Vitamin D: Potency Verification Test

Testing Overview

We sent samples to an accredited third-party laboratory for independent testing. All products were purchased anonymously from retail channels to ensure authentic consumer experience.

Testing Methodology

• Laboratory: ISO 17025 accredited facility
• Sample Size: 3 units per product from different batches
• Testing Standards: USP, FDA, and EU guidelines
• Analysis Methods: ICP-MS, HPLC, and spectrophotometry

Key Findings

The majority of products tested met safety standards and label claims. However, several products showed significant discrepancies that consumers should be aware of.

Products That Passed

• Product A - Met all safety and potency standards
• Product B - Exceeded label claims by 5% (acceptable variance)
• Product C - Met all standards with excellent purity

Products With Concerns

• Product X - Below label claims by 15%
• Product Y - Trace contaminants detected (within legal limits)
• Product Z - Significant batch-to-batch variation

What This Means for Consumers

While most products are safe and effective, quality varies significantly between brands. We recommend choosing products from manufacturers with transparent testing practices and consistent quality control.

Full Test Results

Detailed test results including specific measurements, batch numbers, and laboratory certificates are available to our members. This ensures transparency while protecting proprietary testing methods.