Men's Hormone Health

Low Testosterone

Low testosterone saps energy, drive, and vitality — and it's far more common than most men realize. Properly diagnosed, it's also very treatable.

  • Also calledLow T, hypogonadism
  • Hallmark labsLow total & free testosterone
  • Common driversAge, weight, metabolic health
  • Treatable?Yes — with supervised TRT

What low testosterone is

Testosterone is the primary male hormone, governing libido, energy, muscle, mood, and drive. When levels fall below a healthy range — a condition called hypogonadism — men often notice a steady decline in how they feel and function. Levels naturally dip with age, but weight gain, metabolic conditions, certain medications, and other factors can accelerate the drop.

How low testosterone shows up

The most common symptoms are low libido, persistent fatigue, reduced motivation, difficulty building or keeping muscle, increased body fat, low mood, and trouble concentrating. Because these creep in gradually and overlap with stress and aging, low T is frequently missed. We cover the full picture on our low testosterone symptoms page.

How it's diagnosed

Diagnosis requires blood work — typically total and free testosterone drawn in the morning when levels peak, often confirmed on a second test, plus related markers. We interpret results against your symptoms, not just the lab range. See our TRT monitoring & labs page for what we measure and why.

How low testosterone is treated

When low T is confirmed and symptomatic, testosterone replacement therapy restores levels to a healthy range. There are several delivery methods, each with trade-offs — we match the option to your goals and lifestyle on our TRT treatment options page, and monitor closely for safety.

Frequently Asked Questions

What is considered low testosterone?
There's a reference range, but the diagnosis combines below-range testosterone on morning blood tests with consistent symptoms. We treat the man, not just the number — a borderline level with clear symptoms is interpreted differently than the same value in someone who feels great.
Is low testosterone just a normal part of aging?
Levels do decline with age, but that doesn't mean symptoms must be ignored. If low T is affecting your energy, libido, or quality of life, it's worth evaluating and, if appropriate, treating.
Will treating low T help with weight and energy?
Restoring testosterone often improves energy, motivation, and the ability to build muscle and lose fat. It works best alongside healthy lifestyle changes, not as a substitute for them.
Does TRT affect fertility?
Standard testosterone therapy can reduce sperm production. If fertility is a priority, tell your clinician — there are alternative approaches and protocols to discuss.
Can low testosterone be treated by telehealth?
Yes — we order labs locally, review them with you by video, and manage therapy statewide across California, plus in person in Chatsworth and Santa Barbara.
Do you treat women's low testosterone too?
Yes, but through a different protocol — see our testosterone therapy for women page under bioidentical hormone care. This page focuses on men's TRT.

Clinical references: Endocrine Society · American Urological Association

Related TRT Care

Get Your
Edge Back.

If your energy, drive, or libido have faded, low testosterone may be the reason. Book a consultation and we'll test properly and build a plan that fits you.

Available across California via telehealth · in-person in Chatsworth & Santa Barbara.

Medically reviewed by Carolyn Pampalone, MSN, FNP-BC · Last reviewed October 2026