Member's Mark Vitamin B12 5000 mcg supplement bottle
Member's Mark

Vitamin B12 5000 mcg

What We Researched
1 active ingredient analyzed · 14 inactive ingredients decoded · 3 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
81
Product Score Good
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin B12 5000 mcg 20833%
Bioavailability Fair

Absorption Rating

  • Vitamin B12 Fair
Other Ingredients Excellent

Fillers & Additives

  • Mannitol
  • Microcrystalline Cellulose
  • Crospovidone
  • Stearic Acid
  • Citric Acid
  • Gum Arabic
  • Magnesium Stearate
  • Maltodextrin
  • Methylcobalamin
  • Natural Cherry Flavor
  • Red Beet
  • Silica
  • Sucralose
  • Triacetin
Efficacy Very Good

Dosage Analysis

  • Vitamin B12 5000 mcg High

Supplement Facts

Ingredient Amount % Daily Value
Vitamin B12 5000 mcg 20833%

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.

Crospovidone Generally_safe

It is used as a binder to help tablets or capsules disintegrate.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Citric Acid Safe

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

Gum Arabic Safe

It is used as a thickener, binder, or emulsifier.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Methylcobalamin Safe

It is included as a source of vitamin B12.

Natural Cherry Flavor Safe

It provides a cherry flavor to the product.

Red Beet Unknown
Silica Safe

Prevents ingredients from clumping and improves powder flow.

Sucralose Generally_safe

Adds sweetness to chewables, gummies, and powdered supplements without calories.

Triacetin Generally_safe

It is used as a solvent or humectant.

Price Comparison

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Member's Mark

Founded 1998 · Bentonville, Arkansas, USA · 76 products · samsclub.com/c/members-mark/7230141

Certifications

3 certifications
Consumerlab Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed

Violation History

1 incident
Lawsuit The lawsuit alleges that the product was falsely advertised as containing 500 mg of 'standardized extract' of 'turmeric curcumin complex' with '95% Standardized Turmeric (Curcuma longa) Extract,' implying 475 mg of curcuminoids. However, testing by ConsumerLab.com reportedly found only 9.7 mg of curcuminoids per serving.2023Source
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Frequently Asked Questions
Is Member's Mark Vitamin B12 5000 mcg a good supplement?

Member's Mark Vitamin B12 5000 mcg received a product quality score of 81/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 1 active ingredients with 300 servings per container. Of the 14 inactive ingredients, 8 are rated safe and 0 are flagged for review. The manufacturer, Member's Mark, holds a brand trust score of 66/100 with 3 verified certifications including Consumerlab, Usda Organic, Vegan Certified.

What are the ingredients in Member's Mark Vitamin B12 5000 mcg?

Member's Mark Vitamin B12 5000 mcg contains 1 active ingredients: Vitamin B12 (5000 mcg). Notable high-dose ingredients include Vitamin B12 at 20833% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Member's Mark Vitamin B12 5000 mcg safe to take?

Member's Mark Vitamin B12 5000 mcg 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 Member's Mark a trustworthy supplement brand?

Member's Mark receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1998 and headquartered in Bentonville, Arkansas, USA, the company offers 76 products in their lineup. They hold 3 verified certifications including Consumerlab, Usda Organic, Vegan Certified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Member's Mark has 1 historical regulatory incident on record, which are factored into the trust score.

How much vitamin d3 should i take daily?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What does vitamin d do?

This is an important question for supplement consumers. The dietary supplement industry is largely self-regulated, which means product quality, ingredient transparency, and safety practices vary significantly between brands and products. The most reliable way to evaluate any supplement is to check for third-party testing certifications, review the full ingredient list and dosages, and research the brand's regulatory track record. GoodSupp's database of over 250,000 analyzed products provides independent quality scores, ingredient safety ratings, and brand trust reports to help you make evidence-based decisions.

How much vitamin d3 per day for a woman?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

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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. 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.