Source Naturals B-12 Fast Melt 5 mg supplement bottle
Source Naturals

B-12 Fast Melt 5 mg Review

What We Researched
1 active ingredient analyzed · 9 inactive ingredients decoded · 2 brand certifications checked · Last updated: Aug 2026
93
Product Score Excellent
75
Brand Score Fair

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
Vitamin B12 (as Methylcobalamin) 5 mg 208333%
Bioavailability Excellent

Absorption Rating

  • Vitamin B12 (as Methylcobalamin) Good
Other Ingredients Excellent

Fillers & Additives

  • Mannitol
  • Microcrystalline Cellulose
  • Hydroxypropyl Cellulose
  • Modified Cellulose Gum
  • Natural Black Cherry flavor
  • Natural Peach Flavor
  • Magnesium Stearate
  • Citric Acid
  • Stevia Extract
Efficacy Very Good

Dosage Analysis

  • Vitamin B12 (as Methylcobalamin) 5 mg High

Supplement Facts

Ingredient Amount % Daily Value
Vitamin B12 (as Methylcobalamin) 5 mg 208333%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Mannitol Generally_safe

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

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Modified Cellulose Gum Generally_safe

It is used to improve the texture and stability of products.

Natural Black Cherry flavor Unknown
Natural Peach Flavor Safe

It is used to add peach flavor to the supplement.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Citric Acid Safe

Adds tartness and acts as a natural preservative. Also aids in ingredient stability.

Stevia Extract Generally_safe

It is used to add sweetness without calories.

Brand Trust Report
Source Naturals

Founded 1982 · Scotts Valley, CA, USA · 1511 products · sourcenaturals.com/

Certifications

2 certifications
Fda Gmp Inspections Verified Source
Non-GMO Project Verified Verified

Transparency

3 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source
Contains Proprietary Blend — True
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Frequently Asked Questions
Is Source Naturals B-12 Fast Melt 5 mg a good supplement?

Source Naturals B-12 Fast Melt 5 mg received a product quality score of 93/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients Of the 9 inactive ingredients, 5 are rated safe and 0 are flagged for review. The manufacturer, Source Naturals, holds a brand trust score of 75/100 with 2 verified certifications including Fda Gmp Inspections, Non-GMO Project Verified.

What are the ingredients in Source Naturals B-12 Fast Melt 5 mg?

Source Naturals B-12 Fast Melt 5 mg contains 1 active ingredients: Vitamin B12 (as Methylcobalamin) (5 mg). Notable high-dose ingredients include Vitamin B12 at 208333% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals B-12 Fast Melt 5 mg safe to take?

Source Naturals B-12 Fast Melt 5 mg has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Source Naturals a trustworthy supplement brand?

Source Naturals receives a brand trust score of 75/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1982 and headquartered in Scotts Valley, CA, USA, the company offers 1511 products in their lineup. They hold 2 verified certifications including Fda Gmp Inspections, Non-GMO Project Verified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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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.