NOW Foods Methyl B-12
vs
Douglas Laboratories Liquid B12
Supplement Comparison

  • Vitamin B12 (Cobalamin): NOW Foods Methyl B-12 has 5.0× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 3 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Methyl B-12 vs Douglas Laboratories Liquid B12.

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Frequently asked questions

Which active ingredients does NOW Foods Methyl B-12 have?

  • Vitamin B9 (Folate) appears as Quatrefolic (6S)-5-MTHF Glucosamine Salt
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin

Which active ingredients does Douglas Laboratories Liquid B12 have?

  • Vitamin B12 (Cobalamin) appears as Methylcobalamin

Which categories do NOW Foods Methyl B-12 and Douglas Laboratories Liquid B12 belong to?

  • Single Vitamin

What health concerns do NOW Foods Methyl B-12 and Douglas Laboratories Liquid B12 address?

  • Energy & Metabolism
  • Methylation Support
  • Neurological Support
  • Brain, Focus & Cognitive Function
  • Immune System Support

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

  • NOW Foods Methyl B-12 has the highest total amount of Vitamin B12 (Cobalamin): 5000 mcg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Methyl B-12: 1 lozenge
    • Douglas Laboratories Liquid B12: 1 ml
  • Vitamin B9 (Folate)
    • This supplement has 680 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
  • Vitamin B12 (Cobalamin)
    • This supplement has 1000 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: February 1, 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