Meet the Team
Behind Lean Lab

Mashhoud Zarabi

Founder

Mashhoud's journey into regenerative health began through his own experience with Crohn's disease. The conventional path centered on long-term medication, which began taking a toll on his overall health and quality of life.

Determined to find a different approach, he immersed himself in research on regenerative medicine, peptides, metabolic health, and emerging therapies focused on improving the body's ability to function and recover. Through that process and by working with medical professionals already practicing in regenerative medicine, he was able to come off medications and completely rethink his approach to health.

Lean Lab was born from that experience. His vision is to create a place where people can access innovative therapies in a structured, medically supervised environment — helping patients take a proactive role in their health and performance.

Bianca Tomassian, PA-C

Co-Founder

Bianca Tomassian, PA-C brings over a decade of clinical experience to Lean Lab. With more than 10 years in family medicine and general practice, she developed a strong foundation in comprehensive patient care and a deep understanding of the physiological systems that influence whole-body health.

Over the course of her career, Bianca developed a focused interest in metabolic health, preventative medicine, and the role advanced therapies can play in helping patients improve outcomes beyond traditional treatment models.

At Lean Lab, she specializes in regenerative health, hormone optimization for both men and women, and medically supervised weight loss. Her approach centers on personalized care and evidence-informed therapies designed to fine-tune metabolic and hormonal balance.

Dr. Shant Tomassian, MD

Medical Director

Dr. Shant Tomassian, MD serves as Medical Director at Lean Lab, providing the clinical oversight and medical leadership that underpins every program and protocol offered at our clinics.

With a background in medicine and a deep commitment to patient-centered care, Dr. Tomassian ensures that all therapies at Lean Lab are delivered within a rigorous, evidence-informed framework. His role spans clinical governance, protocol development, and the ongoing evaluation of emerging therapies in regenerative and metabolic health.

Dr. Tomassian's leadership reflects Lean Lab's core belief that advanced wellness therapies should be grounded in sound medical practice — personalized, supervised, and held to the highest standards of care.