Thinner At Last
Verified listingAbout Thinner At Last
What is Thinner At Last?
Thinner At Last is a medical weight loss practice in San Dimas, California, at 1305 West Arrow Hwy., Suite 107. It has been operating since 1995, and the prescriber listed is R. Stephen Jennings, MD. The practice offers a medical weight loss program built around phentermine along with injectable weight loss treatment, personalized diet plans, guided exercise programs, and what it describes as mindset and willpower coaching. Telemedicine is available, and the office is open Tuesday through Thursday, 8:30 AM to 5:00 PM, with shorter hours on Friday.
The weight loss program combines prescription medication, when appropriate, with nutritional counseling and lifestyle changes, all under physician supervision. Phentermine is named specifically as part of that program. Separately, the injectable weight loss page describes appetite regulation, metabolic support, and nutrient optimization injections, though it does not name a specific drug on that page. A patient review mentions semaglutide, but that is the patient's word, not a service the clinic names itself.
What does it cost?
No prices are published for the medical weight loss program, the phentermine plan, or the injectable treatments. There is no consultation fee listed, no statement on whether monthly costs include medication, and no insurance information. Anyone interested will need to call (909) 592-1961 to get actual numbers before deciding anything.
What should you ask before you book?
Since pricing is not posted anywhere, start there: ask what the initial consultation costs and what a typical month runs once you are on a program. Ask directly whether the injectable medication is included in any quoted fee or billed separately, and ask whether what you are prescribed is brand-name or compounded. Ask who actually examines you and writes the prescription, since R. Stephen Jennings, MD is the only prescriber named. Ask what follow-up visits and any lab work cost, and whether telemedicine visits are priced the same as in-person ones. If you are considering phentermine, ask how long a typical course runs, since it is generally used short-term. Finally, ask about cancellation if you sign up for an ongoing program, since none of that is spelled out publicly.
Who is it a good fit for?
This is a good fit if you want a physician-run weight loss practice with decades in the same San Gabriel Valley location, offering both phentermine and injectable options alongside diet and coaching support. It is less of a fit if you need firm pricing or insurance information up front, since none of that is available without a phone call.
Sources: thinneratlast.com, thinneratlast.com/medical-weight-loss-program, thinneratlast.com/about-us
Services Offered
What we confirmed
Read off Thinner At Last’s own website on 2026-10-10. These are their words, not ours.
- ✓Medical weight loss — listed on their site as “Medical Weight Loss Program” 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
Tue - Thu: 8:30 AM - 5:00 PM