CBD and its two major metabolites (7-OH-CBD and 7-COOH-CBD) dose-dependently reduced human neural stem cell viability, with longer exposures at blood-level concentrations causing cell death and altered differentiation, raising concerns about fetal brain development.
Neurodevelopmental researchers, clinicians counseling pregnant women about CBD, and regulators considering CBD safety labeling.
CBD metabolites caused cell death at concentrations found in human blood
What the researchers found
CBD, 7-OH-CBD, and 7-COOH-CBD all dose-dependently reduced NSC viability. CBD and 7-OH-CBD reduced cells at G1 phase. At clinically relevant blood concentrations, longer exposures caused more obvious cell death. After differentiation, CBD reduced GFAP and CB2 receptor expression. THC also reduced GFAP but not CB2. CB1 and beta-tubulin III expression were unaffected.
Why it matters
CBD is increasingly used by pregnant women who perceive it as safe. This study shows that CBD and its metabolites, at concentrations actually found in human blood, affect neural stem cells in ways relevant to fetal brain development.
The numbers in context
Three compounds tested (CBD, 7-OH-CBD, 7-COOH-CBD). All dose-dependently reduced viability. Longer exposures at blood-level concentrations caused more cell death. GFAP and CB2 expression reduced after CBD-treated differentiation.
How the study worked
Human neural stem cells treated with CBD, 7-OH-CBD, 7-COOH-CBD, and THC at various concentrations and durations. Cell viability, proliferation, cell cycle, and differentiation markers (GFAP, CB1, CB2, beta-tubulin III) assessed.
What this study cannot tell us
In vitro study with isolated stem cells, not intact brain tissue. Cannot replicate the complex fetal environment. Single cell line. Concentrations and durations are approximations of in vivo exposure.
How to read the evidence
Human neural stem cell model with clinically relevant concentrations, but in vitro limitations prevent direct clinical conclusions.
When this study was published
2025 study using human neural stem cells to model fetal CBD exposure effects.
The bigger picture
This is one of the first studies to examine CBD metabolites (not just CBD itself) on human neural cells. Since metabolites persist longer than the parent compound, their effects may be more clinically relevant than CBD alone.
Questions still open
- Do these in vitro effects translate to neurodevelopmental consequences in vivo?
- Should CBD products carry warnings about pregnancy use?
Common questions
Is CBD safe during pregnancy?
Are CBD metabolites harmful?
Read the original research
The effects of cannabidiol and its main metabolites on human neural stem cells.
Experimental biology and medicine (Maywood, N.J.), 250, 10608
Citation
Latham, Leah E; Gu, Qiang; Liu, Shuliang; Wang, Cheng; Liu, Fang. (2025). The effects of cannabidiol and its main metabolites on human neural stem cells.. Experimental biology and medicine (Maywood, N.J.), 250, 10608. https://doi.org/10.3389/ebm.2025.10608
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