One doctor. Decades of practice. Orange County, since 1999.
The practice is built around one principle: men’s health works better when it’s the same doctor every visit, the same chart, the same conversation continuing.
Garden Grove · Mon–Fri 9 AM – 5 PM
A solo physician practice in Orange County since 1999.
Dr. Castellano graduated from UC Irvine School of Medicine in 1996 and went directly into family medicine practice in Orange County. Board certification in Family Medicine (ABFM) followed early in the career. Advanced certifications in Anti-Aging and Regenerative Medicine (ABAARM) and the Anti-Aging & Regenerative Medicine Fellowship were added as the practice's focus narrowed toward men's health and hormone optimization. Membership in the American Academy of Anti-Aging Medicine has been continuous.
The practice has always run as a solo physician. That's intentional. Men's health works better when the doctor reading the bloodwork at month one is the same doctor reading it at month thirty-six — patterns get spotted because the same eye keeps watching, and the trust gets built because the same conversation keeps going. Most patients come through referrals from other patients. That's the part Dr. Castellano is most proud of.
The first visit isn't a ten-minute encounter. New-patient consultations are scheduled for an hour with no scripted protocol — the doctor walks through your history, reviews any bloodwork you bring in, and either orders a full panel or starts the diagnostic conversation around what you already have. Patients with complex pictures (multiple medications, metabolic and hormone overlap, prior-clinic plans that didn't fit) typically get more time. The diagnostic process drives the visit length, not the other way around.
What thirty years of practice actually means: pattern recognition. Judgment honed over thousands of patient years. Knowing when to refer out. Knowing when to wait. Knowing what a lab trend means before it becomes a diagnosis.
The credentials behind the practice.
A real medical credential is a multi-year process. Here's the timeline that built the practice.
- 1996Doctor of MedicineUC Irvine School of Medicine
- BoardABFMAmerican Board of Family Medicine
- AdvancedABAARMAmerican Board of Anti-Aging & Regenerative Medicine
- FellowshipFAARFMAnti-Aging & Regenerative Medicine Fellowship
Member, American Academy of Anti-Aging Medicine (AAAAM).
“I have a fee-for-service private practice, so if you don’t like me or what I have to say, you are free to take your money elsewhere. That’s how a free market system works — only those who offer true value should be rewarded.”
Three principles. Held since 1999.
Labs anchor every decision.
Every treatment decision starts with lab values. If the panel doesn't justify a protocol, the protocol doesn't get prescribed — even if the patient came in expecting one. The honest "no" is part of the practice.
Same doctor, every visit.
Hormone work is a moving picture; the trend line IS the diagnosis. Same eye on it every visit means patterns get caught early. No rotating providers, no PA-on-alternating-months. The continuity is the care.
Narrowest effective intervention.
Treatment is sized to what the panel calls for and adjusted at the 6-week recheck based on response. Polypharmacy that didn't earn its place gets reduced — sometimes a primary-care medication can come off when the underlying hormone or metabolic picture is treated. That's a specific decision, not a default.
Men in Orange County, mostly between 35 and 70.
Patients come in for one of three patterns: energy, sleep, mood, or drive that doesn't track to anything obvious and hasn't responded to lifestyle changes; recent bloodwork from primary care that flagged a borderline number and raised more questions than it answered; or prior experience at a chain TRT clinic that didn't include the labs-led conversation, the same-doctor continuity, or the honest "this might not be the right call" framing.
Many patients arrive after a referral from a current patient — that's been the practice's primary growth channel for three decades.
We see patients from Garden Grove, Anaheim, Westminster, Stanton, Santa Ana, Cypress, Buena Park, Orange, Fountain Valley, Huntington Beach, Costa Mesa, Tustin, Fullerton, Long Beach, Los Angeles, and across Orange County.
Men's health, end to end.
Eight service surfaces, all run from the same Orange County office, all tied back to the same diagnostic framework.
Testosterone Replacement Therapy (TRT)
$250/mo flat — labs and follow-ups included.
Hormone Support Therapy
Beyond testosterone — the full hormone panel read together.
Anti-Aging Care
Anti-Aging Fellowship-trained framework, evidence-driven.
Medical Weight Loss
Labs first, then the plan.
Hair Loss
Hormonal + nutritional + scalp evaluation, together.
Erectile Dysfunction
Discreet vascular + hormonal + lifestyle work-up.
Peptide Therapy
Case-by-case from FDA-permissible categories.
Anabolic Steroid Care
Labs-led care for men coming off cycles or weighing the decision.
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.