What the Reported CBD Food-Effect Multiples Represented

forensic toxicology working group members October 31, 2026 Forensic Toxicology

The published CBD food-effect multiples were modeled ratios of geometric least-squares means. They did not mean that every participant’s concentration rose by the same multiple after a meal.

The analysis compared relative exposure

Healthy adults received a single 750 mg dose of a pharmaceutical CBD oral solution under assigned fasting, meal or drink conditions. Plasma sampling continued for up to ninety-six hours.

For exposure measures such as area under the concentration–time curve and peak concentration, the investigators used log-transformed data in a mixed-effects analysis. They reported test-to-reference ratios of geometric least-squares means with 90% confidence intervals.

A group ratio is not an individual prediction

The high-fat, high-calorie comparison produced approximately 3.8-fold greater area under the curve to infinity and 5.2-fold greater peak CBD concentration than fasting. These are different endpoints derived from a group analysis, not universal multipliers for every person.

The confidence intervals concern uncertainty in the estimated relative exposure. They are not prediction intervals specifying where every new patient’s result will fall. The authors reported moderate to high between- and within-person variability, and the exploratory trial had no prospective power calculation.

What the numbers cannot supply

A ratio of plasma exposures does not establish a matching ratio of pain relief, seizure benefit or impairment. It also cannot reliably reconstruct an individual’s dose from one sample without the relevant formulation, food history and timing. The sponsor-supported study tested a particular high-dose oral solution in healthy adults rather than every retail CBD product.

Related analysis: the CBD meal and drink exposure findings.