Shark Tank Weight Loss Gummies claim that they can promote energy, focus and weight loss, but there isn’t any scientific evidence to support these claims,” says Woods. “The safety and efficacy of the use of exogenous ketones in the form of beta-hydroxybutyrate (D-BHB) has not been documented in scientific literature.” While there isn’t much out there in terms of research on specific keto gummies and the different forms and doses of exogenous ketones they contain, there have been a few small studies done on D-BHB supplements in general, and other foods that can increase ketones in the body.