Get the App
Douglas Laboratories Niatab 500 supplement bottle
Douglas Laboratories

Niatab 500 Review

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 6 brand certifications checked · Page generated: Sep 2026
93
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
Niacin 500 mg 3125%
Bioavailability Excellent

Absorption Rating

  • Niacin Good
Other Ingredients Excellent

Fillers & Additives

  • Ethylcellulose
  • Stearic Acid
  • Vegetable Stearate
  • Silica
Efficacy Very Good

Dosage Analysis

  • Niacin 500 mg High

Supplement Facts

Ingredient Amount % Daily Value
Niacin 500 mg 3125%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Ethylcellulose Generally_safe

It is used as a coating to control the release of supplement ingredients.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Vegetable Stearate Safe

Prevents ingredients from sticking to equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

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
Related Supplements
Tru Niagen Tru Niagen Pro 1000 mg
Tru Niagen Tru Niagen Pro 1000 mg
Product 100 Brand 100
Jamieson Extra Strength D3 2500 IU
Jamieson Extra Strength D3 2500 IU
Product 100 Brand 100
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Product 100 Brand 100
Douglas Laboratories L-Methionine
Douglas Laboratories L-Methionine
Product 100 Brand 100
Douglas Laboratories L-Methionine
Douglas Laboratories L-Methionine
Product 100 Brand 100
Douglas Laboratories Bilberry Max-V
Douglas Laboratories Bilberry Max-V
Product 100 Brand 100
Frequently Asked Questions
Is Douglas Laboratories Niatab 500 a good supplement?

Douglas Laboratories Niatab 500 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 with 100 servings per container. All 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Douglas Laboratories, holds a brand trust score of 100/100.

What are the ingredients in Douglas Laboratories Niatab 500?

Douglas Laboratories Niatab 500 contains 1 active ingredients: Niacin (500 mg). Notable high-dose ingredients include Niacin at 3125% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Douglas Laboratories Niatab 500 safe to take?

GoodSupp reviewed the inactive-ingredient data available for Douglas Laboratories Niatab 500. All 4 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. 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.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Download on App Store Browse All Supplements
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.