The CBD stress experiment summarized cortisol as an immediate change from baseline, while anxiety and negative self-statements were summarized across several observations. These endpoints did not measure the same response window.
What was calculated
People at clinical high risk of psychosis received 600 mg CBD daily or placebo before a social stress challenge on day eight. Researchers measured serum cortisol before the challenge and immediately, ten minutes and twenty minutes afterward. The cortisol analysis used the immediate post-challenge value minus baseline.
For state anxiety and negative self-statements, the authors calculated area under the curve with respect to ground across the four time points. That summary incorporates levels throughout the observation period rather than only an immediate change.
Why the distinction matters
An immediate difference and an integrated score can respond differently to a high baseline, brief peak or prolonged recovery. A larger anxiety area does not establish a larger cortisol increase. Nor does one cortisol contrast reconstruct every part of the hormone time course. The biological and self-report measurements should retain their original definitions.
The treatment contrast remained uncertain
The direct CBD-placebo comparisons did not demonstrate significant benefit for cortisol reactivity or anxiety. Different endpoint definitions do not explain away those null findings. They specify what was tested. This short, small human experiment also did not measure whether CBD prevented later psychosis or improved everyday functioning.
Related reading: CBD public-speaking research.
Research cited
Appiah-Kusi and colleagues (2020). Effects of short-term cannabidiol treatment on response to social stress in subjects at clinical high risk of developing psychosis. DOI: 10.1007/s00213-019-05442-6.
Leave a Reply