Low-dose CBD hemp extract improved HDL cholesterol but had limited other effects
In a 6-week RCT, 15mg daily CBD from hemp extract significantly improved HDL cholesterol and showed trends toward better sleep, stress response, and life pleasure in overweight adults.
Quick Facts
What This Study Found
Among 65 overweight but healthy adults, 60mg/day hemp extract (containing 15mg CBD) significantly improved HDL cholesterol (p=0.004, ES=0.75). Statistical trends favored hemp for "pleasure from life" (p=0.06, ES=0.48) and "ability to cope with stress" (p=0.07, ES=0.46). Within-group improvements in sleep quality (p=0.005) and quantity (p=0.01) were observed. All safety markers remained normal.
Key Numbers
65 participants; 6 weeks; HDL improvement p=0.004, ES=0.75; sleep quality within-group p=0.005, ES=0.54; all safety markers within normal limits.
How They Did This
Randomized, double-blind, placebo-controlled trial with 65 overweight adults (BMI ~28.5) taking 60mg/day hemp extract (15mg CBD) or placebo for 6 weeks, measuring stress resilience, psychometrics, HRV, body composition, and clinical biomarkers.
Why This Research Matters
This is one of the few placebo-controlled trials testing commercially available CBD hemp products at typical consumer doses. The HDL finding is novel and unexpected.
The Bigger Picture
Most CBD research uses pharmaceutical-grade products at much higher doses. This study suggests even low-dose commercial hemp extract may have some measurable effects, though most outcomes did not reach statistical significance.
What This Study Doesn't Tell Us
Relatively small sample; 6-week duration; only 15mg CBD per day (much lower than most clinical studies); hemp extract contains other compounds beyond CBD; most primary outcomes were not statistically significant.
Questions This Raises
- ?Is the HDL improvement replicable at low CBD doses?
- ?Would higher doses produce stronger effects on sleep and stress?
Trust & Context
- Key Stat:
- HDL cholesterol significantly improved (p=0.004, effect size 0.75)
- Evidence Grade:
- Moderate: proper RCT design, but small sample and most primary outcomes not statistically significant.
- Study Age:
- Published 2020.
- Original Title:
- Effects of Hemp Extract on Markers of Wellness, Stress Resilience, Recovery and Clinical Biomarkers of Safety in Overweight, But Otherwise Healthy Subjects.
- Published In:
- Journal of dietary supplements, 17(5), 561-586 (2020)
- Authors:
- Lopez, Hector L, Cesareo, Kyle R, Raub, Betsy, Kedia, A William, Sandrock, Jennifer E, Kerksick, Chad M, Ziegenfuss, Tim N
- Database ID:
- RTHC-02693
Evidence Hierarchy
Participants are randomly assigned to treatment or placebo groups to test cause and effect.
What do these levels mean? →Frequently Asked Questions
Did low-dose CBD improve health markers?
HDL ("good") cholesterol significantly improved. Sleep quality and stress coping showed trends toward improvement but did not reach full statistical significance.
Is 15mg of CBD per day enough to produce effects?
This study found a significant HDL effect at this dose, but most measured outcomes did not reach statistical significance. Most clinical studies use much higher doses (150-1500mg).
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Cite This Study
https://rethinkthc.com/research/RTHC-02693APA
Lopez, Hector L; Cesareo, Kyle R; Raub, Betsy; Kedia, A William; Sandrock, Jennifer E; Kerksick, Chad M; Ziegenfuss, Tim N. (2020). Effects of Hemp Extract on Markers of Wellness, Stress Resilience, Recovery and Clinical Biomarkers of Safety in Overweight, But Otherwise Healthy Subjects.. Journal of dietary supplements, 17(5), 561-586. https://doi.org/10.1080/19390211.2020.1765941
MLA
Lopez, Hector L, et al. "Effects of Hemp Extract on Markers of Wellness, Stress Resilience, Recovery and Clinical Biomarkers of Safety in Overweight, But Otherwise Healthy Subjects.." Journal of dietary supplements, 2020. https://doi.org/10.1080/19390211.2020.1765941
RethinkTHC
RethinkTHC Research Database. "Effects of Hemp Extract on Markers of Wellness, Stress Resil..." RTHC-02693. Retrieved from https://rethinkthc.com/research/lopez-2020-effects-of-hemp-extract
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.