BTLabs Case Study: Independent testing reveals severe under-potency in commercial Vitamin Supplement
Overview
A consumer health brand preparing to launch a new Vitamin D3 + K2 supplement on the market approached BTLabs to independently verify the identity and potency of the active ingredients of their formulation. Using industry-standard analytical techniques such as – Infrared Spectroscopy (IR) for identification and HPLC for potency and purity – we demonstrated that the product failed to meet label claims by a wide margin, revealing significant manufacturing issues and potential risks for future consumers.
This anonymized case study demonstrates how BTLabs methods and technology helps our customers protect their reputation, validate suppliers, ensure product quality prior to entering competitive retail markets.
Project Background
The client submitted a full, sealed bottle of vitamin capsules containing a powder described to contain vitamins D3 and K2, as well as additional natural ingredients. The project goal was simple: confirm that the active ingredients matched the manufacturer’s stated potency of approximately 1500 mg and 3500 mg, respectively.With growing concerns about dietary supplement quality on e-commerce platforms, the client wanted independent verification before committing to large-scale production and distribution since vitamins and dietary supplements are not FDA-approved for safety and effectiveness before they are sold, unlike prescription drugs; manufacturers are responsible for ensuring safety and accurate labeling.
Sample Receipt & Chain of Custody
- Samples arrived as a sealed bottle of 60 capsules in dark amber containers, which minimize UV-related decomposition through photo-oxidation.
- Analysts selected random capsules, making sure to perform sample replicates and technical replicates.
- Samples were tested under validated IR and HPLC methods and compared to known standards, under conditions suitable to ensure integrity and reproducibility.
Analytical Methods & Instrumentation
BTLabs used a dual-method approach:
IR Spectroscopy (Prota-3S with ProtaCal™ Software)
Used to confirm identity and detect unexpected components within the sample.
High-Performance Liquid Chromatography (HPLC- Agilent 1200 Series)
Used for potency, purity, and detection of impurities. Methods included:
- Gradient elution with acetonitrile and methanol
- Column C18
- 5 μL injection volume
All analyses were validated using AccuStandard fat-soluble vitamin reference materials, establishing calibration curves and retention-time confirmation for each vitamin.
Results
The analytical data revealed several issues:
Under-Potency
Vitamin D was present – but at less than 60% of the claimed potency, far below both the manufacturer’s COA and acceptable USP tolerances.
Multiple Unknown Impurities
HPLC analysis detected a significant level of non-target components, likely due to poor formulation, weak raw material quality, or inadequate blending.
Low Solubility & Formulation Instability
Observed impurities and inconsistent chromatographic profiles indicated major manufacturing errors, not simple degradation or storage problems.
Scientific Interpretation
The findings strongly suggest:
- Incorrect or inconsistent manufacturing processes
- Mislabeling or an inaccurate COA from the supplier
- Substandard raw materials or improper formulation techniques
BTLabs confirmed results through multiple replicates, ensuring high confidence and reproducibility.
In simple terms, the supplement tested did not contain the vitamin concentration that the label claimed – and therefore failed both efficacy and quality expectations.
Impact for the Customer
For the client, the implications were critical:
- Future consumers purchasing this supplement would not receive the intended dose, potentially compromising health outcomes. (This is incorrect since the product was never sold to any customers)
- The under-potency and impurity profile posed quality and regulatory risks.
- The client used the findings to challenge the current supplier and reevaluate their manufacturing chain before moving forward.
Ultimately, BTLabs’ analysis prevented the client from releasing a defective product into the market – and protected them from possible consumer complaints, refunds, or legal exposure.
Why BTLabs? Our Value Proposition
Rapid Turnaround (2 Weeks, as some standards were needed)
Faster results enable faster decision-making.
Advanced Instrumentation
Prota-3S FT-IR platform and Agilent 1200 HPLC ensure high accuracy and robust sensitivity.
Analysis (We don’t use AI tools in our analysis)
Our ProtaCal software and proprietary algorithms enhance spectral accuracy and impurity detection.
Expertise in analytical chemistry techniques
Independent Third-Party Credibility
Clear Communication & Scientific Guidance
Compliance & Confidentiality
The case study is published anonymously, with product names and brand identifiers removed to maintain client confidentiality. Graphs, spectra, and chromatograms were not included per customer preference.
Conclusion
This case demonstrates how BTLabs helps supplement brands protect their customers and their reputation by providing fast, accurate, and scientifically rigorous testing. Whether evaluating identity, potency, purity, or manufacturing quality, BTLabs delivers the trusted data companies need to navigate today’s demanding vitamins and dietary supplements markets.
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