Hormone Replacement Therapy: A Brief Review

Understanding Hormones and the Aging Process

As we age, our bodies undergo gradual changes in cellular repair, regeneration, metabolism, and hormone production. Some decline in function is a natural part of aging, but the rate and extent of these changes vary considerably from person to person.

Many factors influence the aging process, including genetics, environmental exposures, tobacco and alcohol use, nutrition, physical activity, chronic stress, sleep, and acute or chronic disease. Understanding these factors is an important part of developing an individualized approach to health and wellness.

Hormone production also changes with age. In some individuals, lifestyle modifications and targeted therapies may help support normal hormone production and function. In others, age-related changes or underlying medical conditions may result in hormone deficiencies that warrant consideration of hormone replacement therapy (HRT).

The appropriate approach depends on the individual, their symptoms, laboratory findings, medical history, and treatment goals. There is no single strategy that works for everyone.

Sometimes the body can be supported in restoring its own function; other times, replacing a deficient hormone may be appropriate.

A Brief Review of Hormones

Hormones are chemical messengers produced by various organs and tissues, including the ovaries, testes, adrenal glands, thyroid, and pancreas. They help regulate numerous physiological processes throughout the body.

Some important functions of hormones include:

• Growth and development of tissues, including the brain, heart, and muscles
• Cellular maintenance and tissue repair
• Metabolism of carbohydrates, fats, and proteins
• Sexual function and reproductive health
• Cognitive function, mood, and sleep
• Regulation of body temperature, thirst, and fluid balance
• Bone health and maintenance of muscle mass

Although many hormones contribute to these processes, this article focuses primarily on three sex hormones:estrogen, progesterone, and testosterone.Other hormones, including human growth hormone (HGH) and insulin-like growth factor 1 (IGF-1), also influence metabolism, growth, and tissue function.

Understanding Hormone Therapy Terminology

Several terms are commonly used when discussing hormone therapy. Understanding their differences can help patients make informed decisions about treatment.

Hormone Therapy (HT)

A general term for treatment involving hormones to address a deficiency, manage symptoms, or treat a medical condition.

Hormone Replacement Therapy (HRT)

Treatment that provides hormones from an external source to replace or supplement hormones produced by the body.

Hormone Support

An informal term for approaches intended to support normal hormone production or function. Depending on the intervention, this may include nutritional strategies, lifestyle changes, or selected medications and supplements. The effectiveness of these approaches depends on the underlying cause of the hormone imbalance.

Bioidentical Hormones

Bioidentical hormones have the same chemical structure as hormones produced naturally by the human body. Examples include estradiol, progesterone, and testosterone.

Importantly, bioidentical hormones are not necessarily natural, safer, or more effective simply because their chemical structures match those made by the body. Some are available in FDA-approved medications, while others are prepared by compounding pharmacies.

Bioidentical Hormone Replacement Therapy (BHRT)

BHRT refers to hormone replacement using bioidentical hormones. Treatment may involve FDA-approved products or custom-compounded preparations. These options differ in their regulatory oversight, available formulations, and supporting safety and efficacy evidence.

Synthetic Hormones and Progestins

Some hormone medications have chemical structures that differ from naturally occurring human hormones. For example, medroxyprogesterone acetate (Provera) is a synthetic progestin, whereas micronized progesterone has the same chemical structure as human progesterone.

These compounds can have different physiological effects and risk profiles. However, the safety of any hormone therapy depends on the specific medication, dose, route of administration, duration of use, and individual patient characteristics.

What Does the Research Say About Hormones and Breast Cancer Risk?

Hormone therapy and breast cancer risk are complex topics. Research has shown that risks can differ depending on the hormones used and whether estrogen is taken alone or combined with a progestogen.

For example, findings from the Women's Health Initiative (WHI) trials differed between women taking conjugated equine estrogens alone and women taking conjugated equine estrogens combined with medroxyprogesterone acetate. These findings cannot automatically be applied to every hormone formulation or treatment regimen.

Observational studies have also suggested that micronized progesterone may have a different breast cancer risk profile from certain synthetic progestins. However, these findings do not establish that all bioidentical hormone regimens are risk-free or that they prevent breast cancer.

The most appropriate approach is to evaluate the evidence for the specific hormone regimen being considered and discuss its potential benefits and risks with a qualified healthcare professional.

BHRT for Menopause and Age-Related Hormone Changes

Hormone therapy may be appropriate for some women experiencing menopausal symptoms and for some men with clinically confirmed testosterone deficiency. Treatment decisions should be based on symptoms, appropriate clinical evaluation, medical history, laboratory findings when indicated, and an individualized assessment of risks and benefits.

Common Symptoms of Menopause

• Hot flashes and night sweats
• Sleep disturbances
• Mood changes or irritability
• Vaginal dryness and discomfort
• Changes in sexual function or libido
• Difficulty concentrating or memory complaints
• Fatigue

These symptoms may have multiple contributing factors, and not all are caused by low estrogen.

