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6 providers
Availability last updated 03/07/2026
The Longevity Collective is where wellness meets innovation, empowering adults across Marin County to live vibrantly and age with confidence. Nestled in the heart of Fairfax, California, our practice isn’t just a clinic—it supports your lifestyle. Each treatment is here to revive, destress and reenergize your body and mind.
We have state-of-the-art treatments grounded in science yet driven by our belief that age is just a number. The Longevity Collective team offers a dynamic suite of services: red light therapy, acoustic soundwave therapy, cranial therapy, peptide therapy, concierge medicine and pulsed electromagnetic field (PEMF) therapy. With the effectiveness of our cold plunge tubs followed by an infrared sauna, every visit is an experience of self-renewal tailored to your wellness needs.
Sessions here aren’t just an appointment. We offer new anti-aging and wellness experiences and we won't rush you out. We want to support your wellness goals. Our team will listen to your needs and recommend a plan that is right for you. Whether it’s alleviating pain, restoring energy, rejuvinating your skin, or talking with Dr. David Baldini, every recommendation is designed with one goal: to unlock the energy and vitality of every person who walks through our doors.
Start your journey with The Longevity Collective today—where each of our unique treatments brings you closer to your health goals. Call the office or request a consultation online today.
James Slezak, MD
Surgeon
771 Center Blvd
Fairfax, CA 94930
Dr. Melissa Loja, MD, MAS, FACS, FSVS, RPVI, completed medical school at the University of California at Davis. She went on to be among the first in the nation to complete a specialized integrated vascular surgery residency program at the University of California at Davis. Dr. Loja was selected for the highly competitive NIH funded T32 research grant, which led to widely cited publications. She attained a Master's degree in Clinical and Translational research from these efforts. In addition, she holds a Bachelor's degree in Biologic Sciences, also obtained at the University of California at Davis. Dr. Loja specializes in vascular and endovascular surgery, including carotid artery disease, aneurysm repair, dialysis access, treatment of mesenteric and renal artery disease and lower extremity revascularization. Among her clinical interests, limb salvage and peripheral arterial disease with a multidisciplinary focus is a particular passion of hers. She is expertly trained and highly skilled in endovascular as well as surgical management of peripheral arterial disease.
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Dr. Melissa Loja, MD
Surgeon
2301 Camino Ramon
Suite 290
San Ramon, CA 94583
Burzeen E. Karanjawala, MD, is a colorectal surgeon at Sacramento Colon and Rectal Surgery Medical Group. He sees patients at the Sacramento and Roseville, California, offices.
Dr. Karanjawala obtained a Bachelor of Arts in molecular and cell biology from the University of California, Berkeley. He also earned a Master of Science in physiology and biophysics from Georgetown University in Washington, DC.
Dr. Karanjawala graduated from medical school at New York Medical College in Valhalla, New York. He did his general surgery residency training at the University of Texas Health Science Center in Houston, Texas. He then completed his colon and rectal surgery residency at UT Physicians Colon and Rectal Clinic – Texas Medical Center in Houston, Texas.
Dr. Karanjawala worked for two years at the Lyndon B. Johnson General Hospital in Houston, Texas, first as a clinical instructor and then as an assistant professor.
He is board certified in both general surgery and colon and rectal surgery. Dr. Karanjawala has an interest in a wide variety of colorectal disorders. He is passionate about minimally invasive surgery and robotic surgery. He is also skilled at endoscopy and is keen on the surgical management of inflammatory bowel disease.
2023 Sutter Independent Physicians President’s Award Recipient for Excellence in Patient Care
Burzeen Karanjawala, MD
Colorectal Surgeon
1020 29th Street
Suite 350
Sacramento, CA 95816
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