Because they haven’t been studied in humans, there is no data about potential side effects.

However, as a food additive, raspberry ketones are categorized as “Generally Recognized as Safe” (GRAS) by the FDA.

Keep in mind that the FDA also puts high fructose corn syrup and soybean oil in the same category, so take that with a big grain of salt.

The mouse and rat studies used massive dosages and no harmful effects were noted, therefore it appears there are no side effects to the use of raspberry ketones.

Keeping with in the recommended amounts will ensure there are no side effects

Bottom Line: In a nut shell, there are no known side effects from using raspberry ketone supplements.