Hormone Replacement Therapy

Hormone replacement therapy (HRT) is a medical treatment designed to supplement or replace hormones that your body no longer produces in adequate quantities. As men and women age, the endocrine system — the network of glands responsible for producing hormones — gradually reduces its output. This decline is a normal part of aging, but it is far from benign. The hormones affected, including estrogen, progesterone, testosterone, thyroid hormones, DHEA, and growth hormone, regulate virtually every system in your body. When they fall below optimal levels, the consequences are felt everywhere.

For women, the most dramatic hormonal shift occurs during perimenopause and menopause, when ovarian production of estrogen and progesterone drops precipitously. This transition, which typically begins in the mid-40s and can span a decade or more, is responsible for the hot flashes, night sweats, mood disturbances, weight gain, and cognitive changes that millions of women endure each year. But hormonal decline is not exclusively a female concern.

Men experience a parallel process known as andropause, characterized by a steady decline in testosterone production that begins around age 30 and accelerates after 50. The symptoms of andropause — fatigue, reduced muscle mass, increased body fat, diminished libido, irritability, and cognitive fog — are every bit as impactful as menopausal symptoms, though they are far less discussed in mainstream medicine.

Hormone replacement therapy addresses these deficiencies by restoring hormone levels to their optimal physiological range. At The Riegel Center in Plano, TX, Christopher J. Riegel specializes exclusively in hormonal medicine, providing the depth of expertise that general practitioners and even many endocrinologists lack. His approach goes beyond simply prescribing hormones. It involves a comprehensive evaluation of your entire hormonal ecosystem, the identification of imbalances and deficiencies, and the design of a personalized treatment protocol that restores balance across all interconnected hormone pathways.

Hormone replacement therapy encompasses several different approaches, and understanding the distinctions is essential for making informed decisions about your care. The three primary categories are conventional synthetic HRT, bioidentical hormone replacement therapy (BHRT), and pellet or implant-based therapy. Each has distinct characteristics, and the choice between them significantly impacts treatment outcomes.

Conventional synthetic HRT uses hormones that are manufactured with intentionally altered molecular structures. The most widely known examples include conjugated equine estrogens (brand name Premarin, derived from pregnant mare urine) and medroxyprogesterone acetate (brand name Provera). These synthetic hormones were the standard of care for decades and were the focus of the Women's Health Initiative study that raised safety concerns in the early 2000s. While synthetic HRT does alleviate some symptoms, the modified molecular structures mean these hormones interact with your body differently than your natural hormones, which can produce unwanted side effects and metabolic consequences.

Bioidentical hormone replacement therapy represents a fundamentally different approach. Bioidentical hormones are derived from plant sources and are processed to be molecularly identical to the hormones your body produces. This structural identity means they bind to the same receptors, activate the same cellular pathways, and are metabolized through the same enzymatic processes as your endogenous hormones. Dr. Riegel uses exclusively bioidentical hormones in his practice because they offer the most natural, effective, and well-tolerated treatment available.

Pellet therapy involves the subcutaneous insertion of small hormone-containing pellets, typically in the hip or buttock area. While pellets provide sustained hormone release, they offer limited ability to adjust dosing once implanted. Dr. Riegel prefers delivery methods that allow for precise, ongoing dose optimization — because achieving optimal hormone balance is an iterative process that requires the flexibility to fine-tune your protocol as your body responds to treatment.

Within the bioidentical category, hormones can be delivered through multiple routes: sublingual (dissolved under the tongue), transdermal (applied to the skin as a cream or gel), or oral capsules. Dr. Riegel selects the delivery method that will provide the best absorption and most stable hormone levels for each individual patient based on their specific hormone needs and metabolic profile.

The decision between bioidentical and synthetic hormone replacement therapy is one of the most consequential choices a patient can make. While both approaches aim to address hormonal deficiency, the way they interact with your body is fundamentally different, and those differences translate directly into differences in safety, tolerability, and effectiveness.

