Stem Cell Institute

Stem Cell Institute is a nonsurgical regenerative medicine practice on Wilshire Boulevard in Los Angeles, California.

Clinicians

• Marc Darrow, MD, JD — physical medicine and rehabilitation specialist

Regenerative treatments offered

• Stem cell therapy — bone marrow concentrate
• Platelet-rich plasma (PRP) — including PRP with hyaluronic acid for knees
• Prolotherapy — for joints, tendons, ligaments and the neck

Conditions the practice lists

Knee osteoarthritis, ACL, meniscus and patellar tendon problems; sciatica and post-operative back pain; hip impingement; neck pain after surgery; chronic ankle instability; rotator cuff tears, frozen shoulder, shoulder instability and SLAP tears; tennis elbow, TFCC tears, carpal tunnel and thumb arthritis; plantar fasciitis and Achilles tendon injuries.

What to know before you call

• Toll-free (800) 300-9300 and local (310) 231-7000; online contact form and “Are you a candidate?” request
• Office hours Monday to Friday, 9 a.m. to 5 p.m.
• The site states the practice does not provide IV treatments
• Prices and insurance policies are not published

RPG verification notes

• Website states that stem cell and PRP procedures are not approved by the FDA
• Physician biography page on the site
• Prices not published

Last verified by Regen Provider Guide: October 2026. Confirm treatment details, candidacy, insurance coverage and costs directly with the practice. RPG makes no claim about the effectiveness of any treatment.