Testosterone therapy and men's health for Fullerton. Nine miles straight down Euclid St.
Castellano Health Institute serves Fullerton men nine miles straight down Euclid St — same doctor every visit, full in-house labs, and a protocol sized to what your panel actually says.
Garden Grove · Mon–Fri 9 AM – 5 PM
The Fullerton pattern Dr. Castellano sees most.
Fullerton runs on the campus-and-office corridor — faculty and administrators around Cal State Fullerton, district and city staff, hospital and clinic employees, mid-career professionals commuting the 57 and the 91. The shared occupational fact: fifteen or twenty years of mostly sitting, schedules built around other people’s calendars, and exercise that has slipped from routine to occasional.
The pattern that walks in from Fullerton is gradual — a slide, not a cliff. Weight that crept up a few pounds a year. Afternoon energy that needs propping. Sleep that’s technically happening but doesn’t restore. It gets explained away as “mid-40s, what do you expect” — but the labs usually have a more specific opinion. The TRT evaluation answers the hormone half of it directly — total testosterone, estradiol, LH, a complete blood count, and PSA when age calls for it — read against your symptom history before any protocol gets written. If testosterone turns out not to be the driver, you hear that too.
When the gym stops working, look at the metabolism.
The Fullerton slide — a few pounds a year, afternoon energy that needs propping, sleep that happens but doesn’t restore — usually isn’t a willpower problem or a gym problem. Fifteen or twenty years of mostly sitting reshapes the metabolism itself: insulin sensitivity drifts, body composition shifts, and testosterone tends to fall as that happens. They move together, which is why effort alone stops moving the needle.
Insulin resistance is the quiet driver underneath a lot of it — the body turning progressively deaf to insulin’s signal while the glucose number on a standard report still reads normal for years. Which is why the first question at the first visit is which side is actually carrying your case. The TRT evaluation answers the hormone side. When the weight is on the metabolic side, the testing that measures it — fasting insulin, HOMA-IR, A1C — runs under medical weight loss rather than getting added to every hormone panel by default. Same practice, same doctor, one plan: the testing follows your case instead of your case following a template.
One case, worked from both sides.
The desk years that show up on the scale before they show up on a hormone panel are the same case, not a separate bill. For the Fullerton patient, medical weight loss works the metabolic side on the same flat-fee, no-upsell footing as the TRT program — one practice, one plan, no membership games.
Coming soon.
Dr. Castellano sees Fullerton men every week. Their before-and-after stories will land here as patients give consent to share. In the meantime, ask about results in person — bring your most recent labs and we’ll show you how the trend lines look in practice for Fullerton patients.
The questions Fullerton patients ask most before the first visit.
- How far is the clinic from Fullerton?
- Nine miles straight down Euclid St — the same street runs from Fullerton through Anaheim to the office in Garden Grove. Most Fullerton patients are in and out inside 90 minutes including the lab draw. Free on-site parking at the suite.
- What's the typical protocol cost?
- TRT is a flat $250 a month — that includes the medication, the lab work, and your follow-up visits. No package add-ons, no contract. If TRT isn't the right call after the labs come back, no one is locked in.
- I sit at a desk all day and the gym isn't moving the needle — is that low T?
- Sometimes. A decade-plus of desk work changes the metabolic picture — insulin sensitivity, body composition, sleep quality — and testosterone is one variable among several. The TRT evaluation answers the hormone question directly: total testosterone, estradiol, LH, a complete blood count, and PSA when age calls for it. If your labs and history point at the metabolic side instead, Dr. Castellano tells you that — and the metabolic workup runs under medical weight loss, where it belongs — before anything gets prescribed.
Nine miles straight down Euclid St. Free parking on-site.
Fullerton patients start with the same core program every man here does: testosterone replacement therapy with Dr. Castellano — $250 a month, labs and follow-up visits included. (The initial consultation and bloodwork before starting are a separate service and cost.)
One conversation tells you whether this is the right fit.
Call the office to set up a 1-hour consult with Dr. Castellano. Bring whatever bloodwork you have on file — or fresh labs get ordered up front. Either way, you’ll leave with a real read on what’s going on.
Calling after hours? Leave a message — we’ll get back to you the next business day.