Founder and Medical Director
Institute for Progressive Medicine
February 1, 2026
Dear Patient and Friend,
I have been practicing medicine for over 55 years. During this time, I have benefited enormously from my experience with patients, for which I will always be grateful.
I firmly believe the relationship between doctor and patient should be a collaboration. A doctor should clearly explain what he knows and the patient should also be allowed to explain what he or she needs and wants. Medical decisions should always be made based on mutual understanding.
Over the past year I have experienced some significant medical complications that have led me to decide to retire and close my practice. I greatly appreciate having worked with you, teaching you and being educated by you. There has been no better reward than seeing patients improve and recover under my guidance.
Our staff and I will be available to assist you until we close. I wish you all the best in your continued pursuit of health and happiness.
Sincerely,
Allan Sosin, MD
The final day for patient services at IPM will be March 31, 2026.
Click the links below for more information
Referrals
For your convenience, below are several local providers who have experience in integrative and alternative medicine and who are currently accepting new patients. Some of these locations are currently accepting medical insurance for specific services.
Anne Zuzelski, MD – Physiatry, PM&R, Injection Specialist
UCI Susan Samueli Center – Irvine, CA
Tel. (949) 824-7000
https://www.ucihealth.org/locations/irvine/susan-samueli-integrative-health-institute
Martha Wittenberg, MD – Family Practice, Hormones, IV services, ozone and more
www.marthawittenbergmd.com
Tel. (949) 464-8575
Karen Sun, MD – Internal Medicine
The Integrative Wellness Center – Irvine, CA
Tel. (949) 768-6780
https://theintegrativewellnesscenter.com/
Sam Sunshine, MD – Family Medicine/Sports Medicine
OC Sports and Wellness – Foothill Ranch, CA
Tel. (949) 460-9111
https://ocsportsandwellness.com/
Additional Referral Resources
Medicare Physician Finder
https://www.medicare.gov/care-compare/?guidedSearch=Physician&providerType=Physician
American Academy of Ozonotherapy
www.AAOT.us
American College for the Advancement in Medicine
www.acam.org/
American Academy of Anti-Aging Medicine
www.a4m.com/
Accounts Information
For information about your account at IPM while you were a patient here, e-mail accounts@iprogressivemed.com.
Please note, there will be a delay in response while we update and relocate our systems April-May 2026.
Purchase Supplements
A Bright Future is Ahead!
The IPM Supplement Store will re-open in late May after a short break. At that time we will offer online and phone orders. To order products when we reopen, visit:
For information on how to find specific supplements or products, or questions about the IPM supplement store, please e-mail us here:
Medical Records Access
Morgan Records Management, LLC is the official HIPAA compliant records custodian. Records will be securely maintained for at least 7 years from your last date of service.
We strongly recommend waiting until mid-April 2026 before requesting records from Morgan Records Management so that we may ensure all of our data has been securely transferred.
Morgan Records Management is the ONLY way to request medical records for IPM patients.
https://morganrecordsmanagement.com/request-my-records/
Email: Medical@MorganRecords.com 📞 Tel. (833) 888-0061
Prescriptions
We can help you with prescription requests up to our closing date of. After March 31, 2026 patients will need to have another doctor provide prescription recommendations and refills.
Please make sure you have established a relationship with a new physician so you will not run out of any medication.
Frequently Asked Questions
After Dr. Sosin retires, will I still be able to see a doctor at IPM?
No, After March 31, 2026 Institute for Progressive Medicine will be closing permanently. Martha Wittenberg, MD and Anne Zuzelski, MD will be seeing patients in new locations locally. See the referrals section on this page for more details.
Will Dr. Sosin provide phone appointments after IPM closes?
At this time there are no plans for Dr. Sosin to continue seeing patients or providing phone consults. If this changes, we will post updated information here and notify our patient list.
Where can I see Dr. Zuzelski?
Dr. Zuzelski is accepting patients at UCI Samueli Center. Call (949) 824-7000 for more information, or visit this link:
https://www.ucihealth.org/locations/irvine/susan-samueli-integrative-health-institute
Where can I see Dr. Wittenberg?
Dr Wittenberg is available for telemedicine consultations now, and will see patients for in-person consults and services beginning in May 2026. Please contact her office at (949) 464-8575 and visit her online at this link:
https://www.marthawittenbergmd.com/
How will I refill my prescriptions?
New prescriptions and refills will be available at IPM through end of day, March 31, 2026. After this time, prescriptions will need to be renewed and obtained through another physician. Please see the referral section above for referral information.
Where can I get Ozone Therapy?
Martha Wittenberg, MD will be offering ozone therapies in her new location. Please call her office at (949) 464-8575 or visit her online here: https://www.marthawittenbergmd.com/
Where can I get nutritional IV therapy?
Martha Wittenberg, MD will be offering ozone therapies in her new location. Please call her office at (949) 464-8575 or visit her online here: https://www.marthawittenbergmd.com.
Many of the physicians listed in our referral section provide IV therapy.
What about Hormone replacement therapy and Hormone Pellets?
Martha Wittenberg, MD will offer hormone pellet therapy in her new location! We encourage you to contact her to set your next appointment for pellets. Call (949) 464-8575 or visit her online here: https://www.marthawittenbergmd.com/
Most of the physicians listed in our referral section provide BHRT and pellet procedures. We encourage you to contact the offices listed to find out which one will be the best fit for you. If you have an appointment at IPM before our closing date, we can help you with appropriate referral information for pellet therapy.
I have been ordering my supplements from IPM. How will I continue to get them?
A Bright Future is Ahead! The IPM Supplement Store will re-open in late May after a short break. At that time we will offer online and phone orders. To order products when we reopen, visit:
For information on how to find specific supplements or products, or questions about the IPM supplement store, please e-mail us here:
What will happen to IPM Private Label Products?
Most of the Private Label products we carry are made for us by Orthomolecular Products and are available in Orthomolecular labels, which we will carry in our store. If you have any questions about how to find these items, please e-mail us at orders@iprogressivemed.com
How will I contact IPM?
Phone, fax and e-mails will remain active and be answered through March 31, 2026. orders@iprogressivemed.com will remain active for questions about supplement orders after our closing date.
