NOW Foods Methyl B-12
vs
Doctor's Best Fully Active B Complex
Supplement Comparison

  • Vitamin B12 (Cobalamin): NOW Foods Methyl B-12 has 5.0× more
  • Vitamin B9 (Folate): NOW Foods Methyl B-12 has 70% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 16 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Methyl B-12 vs Doctor's Best Fully Active B Complex.

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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 Doctor's Best Fully Active B Complex have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B1 (Thiamin) appears as Thiamin HCl
  • Vitamin B2 (Riboflavin) appears as Riboflavin and Riboflavin 5-Phosphate
  • Vitamin B3 (Niacin) appears as Niacinamide and Niacin
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl and Pyridoxal 5-Phosphate
  • Vitamin B9 (Folate) appears as Quatrefolic (6S)-5-MTHF Glucosamine Salt
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • Vitamin B7 (Biotin) appears as D-Biotin
  • Vitamin B5 (Pantothenic Acid) appears as D-Calcium Pantothenate

Which categories do NOW Foods Methyl B-12 and Doctor's Best Fully Active B Complex belong to?

  • Single Vitamin
  • B-Complex Formula

What health concerns do NOW Foods Methyl B-12 and Doctor's Best Fully Active B Complex address?

  • Energy & Metabolism
  • Methylation Support
  • Neurological Support
  • Cellular Health

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

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

  • NOW Foods Methyl B-12 has the highest total amount of Vitamin B9 (Folate): 680 mcg DFE per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Methyl B-12: 1 lozenge
    • Doctor's Best Fully Active B Complex: 1 capsule
  • 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 C
    • This supplement has 40 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 60 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 75 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 50 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 50 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 400 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 13, 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