Common Symptoms Associated With Low Testosterone in Men

• Reduced libido
• Erectile dysfunction
• Fatigue or reduced stamina
• Decreased muscle mass and strength
• Reduced bone density
• Mood changes or difficulty concentrating
• Changes in body composition

Gynecomastia (enlargement of breast tissue in men) can also occur, but it has several possible causes and is not a typical indicator of testosterone deficiency by itself.

The termandropauseis sometimes used to describe age-related changes in male hormones. Unlike menopause, however, testosterone levels generally decline gradually, and not all men develop clinically significant testosterone deficiency.

It is important to investigate other possible causes of these symptoms rather than assuming that hormone replacement is the appropriate treatment.

Can Blood Tests Assess My Hormones?

Blood testing is often a useful starting point when evaluating hormone status. Depending on the patient and clinical question, testing may include estradiol, progesterone, total and free testosterone, sex hormone-binding globulin (SHBG), and other relevant markers.

However,hormone testing should be selected and interpreted in the context of the patient's symptoms, medical history, and treatment regimen.A single laboratory result does not always reflect hormone activity at the tissue level or establish the need for treatment.

For example, estradiol (E2) is one of three major forms of estrogen found in the body. The other two are estrone (E1) and estriol (E3). Their relative concentrations vary with age, reproductive status, and other factors. Measuring all three is not routinely necessary for every patient, but additional testing may be useful in selected clinical circumstances.

Testosterone can also be converted into dihydrotestosterone (DHT), a more potent androgen that contributes to certain effects, including facial and body hair growth and prostate physiology. Elevated androgen activity may contribute to acne or scalp hair loss in susceptible individuals. DHT testing may be considered when clinically indicated, although it is not required for every patient receiving testosterone therapy.

Other laboratory markers may be appropriate depending on the treatment. For example, monitoring may include blood counts, liver function, lipid levels, prostate-specific antigen (PSA), or other tests based on the patient's age, medical history, medications, and individual risk factors.

The goal is not simply to measure hormone levels, but to evaluate whether treatment is appropriate, effective, and safe.

Are Urine and Saliva Testing More Accurate?

Blood, urine, and saliva testing each have specific applications, but no single method is universally the most accurate or reliable for every hormone or clinical situation.

Urinary hormone testing may provide information about hormone metabolites and how hormones are processed by the body. Saliva testing is used in some clinical settings, but its reliability depends on the hormone measured, the testing method, and the clinical question.

It is important to distinguish between measuring a hormone or its metabolites and determining whether a particular treatment is safe or effective. For many patients receiving menopausal hormone therapy, treatment decisions are guided primarily by symptom improvement, side effects, clinical risk factors, and appropriate follow-up. A comprehensive evaluation should use the testing methods best suited to the individual patient and the specific treatment being considered.

Forms of Bioidentical Hormone Therapy

Bioidentical hormones are available in several formulations and routes of administration, depending on the hormone and the clinical indication.

These may include:

• Creams and gels
• Transdermal patches and sprays
• Oral medications
• Vaginal creams, tablets, and other preparations
• Injections
• Other specialized formulations when clinically appropriate

Some bioidentical hormone products are FDA-approved and available through retail pharmacies. Others are custom-prepared by compounding pharmacies when a specific formulation or dose is needed.

What Should I Do Next?

Hormones play important roles in reproductive health, metabolism, bone health, muscle maintenance, and other physiological processes. When symptoms develop or hormone deficiencies are suspected, a thorough evaluation can help determine whether hormone therapy or another treatment approach may be beneficial.

Hormone therapy is not appropriate for everyone, and its potential benefits and risks vary according to the individual and the specific treatment. Decisions should consider age, symptoms, medical history, relevant laboratory findings, treatment goals, and established clinical evidence.

If you are considering hormone therapy, seek a qualified healthcare professional who can explain the available options, discuss the evidence and uncertainties, and develop an individualized monitoring plan.

At Valley Integrative Health, our goal is to help patients understand their health, explore appropriate treatment options, and make informed decisions through a patient-centered approach that integrates naturopathic and conventional medical perspectives.

Contact Valley Integrative Health

Visitwww.VIHclinic.comto learn more about our services or schedule an appointment.

Devin Wilson, NDis a licensed Naturopathic Doctor and owner of Valley Integrative Health, LLC, in Ashland, Oregon. With over a decade of clinical experience, including two years of training with a physician affiliated with Johns Hopkins and Yale, Dr. Wilson integrates naturopathic and modern medical approaches with selected advanced therapies. He has completed additional training in bioidentical hormone therapy and anti-aging medicine. His goal is to help patients re-establish, maintain, and optimize their health through an individualized, patient-centered approach.

Further Reading and Clinical Resources

• The American College of Obstetricians and Gynecologists (ACOG): Compounded Bioidentical Menopausal Hormone Therapy
• The Menopause Society: Hormone Therapy
• The Endocrine Society: Compounded Bioidentical Hormone Therapy