Side Effects Unknown
Raspberry ketones in food and cosmetics are generally considered safe. But no one knows what short- or long-term effect raspberry ketone supplements could have on your overall health. No study has been done to document potential side effects. There are also no studies that look at potential drug or food interactions.
The fact that raspberry ketones chemically resemble other stimulants suggests the potential for certain side effects. And there are anecdotal reports of jitteriness, increased blood pressure, and rapid heartbeat among people taking raspberry ketone supplements. Without scientific evidence, no one can say what dosage of raspberry ketone supplements, if any, might be safe to take.
Talk to your doctor about any supplements you're thinking about taking, and any concerns you have about your weight or weight loss.