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Douglas Laboratories Methyl B12 Plus supplement bottle
Douglas Laboratories

Methyl B12 Plus Review

What We Researched
2 active ingredients analyzed · 5 inactive ingredients decoded · 6 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
100
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Folate (as L-methylfolate, Metafolin®) 400 mcg 100%
Vitamin B12 (as methylcobalamin) 1000 mcg 16,667%
Bioavailability Excellent

Absorption Rating

  • Folate (as L-methylfolate, Metafolin®) Good
  • Vitamin B12 (as methylcobalamin) Good
Other Ingredients Excellent

Fillers & Additives

  • Xylitol
  • Mannitol
  • Natural black cherry and vanilla flavor
  • Carboxymethylcellulose
  • Ascorbyl Palmitate
Efficacy Excellent

Dosage Analysis

  • Folate (as L-methylfolate, Metafolin®) 400 mcg Effective
  • Vitamin B12 (as methylcobalamin) 1000 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Folate (as L-methylfolate, Metafolin®) 400 mcg 100%
Vitamin B12 (as methylcobalamin) 1000 mcg 16,667%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Xylitol Safe

Provides sweetness with reduced calorie content. Does not promote tooth decay.

Mannitol Generally_safe

It is used as a sweetener, filler, and flow agent.

Natural black cherry and vanilla flavor Unknown
Carboxymethylcellulose Unknown
Ascorbyl Palmitate Safe

Prevents oxidation and extends shelf life of oil-based supplements.

Brand Trust Report
Douglas Laboratories

Founded 1955 · Pittsburgh, Pennsylvania, United States · 32 products · douglaslabs.com

Certifications

6 certifications
Consumerlab Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
Nsf Certified For Sport Source available Primary evidence
Nsf Gmp Source available Primary evidence
Usda Organic Source available Primary evidence
NSF Certified Supporting evidence unavailable

Transparency

5 claims
Third Party Testing Claim — Verified Evidence available Evidence
Coa Availability — Verified Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable

Violation History

2 incidents
Recall Douglas Labs Stress-B-Plus2024-10-07 Source available Primary source
Prop 65 Lead2008-10-22 Source available Primary source
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Frequently Asked Questions
Is Douglas Laboratories Methyl B12 Plus a good supplement?

Douglas Laboratories Methyl B12 Plus received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients with 90 servings per container. Of the 5 inactive ingredients, 3 are rated safe and 0 ingredients are flagged for review. The manufacturer, Douglas Laboratories, holds a brand trust score of 100/100.

What are the ingredients in Douglas Laboratories Methyl B12 Plus?

Douglas Laboratories Methyl B12 Plus contains 2 active ingredients: Folate (as L-methylfolate, Metafolin®) (400 mcg), Vitamin B12 (as methylcobalamin) (1000 mcg). Notable high-dose ingredients include Vitamin B12 at 16,667% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Douglas Laboratories Methyl B12 Plus safe to take?

GoodSupp reviewed the inactive-ingredient data available for Douglas Laboratories Methyl B12 Plus. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Douglas Laboratories a trustworthy supplement brand?

Douglas Laboratories receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1955 and headquartered in Pittsburgh, Pennsylvania, United States, the company offers 32 products in their lineup. Note: Douglas Laboratories has 2 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.