You’d have to drink 1,000 bottles of red wine to get the amount of the antiaging compound resveratrol that’s used in the latest Alzheimer’s study. Scratch that idea. But it may be worth uncorking a bottle to celebrate the positive findings of the longest and largest human resveratrol study to date.

Researchers gave 119 people with mild-to-moderate Alzheimer’s super-concentrated synthetic resveratrol supplements for a year. It was safe. It got into their brains. It arrested “biomarkers” that indicate the disease is progressing. And there was a modest improvement in the ability to do daily tasks. Next stop on this clinical train—a larger study specifically designed to study effectiveness.

The researchers say it’s too early to recommend supplements yet for Alzheimer’s patients. Certainly anyone being treated for the disease should discuss any supplement with his/her doctor first. But if you want to find out the best ones to try, especially for prevention, here’s the scoop.