Zai Health
Verified listingAbout Zai Health
What is Zai Health?
Zai Health is a clinic in Thousand Oaks, California, with a second office in Ojai. It works mainly as a primary care and urgent care practice, and peptide therapy is one of its services, not the whole business. The clinic lists primary care and wellness, urgent care, injury care, lab tests, peptides and weight loss, IV therapy, x-ray and diagnostic services, and vaccines and injections. The clinic also mentions an in-house pharmacy but does not say what it dispenses.
The one prescriber named is Mohammed T. Rezai, DO. The clinic describes him as double board-certified, a diplomate of the American Board of Family Medicine and the American Board of Preventive Medicine, with a specialization in Addiction Medicine. Visits can be in person or through a virtual platform, and the clinic serves Ventura County and Los Angeles County. Its Google listing shows a 5 rating from one review. You can call (805) 800-8040.
For readers here for peptides, the clinic's own wording is: "We offer personalized peptide therapy programs designed to meet each patient’s unique needs and health goals." It does not name which peptides it uses, and it does not name a weight loss medication.
This listing is for its Thousand Oaks office at 455 Thousand Oaks Blvd.
What does it cost?
The clinic publishes membership prices for primary care: $150 a month for an individual, $250 a month for an individual plus a spouse or child up to age 26, and $300 a month for a family of 3+. It does not say whether those fees include medication, or whether they cover every service on its list.
Other costs are set separately. Basic on-site lab tests carry no extra charge, and members get negotiated cash discounts on tests sent to outside labs, which are discussed before they are ordered. X-rays are listed as free to members, but a radiologist's reading fee applies, and a second version of its services list shows the x-ray at $15. Imaging such as an MRI goes to a partner, where you can use a member discount or your insurance.
It does not publish prices for peptide therapy, weight loss care, or IV therapy. It does not publish a consultation fee, and it does not say whether it accepts insurance.
What should you ask before you book?
Ask who writes and signs the prescription for any peptide or weight loss medication, and whether that will be Dr. Rezai. Ask whether the monthly membership includes any medication, or whether drugs are billed on top. Ask whether each peptide is brand-name or compounded, and who makes it, since the clinic mentions an in-house pharmacy without saying what it fills.
Ask what the first consultation costs, and what follow-up visits and lab work cost each time. Ask how the membership is billed and how you cancel. Ask whether a radiologist's reading fee applies to your x-ray, and which x-ray price is correct.
Who is it a good fit for?
This is a good fit if you want a primary care practice with same-day visits, a monthly membership fee you pay yourself, and a choice between in-person and virtual visits. If peptide therapy or weight loss medication is the reason you are calling, put the questions above first, because the clinic names neither its products nor their prices.
Sources: zaihealth.com, zaihealth.com/services, zaihealth.com/about, zaihealth.com/contact
Services Offered
What we confirmed
Read off Zai Health’s own website on 2026-10-14. These are their words, not ours.
- ✓Peptide therapy — listed on their site as “We offer personalized peptide therapy programs designed to meet each patient’s unique needs and health goals.” source
We have not yet collected published prices or prescriber credentials for this clinic. When we do, they will appear here with a link to the page they came from — or a note saying the clinic publishes none, which is itself worth knowing. Call them for a price in the meantime.
Hours
Mon - Fri: 9:00am - 5:00pm