Skip to content
Castellano Health Institute
(714) 530-2183
Hormone Support · Orange County

Hormone support, beyond just testosterone. Read together, not in pieces.

What looks like low testosterone is often a thyroid signal, a cortisol pattern, or a metabolic issue producing the same symptoms — and a testosterone-only protocol misses it. Dr. Castellano works from what your case actually needs — building on prior bloodwork where it's useful, ordering whatever pieces of the hormone, thyroid, adrenal, and metabolic panel the picture calls for — then prescribes the narrowest intervention the data justifies. Sometimes that's TRT. Often it's thyroid work or metabolic correction instead.

Call to ScheduleSee what gets checked
Same doctor every visitFull panel, not one markerLabs-led
What the initial panel covers
  • Total + free testosterone
  • Full thyroid (TSH, free T4, free T3)
  • Morning cortisol
  • Estradiol (E2)
  • Fasting glucose + HbA1c
  • Lipid panel + vitamin D
  • CBC + comprehensive metabolic panel
Call (714) 530-2183

Initial visit + panel scoped per patient. No long-term contract.

Why Men Come In

The signals that bring men in for a fuller hormone read.

Some men come in after a TRT consult that didn't feel complete — the testosterone number alone didn't explain how they were feeling. Others come in for energy / sleep / mood / weight that didn't track to any single obvious cause. Patterns to watch for after 35:

Take the 2-minute self-assessment
  • Energy that drops by mid-afternoon and doesn't refill with sleep or coffee
  • Stubborn weight that won't move with the same diet that worked five years ago
  • Sleep that doesn't refill the tank — tired even after 7-8 hours
  • Mood, focus, or motivation that feel flatter than baseline
  • Cold intolerance, hair changes, or skin shifts that suggest thyroid involvement
  • Stress that hits harder than it used to and takes longer to recover from
  • Strength and recovery slipping despite the same effort at the gym
  • Lab values from another clinic that flagged "borderline" without context
Gloved hand holding a blood draw tube in a clinical lab — the full hormone panel evaluated together at Castellano Health Institute
What Gets Checked

The full hormone panel. Read together, not in pieces.

A real hormone work-up looks at the system, not the slice. Here's what Dr. Castellano runs on the initial panel and why each piece matters.

Total + free testosterone

The bound vs. bioavailable picture. Most clinics check only total T; the free fraction is what tissues actually see.

Thyroid (TSH, free T4, free T3)

Fatigue, weight, mood, and even libido symptoms often track to thyroid before they track to testosterone. Worth ruling in or out before any hormone protocol.

Cortisol (morning + sometimes diurnal curve)

Chronic high or low cortisol disrupts testosterone production. The cortisol-testosterone relationship is well documented; the panel should reflect it.

Estradiol (E2)

Testosterone converts to estradiol via aromatase. Too low or too high E2 causes its own symptoms; needs to be read alongside testosterone, not after.

Metabolic markers

Fasting glucose, HbA1c, lipid panel, vitamin D. Insulin resistance, vitamin D deficiency, and dyslipidemia all shift hormone behavior. Treating the hormone without the metabolism leaves the picture half-finished.

How It Works

Four steps. Built around your panel, not a script.

  1. 01

    Sit-down visit

    1-hour, 1-on-1 with Dr. Castellano. He walks through the panel with you marker by marker, explains what the patterns suggest, and lays out options without pressure to upsell anything.

  2. 02

    Full panel

    Lab order goes out from the visit. ~30-45 minutes at the lab. Castellano orders the wider hormone + thyroid + adrenal + metabolic panel up front, not piecemeal.

  3. 03

    Plan the narrowest-effective intervention

    Sometimes that's TRT, sometimes it's thyroid work, sometimes it's lifestyle plus recheck in 8 weeks. Treatment matches the patterns; nothing prescribed that the panel doesn't justify.

  4. 04

    Recheck + adjust

    Labs at 6 weeks, then quarterly. Same doctor reading the trend line. Adjustments based on numbers and how you feel — both have to track together.

Why a Panel-Led Approach

One number doesn't make a diagnosis. The relationships between them do.

Hormone systems are interlocked. A testosterone result without thyroid context, cortisol context, or metabolic context tells you almost nothing about what's actually driving the symptoms. The panel — read against your case — is what surfaces the real picture.

Relationships, not single numbers

A testosterone number alongside high cortisol means something different than the same number alongside normal cortisol. A borderline T alongside subclinical hypothyroidism means something different still. The diagnosis lives in how the markers relate — not in any one number.

Upstream catches what downstream misses

When thyroid is the driver of what looks like low T, treating testosterone alone burns months without fixing anything. Insulin resistance shifts hormone behavior across the panel. Reading the upstream signal first means the intervention lands where the actual problem is.

Right-sized to the panel

Sometimes the right answer is TRT. Often it's thyroid work, cortisol regulation, lifestyle adjustment, or recheck in 8 weeks. The protocol gets sized to what the panel actually justifies.

