Written based on 21 research studies on PubMed, searched on 11 Nov 2026.
The claim
Posts online say that CBD (cannabidiol) helps with Alzheimer disease.
Where research stands
We found 81 published papers on CBD (cannabidiol) and Alzheimer disease. They were published between 1993 and 2026. 1 of them is a study in people. 1 of them compared people who got it with a group that did not. 45 were studies in animals, and 4 were only in cells in the lab. 20 papers are reviews that sum up other studies. 3 new studies in people are running or will start soon, say the trial registers. 3 research projects on CBD (cannabidiol) for Alzheimer disease are funded and still running.
- 1In people1 with a comparison group
- 45In animals
- 4Only in the lab
What the studies found
We have not summed up these studies in words yet. The most important papers are listed under Sources.
Verdict
CBD (cannabidiol) has been tested in randomised trials in people with Alzheimer disease.
What this means for you: A study in people is not proof that it helps you. Do not stop or change your medicines because of it. Ask your doctor before you start taking it.
Sources
- Cannabidiol for behavior symptoms in Alzheimer's disease (CANBiS-AD): a randomized, double-blind, placebo-controlled trial.2024 · Int Psychogeriatr · Randomised trial
- Cannabidiol in Alzheimer's disease: evidence-weighted molecular mechanisms and translational challenges.2026 · Mol Biol Rep · Review
- Therapeutic Potential for Cannabidiol on Alzheimer's Disease-Related Neuroinflammation: A Systematic Review and Meta-Analysis.2025 · Int J Mol Sci · Review
- Cannabidiol and Alzheimer Disease: A Comprehensive Review and In Silico Insights Into Molecular Interactions.2025 · Eur J Neurosci · Review
- A systematic study of molecular targets of cannabidiol in Alzheimer's disease.2024 · J Alzheimers Dis Rep · Review
- Cannabidiol and Alzheimer's disease.2024 · Int Rev Neurobiol · Review
- Modulation of Oxidative Stress and Neuroinflammation by Cannabidiol (CBD): Promising Targets for the Treatment of Alzheimer's Disease.2024 · Curr Issues Mol Biol · Review
- Cannabidiol Regulates Amyloid-β Plaque Deposition and Astrogliosis in the 5xFAD Transgenic Mouse Model.2026 · J Mol Neurosci · In animals
- Design, Synthesis, In Silico and In Vitro Pharmacological Profiling of Cannabidiol-like Synthetic Analogues as Multi-Target Anti-Alzheimer's Agents.2026 · Molecules · In animals
- RGD-functionalized cannabidiol lipid nanoparticles improve brain delivery and alleviate cognitive and metabolic dysfunction via gut-brain axis modulation in an Alzheimer's disease model.2026 · Biomed Pharmacother · In animals
- Cannabidiol attenuates tau hyperphosphorylation and cognitive deficits in an experimental model of Alzheimer's disease and is associated with restoration of PP2A expression.2026 · Metab Brain Dis · In animals
- Combining cannabidiol and delta-9-tetrahydrocannabinol at a 50:3 ratio - a new therapeutic strategy for APPSwe/PS1ΔE9 transgenic mice?2026 · Neurobiol Aging · In animals
- Cannabidiol and pBDNF Cotreatment Attenuates Pathological Symptoms and Improves Cognition in 3 month-Old 5XFAD Mice.2026 · ACS Chem Neurosci · In animals
- Cannabidiol Alleviates Aβ1-42-Induced Cognitive Deficits and Neuronal Injury Associated with Modulation of the AEA-FAAH-CB1R Axis and BDNF/TrkB Signaling.2026 · Biomolecules · In the lab
- Effects of cannabidiol interactions with Wnt/β-catenin pathway and PPARγ on oxidative stress and neuroinflammation in Alzheimer's disease.2017 · Acta Biochim Biophys Sin (Shanghai) · In the lab
- Cannabidiol Modulates the Expression of Alzheimer's Disease-Related Genes in Mesenchymal Stem Cells.2016 · Int J Mol Sci · In the lab
- Cannabidiol promotes amyloid precursor protein ubiquitination and reduction of beta amyloid expression in SHSY5YAPP+ cells through PPARγ involvement.2014 · Phytother Res · In the lab
- Correction: Mechanistic insights into cannabidiol-mediated TrkB activation via FRS2 interaction in attenuating Alzheimer's disease pathology and cognitive impairment.2026 · Mol Psychiatry · Other paper
- Cannabis and Cannabidiol, GLP-1 Receptors, and Autophagy: The Burgeoning Link Between Cognitive Neurodegeneration With Alzheimer's Disease and Metabolic Disorders.2026 · Discov Med · Other paper
- Exploring multitarget molecular mechanisms of cannabidiol in Alzheimer's disease treatment using molecular simulations and modeling.2025 · J Alzheimers Dis · Other paper
- Cannabis and Cannabidiol: Pioneering Treatment for the Nervous System with Alzheimer's Disease and Peripheral Organ Involvement with Nonalcoholic Fatty Liver Disease (NAFLD).2025 · Curr Neurovasc Res · Other paper
