A cholesterol drug may be quietly protecting high-risk brains from Alzheimer’s damage.

Other research found that in people with two copies of the APOE4 gene — who face the highest genetic risk for Alzheimer’s — this drug didn’t just slow down a brain damage marker, it actually reversed its rise, while those on a placebo got worse. That’s surprising because most Alzheimer’s biomarkers only climb over time, and seeing one go down is rare. The effect was seen in a blood test, which is less invasive than brain scans, making it easier to track in future studies. But this was only tested in a small group of high-risk individuals, so we don’t yet know if it helps people with one copy of the gene or no copies at all.