Life Extension Vitamin B12 Methylcobalamin
vs
Douglas Laboratories B-Complex
Supplement Comparison

  • Vitamin B12 (Cobalamin): Life Extension Vitamin B12 Methylcobalamin has 25% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 15 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Vitamin B12 Methylcobalamin vs Douglas Laboratories B-Complex.

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Frequently asked questions

Which active ingredients does Life Extension Vitamin B12 Methylcobalamin have?

  • Vitamin B12 (Cobalamin) appears as Methylcobalamin

Which active ingredients does Douglas Laboratories B-Complex have?

  • Vitamin B1 (Thiamin) appears as Thiamin HCl
  • Vitamin B2 (Riboflavin) appears as Riboflavin and Riboflavin 5-Phosphate (60% R5P)
  • Vitamin B3 (Niacin) appears as Niacinamide and Inositol Hexanicotinate
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl and Pyridoxal 5-Phosphate (40% P5P)
  • Vitamin B9 (Folate) appears as Metafolin L-5-MTHF
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • Vitamin B7 (Biotin) appears as D-Biotin
  • Vitamin B5 (Pantothenic Acid) appears as Calcium Pantothenate

Which categories do Life Extension Vitamin B12 Methylcobalamin and Douglas Laboratories B-Complex belong to?

  • Single Vitamin
  • B-Complex Formula

What health concerns do Life Extension Vitamin B12 Methylcobalamin and Douglas Laboratories B-Complex address?

  • General Health
  • Heart & Cardiovascular Health
  • Neurological Support
  • Brain, Focus & Cognitive Function
  • Energy & Metabolism
  • Methylation Support

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

  • Life Extension Vitamin B12 Methylcobalamin has the highest total amount of Vitamin B12 (Cobalamin): 500 mcg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Vitamin B12 Methylcobalamin: 1 lozenge
    • Douglas Laboratories B-Complex: 1 capsule
  • Vitamin B12 (Cobalamin)
    • This supplement has 500 mcg
    • Recommended Dietary Allowance in men: 2.4 mcg
    • Recommended Dietary Allowance in women: 2.4 mcg
    • Tolerable Upper Intake Level: Not established
  • Vitamin B1 (Thiamin)
    • This supplement has 100 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 12.7 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 108 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 16.7 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 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 400 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 31, 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).
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  • 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