Yes in some people liver damage has occurred after taking Garcinia Cambogia without any other medicine so it would be the Garcinia Cambogia that caused liver damage in the person.
Although liver damage from Garcinia Cambogia is rare but it can and does happen.
Garcinia Cambogia can also interact with any other diabetic treatments because it can lower a persons blood sugar levels.
Also Garcinia Cambogia has other side affects such as dizziness, Upset Stomach, Diarrhea, Dry Mouth and headaches.