Episode 169: Uncovering THC Potency Variability with Cannabis ChemLab
In this episode, I sit down with Jared Nieuwenhuis, Founder and CEO of Cannabis ChemLab, an ISO/IEC 17025-accredited laboratory serving medical cannabis programs and national USDA hemp growers. Drawing on over 11 years of experience in laboratory development, environmental testing, and commercial farming, Jared brings an authoritative, science-first perspective to the complex world of analytical testing. Jared pulls back the curtain on why cannabis potency test results fluctuate so wildly across the industry. He breaks down groundbreaking internal research from Cannabis ChemLab that tested over 30 different accredited reference standards, demonstrating how slight variations in calibration curves can cause the exact same flower sample to test anywhere from 14% to 25% THC. In addition to potency variability, the conversation tackles heavy metal contamination, exposing why popular ocean-based soil amendments like fishbone meal frequently cause high arsenic fails, how cannabis hyperaccumulates toxins, and how growers can use plant biology to mitigate heavy metal risks in living soil systems.
If you wish to test your inputs/soil/plants for heavy metals, you can purchase tests with Cannabis Chem Lab on our website for $99 by CLICKING HERE.
Episode Notes
This episode covers the key scientific drivers behind lab result variability, from instrument calibration down to field sampling practices.
Understanding Reference Standards: How analytical instruments use commercially available reference standards to construct calibration curves for testing unknown samples.
The Potency Variability Study: Insights from Cannabis ChemLab’s study overlaying 35 different THCA standards, demonstrating how variance between standard manufacturers and product lots leads to drastic differences in reported THC percentages.
The Mechanism of Potency Inflation: How calibration curves at the high end of concentration explain "impossible" lab results exceeding 100% cannabinoids in concentrates and diamonds.
Neutral vs. Acidic Cannabinoids: Why acidic forms like THCA and CBDA present significantly more analytical variability in the lab compared to decarboxylated neutral forms found in edibles.
Heavy Metals and Fertilizer Inputs: An in-depth discussion on ICP-MS heavy metal testing, identifying soil amendments like fishbone meal as a primary source of arsenic accumulation in living soil.
Dispelling Marketing Claims: Why ocean-based inputs are not inherently cleaner than other fertilizers, and why growers must screen raw materials rather than relying on marketing claims.
Agronomic Mitigation Strategies: How plant biology and strategic tissue management, such as utilizing older lower leaves as heavy metal sinks, can help keep heavy metals out of the final flower.
Navigating Unexpected Results: Practical steps for cultivators when faced with surprising lab data, including when a flower batch warrants resampling versus when a process error has occurred.
