)
    • This supplement has 667 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 5000 mcg
    • Recommended Dietary Allowance in men: 2.4 mcg
    • Recommended Dietary Allowance in women: 2.4 mcg
    • Tolerable Upper Intake Level: Not established

Last updated: January 29, 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