Taking statins may lower bad cholesterol and affect cholesterol levels in the brain for people with dementia, which could mean it’s working in both the body and the brain.

What we've found so far is that the evidence leans toward statins affecting cholesterol levels in both the blood and the brain in people with dementia. Our analysis of the available research shows this effect may involve lowering bad cholesterol in the body while also influencing cholesterol in the brain [1]. We reviewed 33.0 assertions that support this idea, and none that refute it. The evidence we've analyzed suggests statins may be active in both the body and the brain for people with dementia, potentially altering cholesterol in both places [1]. Cholesterol in the brain is different from cholesterol in the blood, and the brain manages it separately. Still, the data we’ve looked at indicate that statins might reach the brain and have some impact there, not just in the bloodstream. We want to be clear: this is what we’ve found so far, based on the evidence we’ve reviewed. We are not saying statins definitely improve dementia symptoms or change brain function — only that they may affect cholesterol levels in both the blood and brain. The exact meaning of this change is still not fully understood. Because the brain regulates cholesterol on its own, it’s not automatic that a drug affecting blood cholesterol would also affect brain cholesterol. But the current evidence we’ve analyzed leans toward statins doing both in people with dementia [1]. Practical takeaway: If you’re taking statins for heart health and have dementia, the medication might be influencing cholesterol in your brain as well as your blood — but what that means for your overall brain health is still unclear based on what we know today.