Synthetic progestins, for instance, behave very differently from bioidentical progesterone at the cellular level. Natural progesterone has calming, neuroprotective properties — it supports sleep, reduces anxiety, and protects brain tissue. Synthetic progestins lack these neuroprotective effects and can actually contribute to mood disturbances, a side effect that has driven many women away from conventional HRT entirely. When these women switch to bioidentical progesterone under Dr. Riegel's care, the improvement is often dramatic and immediate.

The same principle applies to estrogen. Bioidentical estradiol is metabolized by your liver through the same pathways used for your own endogenous estradiol, producing the same metabolites in the same proportions. Synthetic estrogens produce a different metabolic profile, which may explain some of the adverse effects observed in studies of conventional HRT. By using hormones that your body recognizes as its own, bioidentical HRT minimizes metabolic disruption while still delivering the full therapeutic benefit of hormone restoration.

Dr. Riegel's patients consistently report that bioidentical hormones feel more natural than synthetic alternatives. This is not placebo effect — it is the predictable result of using hormones that are biochemically indistinguishable from the ones your body was designed to use. When you restore the exact molecules your receptors evolved to interact with, the body responds as nature intended.

Beyond individual patient experience, the broader clinical trend has moved decisively toward bioidentical hormones. Leading medical societies, integrative medicine practitioners, and hormone specialists increasingly recognize bioidentical HRT as the preferred approach for patients seeking safe, effective hormone replacement.

At The Riegel Center, hormone replacement therapy is not treated as a simple prescription. It is a comprehensive medical program built on the principles of precision medicine. Dr. Riegel's approach recognizes that every patient is biochemically unique and that effective hormone therapy must account for the full complexity of individual physiology.

The process begins with an in-depth consultation where Dr. Riegel reviews your complete medical history, current symptoms, lifestyle factors, stress levels, sleep patterns, dietary habits, exercise routine, and treatment goals. This thorough intake ensures that no relevant factor is overlooked and that your treatment plan addresses the full picture of your health, not just isolated symptoms.

Comprehensive laboratory testing follows the consultation. Dr. Riegel orders an extensive panel that includes total and free testosterone, estradiol, progesterone, DHEA-S, pregnenolone, cortisol, full thyroid panel (TSH, free T3, free T4, reverse T3, thyroid antibodies), fasting insulin, hemoglobin A1c, vitamin D, B12, complete blood count, comprehensive metabolic panel, and lipid panel. This thorough testing provides the data necessary to design a truly personalized protocol.

Dr. Riegel then creates your individualized treatment plan, selecting the specific hormones, dosages, and delivery methods that will best address your deficiencies while maintaining safe physiological balance. His proprietary bioidentical formulations are calibrated to your exact needs — there is no guesswork and no one-size-fits-all dosing.

Ongoing monitoring is a cornerstone of Dr. Riegel's approach. Regular follow-up appointments and periodic lab work allow him to track your progress, assess your body's response, and make precise adjustments to your protocol. This iterative optimization process is what separates expert hormone management from the prescribe-and-forget approach that too many clinics employ. True hormone optimization is a dynamic, ongoing partnership between doctor and patient.

Women's hormonal health undergoes several significant transitions throughout life, and each presents unique challenges that hormone replacement therapy can address. The most well-known is menopause, but hormonal disruption can begin much earlier with perimenopause, and younger women may experience hormonal imbalances related to PCOS, thyroid disorders, adrenal dysfunction, or surgical menopause following hysterectomy.

During perimenopause, which can begin as early as the late 30s, hormone levels begin to fluctuate unpredictably. Progesterone typically declines first, leading to estrogen dominance and symptoms such as heavy periods, breast tenderness, anxiety, and sleep disruption. As perimenopause progresses, estrogen levels also decline, and the classic menopausal symptoms emerge: hot flashes, night sweats, vaginal dryness, mood swings, brain fog, and weight gain.

