Turmeric Forskolin may increase the amount of acid in your stomach. Turmeric Diet Forskolin may cause side effects of nausea, heartburn and indigestion. Such side effects are particularly dangerous for people with pre-existing gastrointestinal health issues, such as a stomach ulcer. Consequently, don't take Turmeric Diet Forskolin supplement if you have a stomach ulcer, the University of Michigan Health System advises.