Can Vitamin D impact testosterone?
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Oct 28, 2025 · 14 min read
Vitamin D can modestly raise testosterone in men who are truly vitamin D–deficient (25‑hydroxyvitamin D
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Dr. Susan Carter is an endocrinologist and longevity expert specializing in hormone balance, metabolism, and the aging process. She links low testosterone with thyroid and cortisol patterns and turns lab data into clear next steps. Patients appreciate her straightforward approach, preventive mindset, and calm, data-driven care.
Estrogen in men: Low Estradiol can ruin your TRT therapy
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Oct 26, 2025 · 13 min read
Low estradiol can derail TRT even when testosterone looks “normal,” because aromatase converts testosterone into estradiol and symptoms often appear when estradiol falls below about 20 pg/mL. Learn the key signs, the right lab test to order, and how to fix low E2 without crashing your hormones. “Men often think estrogen is the enemy, but ...
Top 5 natural ways to increase testosterone
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Oct 18, 2025 · 13 min read
Weight loss, better sleep, smarter training, stress control, and fixing silent medical problems are the top 5 natural ways to increase testosterone. Here is how they work and how to build a practical plan with lab numbers that actually mean something. “Start with the basics. Lose excess weight, protect your sleep, train your muscles, and ...
5 testosterone side effects you must be aware of
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Oct 14, 2025 · 15 min read
Testosterone replacement commonly causes a 2–5 mmHg rise in blood pressure, can thicken blood via erythrocytosis (hematocrit may climb to ≥54%), may suppress sperm production and fertility, can increase oily skin/acne, and can worsen obstructive sleep apnea. Tracking blood pressure, hematocrit, and symptoms from day one helps you and your clinician adjust dose or formulation ...
Unexpected effects of testosterone therapy you should know
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Aug 23, 2025 · 15 min read
Testosterone therapy can cause “unexpected” side effects beyond libido and muscle gains, including bone-marrow–driven rises in hemoglobin/hematocrit that can reach erythrocytosis when hematocrit exceeds ~54%, along with water retention, acne, mood changes, and reduced fertility. Here’s what to monitor, why these effects happen, and how to manage them safely with your clinician. “Testosterone can be ...