Hormone Wellness

Estrogen and progesterone are the primary female sex hormones, produced mainly by the ovaries. They work in concert to regulate the menstrual cycle, support bone density, maintain cardiovascular health, protect cognitive function, and influence mood, sleep, and skin quality.

Their decline — which begins in perimenopause, typically in the early-to-mid 40s, well before the final menstrual period — is responsible for one of the most significant hormonal transitions a woman's body undergoes. Symptoms can include irregular cycles, sleep disruption, hot flashes, brain fog, mood changes, vaginal dryness, joint pain, and accelerating changes in body composition.

Estrogen dominance — a relative excess of estrogen compared to progesterone — is a separate and commonly overlooked pattern that can cause symptoms including heavy periods, bloating, mood swings, and increased breast tissue sensitivity, often in women who are still cycling regularly.

Hormone Replacement Therapy (HRT) has undergone a significant reassessment in recent years. A 2002 Women's Health Initiative study triggered widespread abandonment of HRT based on findings that have since been significantly recontextualized — particularly regarding timing, type of hormone, and delivery method. The current clinical consensus, supported by major menopause societies, is that for most healthy women under 60 or within ten years of menopause onset, the benefits of HRT meaningfully outweigh the risks.

Testosterone is the primary androgen, produced by the testes in men and in smaller amounts by the ovaries and adrenal glands in women. It plays a central role in muscle mass, bone density, libido, energy, mood, cognitive function, and metabolic health across genders.

In men, testosterone declines gradually from the late 20s onward — approximately 1% per year. Low testosterone (hypogonadism) is associated with fatigue, reduced muscle mass, increased body fat, mood changes, cognitive decline, and cardiovascular risk. Testosterone Replacement Therapy (TRT) is an established and widely used treatment, available through clinicians and a growing ecosystem of telehealth platforms.

In women, testosterone is far less discussed but equally important. Women produce testosterone throughout their lives, and declining levels — particularly around perimenopause — contribute to fatigue, reduced libido, loss of muscle tone, mood changes, and cognitive symptoms. Low-dose testosterone therapy for women is an active and growing area of clinical practice, though it remains underutilized relative to its evidence base.

The thyroid gland produces two primary hormones — T4 (thyroxine) and T3 (triiodothyronine) — that regulate metabolism, energy production, body temperature, heart rate, digestion, and cognitive function. T4 is the inactive form; T3 is the active form that cells actually use.

Thyroid dysfunction is among the most common hormonal conditions, affecting an estimated 20 million Americans — the majority of them women. Yet standard medical care often relies on TSH alone as a thyroid screening tool, missing a significant portion of clinically relevant dysfunction.

Cortisol is produced by the adrenal glands in response to stress — physical, emotional, or metabolic. In appropriate amounts and patterns, cortisol is essential: it regulates blood sugar, modulates inflammation, supports immune function, and follows a natural diurnal rhythm that supports energy in the morning and wind-down at night.

Chronic stress disrupts this rhythm. Persistently elevated cortisol is associated with sleep disruption, weight gain particularly around the abdomen, immune suppression, hormonal imbalance, and accelerated aging. Conversely, patterns sometimes described as "adrenal fatigue" — though not a formally recognized diagnosis — involve dysregulated cortisol patterns that leave people feeling exhausted, wired-but-tired, and unable to recover from stress.

DHEA-S — produced alongside cortisol by the adrenal glands — is a precursor to both estrogen and testosterone and declines significantly with age. It is a useful marker of adrenal function and overall hormonal vitality and is frequently assessed alongside cortisol in functional hormone panels.

Insulin, produced by the pancreas, regulates blood sugar by signaling cells to absorb glucose from the bloodstream. Insulin resistance — where cells become less responsive to insulin's signal — is one of the most prevalent and consequential hormonal dysfunctions in modern health, driving type 2 diabetes, cardiovascular disease, hormonal imbalance, and accelerated aging.

Insulin resistance frequently develops silently over years. Fasting insulin — rarely included in standard panels — is one of the earliest detectable markers, often elevated long before fasting glucose or HbA1c becomes abnormal.

The connection between insulin and other hormonal systems is significant: insulin resistance directly affects testosterone, estrogen, thyroid function, and cortisol. Addressing metabolic hormonal health is frequently a prerequisite for optimizing other hormone systems.

Growth hormone (GH), produced by the pituitary gland, supports muscle maintenance, fat metabolism, tissue repair, sleep quality, and immune function. Its production declines significantly with age — one of the most consistent features of biological aging.

IGF-1 (insulin-like growth factor 1) is produced primarily by the liver in response to growth hormone and is the primary marker used to assess growth hormone activity in clinical settings. Optimizing growth hormone levels — through sleep, exercise, nutrition, and when appropriate, growth hormone secretagogues (covered in the peptides category) — is a central focus of many longevity programs.