Grounded in science. Guided by experts.
G-Loop™ was developed in partnership with global leaders in GLP-1 biology, metabolic nutrition, and veterinary science, translating breakthrough human research into proactive pet wellness.
Meet the scientific minds behind G-Loop™
From early formulation to ongoing studies, G-Loop™ is shaped by a world-class team of researchers and advisors. Their insights guide every ingredient, formula, and benefit, ensuring it's grounded in evidence and built for real-world results.
Dr. Thais Cesar, PhD
Clinical Nutrition Researcher | São Paulo State University (UNESP)
A pioneer in metabolic nutrition and blood sugar regulation, Dr. Cesar has spent over 30 years studying citrus flavonoids and their impact on chronic disease. Her clinical trials on ERIOMIN® — including results showing a 15–22% increase in GLP-1 and reductions in inflammation — directly shaped the foundation of G-Loop™.
Dr. Thais lives in Florida with her wonderful mixed-breed dog, Nina.
Dr. Dragan Milenkovic, PhD
Associate professor, North Carolina State University | Plants for Human Health Institute | Nutrigenomics, Bioactives and Health lab | College of Agriculture and Life Sciences
An internationally recognized expert in polyphenols and nutrigenomics, Dr. Milenkovic leads research on how plant compounds affect gut-brain, cardiovascular, and metabolic pathways. With over 100 peer-reviewed papers, his work deepens our understanding of how bioactives like flavonoids influence inflammation and cellular health.
Dr. Dragan shares his home in North Carolina with his family, which includes the very snuggly Rookie (dog) and Willow (cat).
Dr. Bart Dunsford, PhD, PAS
Pet Nutrition & Product Development Expert
Dr. Dunsford is a leader in pet nutrition and functional product development, with over 25 years of experience formulating solutions that meet the highest standards of efficacy and safety. As a longtime industry innovator, his work spans probiotics, prebiotics, postbiotics, and the real-world considerations of bringing advanced microbial solutions to pets.
At PETNUTRA, he advises on formula architecture, ensuring G-Loop™ delivers the right nutrients, in the right way, every day.
Dr. Dunsford lives in Colorado with his three rescue Shiba Inus, Yuki, Sachi, and Luna.
Rob Brewster
Founder, PETNUTRA | Ingredient Industry Veteran
Rob Brewster comes from a lineage of ingredient innovators — and he’s carried that legacy into the world of pet health with a mission to rethink what’s possible in canine wellness. Before founding PETNUTRA, Rob spent decades sourcing and developing natural actives for leading health and nutrition companies through Ingredients by Nature, his family-run business rooted in science and sustainability.
With PETNUTRA, Rob brings his deep understanding of bioactive compounds, clinical validation, and formulation strategy to a space that’s long lacked innovation. He led the charge to adapt ERIOMIN® — a patented citrus bioflavonoid shown to activate GLP-1 in humans — for safe, effective use in dogs.
As the visionary behind G-Loop™, Rob continues to bridge the gap between advanced human science and everyday pet wellness — with the same rigor, heart, and integrity that have defined his career.
Note: Photo of Rob coming soon. This is his daughter, future PETNUTRA CEO!
Real science. Real dogs. Real results.
G-Loop™ reflects the work of world-class scientists translating complex research into something beautifully simple: one daily serving that supports your dog’s long-term health.
Dr. Stephanie Lipp, DVM
Dr. Stephanie Lipp has dedicated nearly 30 years to helping pets live healthier, longer lives. A UC Davis graduate and practicing veterinarian, she brings deep clinical insight and a lifelong passion for preventive care to PETNUTRA’s mission. Her hands-on experience gives our team a real-world understanding of what pets need to thrive, helping bridge veterinary practice with emerging longevity science. When she’s not in the clinic, you’ll find her volunteering at community spay-neuter programs or fostering animals in need.