Dr. Riegel's hormone replacement therapy for women addresses these changes comprehensively. Rather than prescribing estrogen alone — as many practitioners do — he evaluates and optimizes the full spectrum of female hormones, including estradiol, estriol, progesterone, testosterone, DHEA, and thyroid hormones. Women need testosterone too, and its decline contributes significantly to fatigue, reduced libido, loss of muscle tone, and diminished motivation. By restoring all relevant hormones to optimal levels, Dr. Riegel helps women not just survive menopause but thrive through it and beyond.

Women who have undergone hysterectomy or oophorectomy (surgical removal of the ovaries) often experience sudden, severe hormonal depletion. The abrupt loss of ovarian hormone production can produce intense symptoms that are even more debilitating than the gradual decline of natural menopause. BHRT is particularly valuable for these women, as it can restore hormonal balance quickly and effectively, dramatically improving quality of life during a challenging transition.

Men's hormonal health has historically received far less attention than women's, but the impact of hormonal decline in men is equally significant. Testosterone is the primary male hormone, and its steady decline with age — often called andropause or "male menopause" — affects millions of men who may not even realize that their symptoms have a hormonal cause.

The symptoms of testosterone deficiency in men are wide-ranging and progressive. Early signs may include subtle fatigue, slightly reduced motivation, and decreased exercise recovery. As testosterone levels continue to fall, more pronounced symptoms develop: persistent fatigue, loss of muscle mass and strength, increased belly fat, reduced libido and erectile difficulty, irritability, depression, poor concentration, and impaired memory. Many men attribute these changes to "just getting older" when in fact they are the direct result of treatable hormonal deficiency.

Dr. Riegel's approach to male hormone replacement goes well beyond simply prescribing testosterone. He evaluates the entire hormonal axis, including free and total testosterone, estradiol (yes, men need appropriate estrogen levels too), DHEA, thyroid function, cortisol, and insulin sensitivity. Testosterone that is converted to excessive estradiol through aromatization can actually worsen symptoms, which is why comprehensive testing and expert management are essential.

Men under Dr. Riegel's care receive customized bioidentical testosterone therapy calibrated to their individual physiology. Dosing is carefully managed to achieve optimal testosterone levels without exceeding the physiological range, and regular monitoring ensures that related markers — including hematocrit, PSA, and estradiol — remain within safe parameters. The goal is not to push testosterone to artificially high levels but to restore it to the range where your body functions at its best.

The results speak for themselves. Men on properly managed bioidentical testosterone therapy consistently report renewed energy, improved body composition, sharper mental function, better mood, enhanced libido, and a restored sense of vitality and confidence. These are not cosmetic improvements — they represent a fundamental restoration of physiological function that impacts every dimension of health and quality of life.

Beginning hormone replacement therapy at The Riegel Center is a straightforward, well-organized process designed to get you started quickly while ensuring thoroughness at every step. Whether you visit our Plano, TX office or connect with Dr. Riegel via telehealth, the experience is personalized and attentive from day one.

Your initial consultation is a comprehensive evaluation lasting significantly longer than a typical doctor's visit. Dr. Riegel listens carefully to your symptoms, reviews your medical and family history, discusses your goals and concerns, and begins forming a picture of your hormonal status. He then orders the extensive laboratory panel necessary to confirm his clinical assessment and guide your treatment design.

Once your lab results are available, Dr. Riegel reviews them in detail, designs your personalized protocol, and discusses his findings and recommendations with you. He explains what your lab results mean, which hormones need to be addressed, and how his proposed treatment plan will work. Patient education is central to his approach because informed patients are more engaged, more compliant, and ultimately more successful in their treatment.

Your customized bioidentical hormone prescription is then prepared and delivered to you. Dr. Riegel provides clear instructions on administration and schedules your follow-up appointments. Most patients have their first follow-up lab work performed four to six weeks after starting therapy, with subsequent testing at regular intervals to ensure optimal progress.

Throughout your treatment, Dr. Riegel remains accessible and engaged. Protocol adjustments are made based on lab data and your subjective experience, and you are never left wondering whether your treatment is on track. This level of attentive, expert oversight is what produces consistently excellent outcomes for The Riegel Center's patients.