Dr. Andrija Karačić is a medical doctor specializing in abdominal surgery, with a growing academic and clinical focus on the human gut microbiome. He earned his medical degree (MD) from the University of Zagreb in 2017, followed by internships in Switzerland and at KB Sveti Duh in Zagreb. Early in his career, he gained experience working in emergency medicine departments across Zagorje and Lika, which provided him with a solid foundation in acute care and diagnostics.

Driven by personal experience and a growing scientific curiosity, Dr. Karačić developed a strong interest in the gut microbiome during his surgical specialization. This interest intensified during the COVID-19 pandemic, when he dedicated significant time to reviewing international scientific literature and conducting informal microbiome analyses within his community.

In 2021, he enrolled in a doctoral program in Biotechnical Sciences at the Faculty of Food Technology and Biotechnology, University of Zagreb, where he continues to develop his research expertise. The following year, he founded the Center for Gut Microbiome Research, with the mission of advancing both scientific understanding and practical clinical application of microbiome diagnostics.

Dr. Karačić has independently designed and led multiple scientific projects and has co-authored several international peer-reviewed publications. His work bridges surgery, microbiology, and personalized medicine.

On the LittleDot platform, Dr. Karačić provides interpretation of gut microbiome test results, offers science-based personalized recommendations, and supports users through written consultations to help them improve their digestive health.