Testosterone
26 articles
Tier 1 · TestosteroneScrotal Heat Exposure Lowers Sperm Count but Not Testosterone
Prolonged scrotal heat reduces sperm count by up to 32% without affecting testosterone levels. Cooling strategies reverse damage in 3 months.
Tier 1 · TestosteroneOptimizing Testosterone Cypionate Dosing: Weekly vs. Biweekly Pharmacokinetics
Biweekly testosterone cypionate injections cause significant hormone fluctuations, increasing symptom variability and side effect risk.
Tier 1 · TestosteroneDietary Cholesterol and Fat Intake: Impact on Male Testosterone Synthesis
Dietary cholesterol is the precursor for testosterone.
Tier 1 · TestosteroneHIIT vs. Steady-State Cardio: Testosterone and Cortisol Tradeoffs
HIIT acutely boosts testosterone more than steady-state cardio, yet this immediate surge does not reliably translate to chronic increases.
Tier 1 · TestosteroneOvertraining Syndrome: HPTA Axis Disruption, Testosterone Suppression, and Recovery
Overtraining syndrome disrupts the HPTA axis, suppressing testosterone and elevating cortisol.
Tier 1 · TestosteroneSlow-Wave Sleep and Testosterone: Why NREM Stage 3 Matters More Than Total Sleep Duration
Testosterone surges during slow-wave sleep, not total sleep time. Disrupting NREM stage 3 cuts overnight T production by up to 50%.
Tier 2 · TestosteroneHypogonadism in Men: Diagnosis, Thresholds, and When to Treat
Hypogonadism requires low testosterone confirmed on two morning draws plus symptoms. Primary and secondary forms have different causes and workups.
Tier 1 · TestosteroneMale Fertility and Sperm Health: What the Evidence Shows
Male factor contributes to 50% of infertility cases. Sperm parameters, what degrades them, and what lifestyle and supplement evidence supports improvement.
Tier 1 · TestosteroneVitamin D Supplementation Does Not Consistently Raise Testosterone in Men
Randomized controlled trials and two meta-analyses show vitamin D supplementation does not raise testosterone, even in deficient men.
Tier 1 · TestosteroneSleep Apnea and Testosterone: How OSA Suppresses Male Hormones
Obstructive sleep apnea reduces testosterone through sleep fragmentation and hypoxia. CPAP treatment partially reverses the hormonal deficit.
Tier 1 · TestosteroneTestosterone and Heart Health: What the Evidence Actually Shows
Testosterone's cardiovascular effects have been debated for decades. Recent large trials clarify the risk profile of TRT for men with hypogonadism.
Tier 1 · TestosteroneVaricocele and Testosterone: What the Evidence Shows
Varicocele affects 15% of men and up to 40% of men with infertility. Its effects on testosterone and fertility are real and often reversible with treatment.
Tier 1 · TestosteroneEstrogen in Men: What It Does, When It's Too High, and How to Balance It
Men need estrogen — but too much impairs testosterone, causes gynecomastia, and suppresses libido. Here's the complete picture of estrogen in male health.
Tier 1 · TestosteroneLow Libido in Men: Causes, Diagnosis, and Evidence-Based Treatment
Low libido in men is rarely a single-cause problem. Understanding the overlapping hormonal, psychological, and lifestyle factors is the first step to fixing it.
Tier 1 · TestosteroneGLP-1 Medications and Testosterone: What Happens to Hormones on Ozempic
GLP-1 medications like Ozempic cause significant weight loss. Here's what the emerging evidence shows about their effects on testosterone and male hormones.
Tier 1 · TestosteroneHow Alcohol Lowers Testosterone: Mechanisms and Dose Thresholds
Alcohol suppresses testosterone through multiple pathways. The research reveals clear dose thresholds — and one surprising finding about low-dose drinking.
Tier 1 · TestosteroneCold Exposure and Testosterone: Separating Signal from Hype
Cold plunges are everywhere on men's health social media. The actual clinical evidence on cold exposure and testosterone is more nuanced than the hype suggests.
Tier 1 · TestosteroneHIIT and Testosterone: The Optimal Protocol Based on Clinical Evidence
High-intensity interval training produces larger acute testosterone spikes than steady-state cardio. Here's the exact protocol parameters the evidence supports.
Tier 1 · TestosteroneIntermittent Fasting and Testosterone: What the Research Actually Shows
Short fasting windows may support testosterone. Extended fasting suppresses it. The research is more nuanced than IF advocates claim.
Tier 1 · TestosteroneTestosterone Through the Decades: What's Normal, What's Not, and What You Can Do
Testosterone peaks at 20, drops 1-2% per year after 30. But the decline is not fixed — lifestyle choices each decade shape how far and fast it falls.
Tier 1 · TestosteroneBody Composition and Testosterone: The Fat-Muscle-Hormone Triangle
Body fat and testosterone have a bidirectional relationship via aromatase. Understanding this cycle explains why fat loss beats supplements for testosterone.
Tier 1 · TestosteroneResistance Training for Testosterone: What the Research Says About Sets, Reps, and Rest
Compound movements, moderate rest, and progressive overload produce the largest hormonal adaptations. The specific training variables that matter.
Tier 1 · TestosteroneChronic Stress, Cortisol, and Testosterone: The Hormonal Conflict
Cortisol and testosterone compete for pregnenolone. Chronic stress redirects steroidogenesis away from testosterone — here is the mechanism and the evidence.
Tier 1 · TestosteroneSleep and Testosterone: The Recovery Protocol That Actually Works
One week of five-hour nights drops testosterone by 10-15%. The recovery protocol is specific, measurable, and more effective than any supplement.
Tier 2 · TestosteroneHow to Read Your Testosterone Lab Results
Total testosterone alone is incomplete. Free testosterone, SHBG, LH, and FSH together tell the story. Here is what each number means and what to do with it.
Tier 1 · TestosteroneTestosterone Optimization: The Evidence-Based Lifestyle Protocol
Sleep, resistance training, body composition and micronutrients each have dose-response relationships with testosterone. Here is what the data shows.