Often what feels like low T is actually a thyroid or adrenal pattern. A focused testosterone-only protocol misses what the wider panel catches. The same hormone framework forms the backbone of any honest anti-aging plan.

Dr. Castellano — Orange County men's hormone-support physician since 1999
About the Doctor

Dr. Castellano — Orange County, since 1999.

Trained at UC Irvine School of Medicine ('96). Board-certified in Family Medicine (ABFM). Advanced certifications in Anti-Aging and Regenerative Medicine (ABAARM, Anti-Aging Fellowship). Three decades of practice in the same Orange County market.

The hormone-support framework is built around the same principle the rest of the practice runs on: same doctor every visit, same chart, the same conversation continuing. Trend lines get read by an eye that's been on the case the whole time.

UC Irvine '96
School of Medicine
ABFM
Family Medicine
ABAARM
Anti-Aging board
Fellowship
Anti-Aging
Common Questions

The questions men actually ask before they call.

Don't see yours? Call the office and ask Dr. Castellano directly.

What's the difference between TRT and hormone support therapy?
TRT focuses on testosterone alone. Hormone support runs the wider panel — thyroid, cortisol, adrenal, estradiol, and metabolic markers — and reads them together. Sometimes the panel comes back saying TRT is the right call. Often it says something else (thyroid, sleep, metabolism) is the bigger driver. The whole point is to find out which. For patients actively using anabolic-androgenic steroids — or recovering from a past cycle whose hormones haven't bounced back — see the dedicated anabolic steroid care page, which scopes the work to that specific clinical picture.
What's actually included in the initial hormone panel?
Total and free testosterone, estradiol (E2), TSH with free T3 and T4, morning cortisol, fasting glucose with HbA1c, lipid panel, vitamin D, and a CBC + comprehensive metabolic panel for baseline. If the symptom picture suggests something specific (sleep, adrenal stress, thyroid antibodies), the panel expands to fit.
How is this different from what a primary care doctor would order?
Most primary-care panels check TSH and total testosterone and stop. Hormone support adds the free-fraction testosterone, the full thyroid panel (free T3 and T4, not just TSH), morning cortisol, estradiol, and the metabolic markers that affect hormone behavior. The reading also looks at the panel as a system, not marker-by-marker.
Does Dr. Castellano use bioidentical hormones?
When hormone replacement is indicated, the practice uses FDA-approved bioidentical preparations — molecularly identical to what the body makes. Compounded or non-FDA-approved formulations are not part of the protocol unless there's a documented clinical reason and the patient understands the trade-offs.
How long does it take to feel a difference?
Energy and sleep often shift in the first 3-4 weeks if the panel pointed to a hormone driver. Mood, body composition, and the harder-to-measure pieces usually settle in by the 8-12 week recheck. Sometimes the labs improve before the patient feels the change; sometimes the patient feels better before the labs catch up. Both happen, and both get tracked.
What if testosterone is in the "normal" range but the patient still feels off?
That's a common reason for the broader panel. "Normal" reference ranges are population-wide and don't account for what's normal for the individual. Dr. Castellano reads testosterone alongside thyroid, cortisol, estradiol, and metabolic markers — the symptom picture often resolves once the bigger pattern shows up.
Is hormone support the same as anti-aging?
They overlap. Honest anti-aging is built on the same hormone panel — getting baseline values, finding what's off, treating the cause not the symptom. Castellano's Anti-Aging Fellowship informs the framework. The anti-aging service page covers the longer-arc piece.
Does the practice treat both men and women for hormone issues?
The practice focuses on men's health. Women's hormone work (perimenopause, menopause, OB-GYN hormone care) is better served by an OB-GYN-led practice. Castellano refers when that's the better fit.
What's the cost?
Hormone support is bespoke based on what the panel calls for. The initial panel + 1-hour consult is the entry point; from there, the plan and the monthly cost get scoped to the patient. The practice runs cash-pay, no insurance billing for these visits, and the front desk hands over receipts if the patient wants to submit for partial reimbursement (HSA / FSA cards work in most cases).
Does the practice treat men outside Garden Grove?
Yes — patients drive in from across the Orange County corridor (Anaheim, Westminster, Santa Ana, Stanton, Cypress, Buena Park, Orange, Fountain Valley) and the wider edge (Huntington Beach, Costa Mesa, Tustin, Fullerton). The clinic sits right off the 22 with free parking.
Patient Voices

Real patients. Real reviews. Verified by Google.

Serving Orange County

Hormone support for the Orange County corridor.

The clinic sits on S Euclid St in Garden Grove — easy reach from Anaheim, Westminster, Santa Ana, and the wider OC corridor. Free on-site parking.

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.

Ready when you are

Book the 1-hour consult.

Call the office directly or send a quick note. Dr. Castellano (or his front desk) will get back the same business day to confirm a time.

Call (714) 530-2183Get directions
12460 S Euclid St, #101 · Garden Grove, CA 92840
Mon–Fri 9 AM – 5 PM

Calling after hours? Leave a message — we’ll get back to you the next business day.