Evidence on whether recreational cannabis use affects bone mineral density is sparse and conflicting, with only four eligible studies found.
Clinicians treating osteoporosis, cannabis users concerned about bone health, and researchers identifying gaps in the literature.
Only 4 of 2,620 screened studies met inclusion criteria, with conflicting results
What the researchers found
Of four included studies (3 cross-sectional, 1 RCT) covering 4,032 participants, two found that cannabis exposure decreased bone mineral density while two found no effect.
Why it matters
As recreational cannabis use rises globally, understanding its effects on bone health is important, especially for aging populations at risk of osteoporosis.
The numbers in context
2,620 studies screened, 4 included (3 cross-sectional, 1 RCT). Total participants: 4,032 aged 18-60. Two studies showed decreased BMD; two showed no change.
How the study worked
Systematic review searching MEDLINE, EMBASE, Cochrane Library, and Web of Science through March 2023 for studies on recreational cannabis use and bone mineral density in adults aged 18-60. From 2,620 studies screened, four met inclusion criteria.
What this study cannot tell us
Only four studies met criteria, making definitive conclusions impossible. Differences in cannabis products, doses, and exposure assessment prevent meaningful comparison. No longitudinal studies were found.
How to read the evidence
Extremely limited evidence base with only four heterogeneous studies and no longitudinal data.
When this study was published
Published in 2024 with literature searched through March 2023.
The bigger picture
Animal studies have established that cannabinoids play a role in bone metabolism, but the clinical picture remains unclear. The gap between preclinical evidence and human data needs to be closed.
Questions still open
- Does long-term heavy cannabis use accelerate bone loss in older adults?
- Do different cannabinoids (THC vs. CBD) have opposing effects on bone density?
Common questions
Does cannabis weaken your bones?
Should older cannabis users worry about bone health?
Read the original research
Effect of recreational cannabis use on bone mineral density: a systematic review.
Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, 35(3), 391-399
Citation
Magno, Luiz Alexandre Viana; Tameirão, Diego Ribeiro; Alves, Lucas Ferreira; Guimarães, Nathalia Sernizon. (2024). Effect of recreational cannabis use on bone mineral density: a systematic review.. Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, 35(3), 391-399. https://doi.org/10.1007/s00198-023-06992-4
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