Optimal Performance by Stassi
Verified listingAbout Optimal Performance by Stassi
What is Optimal Performance by Stassi?
Optimal Performance by Stassi is a cash-pay clinic at 112 W Bethalto Blvd, Bethalto, IL 62010-1703. Hormone therapy is its main work. It lists two services: testosterone replacement therapy (TRT) and a medically guided weight loss program. Peptide therapy also comes up, with Sermorelin and NAD+ named as examples, but it is not listed as a service of its own. The clinic became a reality in March 2025. In its own words on testosterone: "The intent is normalization, not excess hormone replacement." The phone number is 618-977-6332.
The one prescriber named is Mary Brooks, APRN, FNP-C, MSN, PMHNP-BC, a nurse practitioner whose stated focus includes hormone replacement therapy and metabolic health. Kory Stassi owns and runs the clinic. His bio calls him Dr. Stassi, but no credentials are published for him. The medications named are semaglutide and tirzepatide. Stassi Chiropractic shares the same website, and the same operations director runs both practices. Google lists the clinic as a medical clinic, rated 5 with 10 reviews.
This listing is for its Bethalto office at 112 W Bethalto Blvd.
What does it cost?
It does not publish prices or a consultation fee. It does not say whether medication is included in any price. It does not take insurance, so you pay out of pocket. Most patients can use HSA or FSA funds for TRT, peptide therapy, and weight-loss prescriptions. Membership terms and cancellation are not described.
Labs come first. If yours are from within the last 3 months, you can bring them. If not, the team orders them at your first visit. Treatment usually begins 7 to 10 days after labs are reviewed and medically approved, and ongoing monitoring continues from there.
What should you ask before you book?
Start with the prescription. Ask whether Mary Brooks reviews your labs and writes your prescriptions, and who handles follow-up with you. Ask whether the fee includes the medication, and whether semaglutide and tirzepatide are brand-name or compounded. Neither point is stated.
Then ask about the rest of the bill. Ask what the initial labs cost and what ongoing monitoring costs, since monitoring covers hormone levels, hematocrit, PSA, and metabolic markers. Ask whether telehealth is offered, because it is not stated, and ask for office hours, which are not listed. Finally, ask how to cancel, and whether any membership or financing applies.
Who is it a good fit for?
This is a good fit if you want hormone therapy or a medically guided weight loss program, can pay cash, and want the full price in writing before you book. It is a weaker fit if you need insurance billing or a published price list before you call.
Sources: opstassi.com, opstassi.com/team, opstassi.com/contact, opstassi.com/blog/oralinjectable-peptides
Services Offered
What we confirmed
Read off Optimal Performance by Stassi’s own website on 2026-10-11. These are their words, not ours.
- ✓Medical weight loss — listed on their site as “A medically guided weight loss program focused on appetite control, metabolic health, and long-term results through personalized treatment and lifestyle support.” source
- ✓Hormone therapy — listed on their site as “Medically supervised TRT to restore testosterone, boost energy, improve mood, and support overall health with personalized care.” source
- ✓Peptide therapy — listed on their site as “Inspired by his own experience, he set out to create a clinic where others could benefit from the transformative effects of testosterone replacement therapy and peptide therapy.” source