Assessing Cannabis Potency: Are Labels Accurate?

Recent research highlights significant disparities in how cannabis products are labeled regarding their THC content, especially in flower products. A comprehensive study conducted in Colorado, the first state to legalize recreational marijuana, revealed that nearly half of the cannabis flowers tested contained more THC than the labels indicated, raising concerns about both medical dosing and recreational safety. In contrast, cannabis concentrates like oils and waxes showed a high accuracy rate, with about 96% matching their labeled THC levels.

The study involved 277 products collected from 52 dispensaries across 19 counties, including loose flowers, pre-rolled joints, and various concentrates such as shatter, hash, and wax. Laboratory testing showed that flower products had an average THC content of approximately 21%, while concentrates averaged around 71%, with some as high as 84%. Back in the 1980s, typical THC levels in marijuana were around 8%, indicating a significant increase over the decades.

When evaluating label accuracy based on the standard of within 15% of the stated THC amount, about 44% of flower products were inaccurately labeled. Some products overstated THC content, while others contained less than indicated, leading to potential risks. For consumers using cannabis for medical purposes, mislabeling can impact proper dosing, and recreational users might inadvertently consume higher doses than expected, increasing potential health risks.

The study also examined other cannabinoids such as CBD, CBG, and CBGA, proposing that labeling should not only focus on THC but also include information on these other compounds. These lesser-known cannabinoids have properties that may be beneficial, such as anti-inflammatory or anti-anxiety effects, which are currently underreported.

The researchers emphasize the need for improving testing protocols and transparency in labeling to create trust and safety within the industry. As legislation expands to include more states and products like edibles, ensuring accurate labels will be critical for consumer safety and informed choices.

This study underscores the importance of rigorous testing and honest labeling in the evolving cannabis industry, aiming to help regulators, businesses, and consumers make better-informed decisions.

Source: https://medicalxpress.com/news/2025-07-strong-weed-misrepresent-potency.html