Testosterone Levels

Testosterone is the key male sex hormone and plays an important role in erectile health. It influences libido, nocturnal erections, nitric oxide synthase activity, and vascular responsiveness. Low testosterone does not necessarily prevent daytime erections in the short term, but it reduces the frequency and quality of nocturnal erections. These erections are critical for keeping erectile tissue oxygenated and healthy. Without this nightly “maintenance,” erectile capacity can decline over time. Optimising lifestyle is the first step, but in some men, medical evaluation and treatment are required.

You may want to explore testosterone further if you notice:

• Low libido or reduced sexual thoughts.
  
  
• Fewer or weaker morning erections (a reflection of nocturnal erections).
  
  
• Fatigue, low mood, or reduced drive.
  
  
• Loss of muscle mass or increased abdominal fat.
  
  
• Difficulty recovering from exercise.
  
  
• Lab tests showing low or borderline testosterone.
  
  

⚠️ If you suspect low testosterone, consult a doctor. Proper testing requires two separate morning total testosterone measurements, ideally with free testosterone and related hormones (LH, FSH, prolactin) to identify the cause.

• Libido and arousal: Testosterone drives desire, which primes the erectile response.
  
  
• Nocturnal erections: Adequate testosterone is required for the spontaneous erections during REM sleep that keep penile tissue healthy. Loss of these is an early marker of hormonal decline.
  
  
• Daytime erections: In the short term, many men can still achieve erections during sexual activity despite low testosterone, especially if vascular and neural pathways are intact.
  
  
• Long-term tissue health: Without regular nocturnal erections, oxygen supply to penile tissue decreases, leading to gradual structural changes.
  
  
• Nitric oxide synthase: Testosterone upregulates eNOS, supporting nitric oxide release.
  
  
• Body composition: Low testosterone increases fat mass and reduces muscle, which worsens metabolic and vascular health.

• TRT should only be prescribed by a clinician.
  
• Contraindications: prostate or breast cancer, untreated severe sleep apnea, high hematocrit.
  
• Fertility: TRT suppresses sperm production; alternatives may be required in younger men.

Optimise lifestyle first.

• Sleep: 7–9 hours/night; fragmented sleep lowers testosterone secretion.
• Exercise: Resistance + aerobic training maintain testosterone and reduce visceral fat.
• Nutrition: Protein, healthy fats (olive oil, nuts, omega-3s), vitamin D, zinc, magnesium.
• Weight management: Reducing visceral fat helps restore testosterone.
  

Manage stress.
Chronic stress elevates cortisol, which suppresses testosterone.

Monitor levels.
If symptomatic, test morning testosterone twice. Include free T and other hormones if available.

Medical options (if indicated).

• TRT (testosterone replacement therapy): Considered if levels are consistently low with persistent symptoms.
• Must be supervised medically (hematocrit, PSA, fertility considerations).

• Confusing cause and effect: Daytime erection changes may stem from vascular issues even if testosterone is normal.
  
• Self-diagnosis: Fatigue or low mood are not always hormonal.
  
• “Test boosters”: Most over-the-counter supplements lack strong evidence.
  
• Ignoring underlying drivers: Sleep apnea, diabetes, thyroid disease can all reduce testosterone.

Low testosterone doesn’t always block daytime erections right away, but it reduces nocturnal erections - the body’s natural way of keeping erectile tissue healthy. Over time, this can compromise erectile capacity. Supporting testosterone through lifestyle, and seeking medical advice if levels remain low, helps preserve long-term erectile health.