DR. AREN NILSSON
The 63 ng/dL Wake-Up Call: Why Every Man Should Get His Hormones Checked
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Root-Cause MedicineJanuary 2026·10 min read

The 63 ng/dL Wake-Up Call: Why Every Man Should Get His Hormones Checked

I Was 19 Years Old With the Testosterone of a Dying Man

I want you to imagine something. You're 19. You should be at the peak of your biological life. Energy through the roof, sharp as a razor, ready to take on the world. Instead, you wake up every morning feeling like you're underwater. Your brain won't cooperate. Your body won't cooperate. You can't focus. You can't remember things. You have zero motivation and you don't know why.

That was me.

Not in a "college kid who stays up too late playing video games" kind of way. In a clinical, something-is-deeply-wrong kind of way. I was sleeping 10 hours a night and waking up exhausted. I couldn't retain information no matter how hard I studied. I had no drive, no ambition, no fire. And the scariest part: I had no explanation.

If you'd met me during that period, you might have thought I was depressed. And honestly, I thought I was too. The symptoms looked identical. Brain fog. Fatigue. Irritability. Loss of interest in things I used to care about. A vague sense that something was wrong but no idea what.

The Number That Changed Everything

I got blood work done. Not because anyone told me to. Not because a doctor suggested it. I got it done because I was desperate. I had been obese as a child, lost 75 pounds through sheer discipline as a teenager, and I knew what it felt like to be in control of my body. This wasn't that. This was something else entirely.

When the results came back, my total testosterone was 63 ng/dL.

Let me put that in context for you. The normal reference range for adult males is roughly 300 to 1,100 ng/dL. The average 85-year-old man has a testosterone level around 200-300 ng/dL. I was at 63. At nineteen years old.

I wasn't depressed. I was hormonally castrated.

What Low Testosterone Actually Does to You

Most people think testosterone is just about muscles and sex drive. It's not. Testosterone is one of the most important hormones in the male body, and it affects virtually every system you have.

Cognitive function. Testosterone is critical for memory, focus, and mental clarity. Low T is directly associated with brain fog, poor concentration, and reduced cognitive processing speed. This isn't subjective. It's measurable on neuropsych testing.

Mood and motivation. Testosterone modulates dopamine pathways. When your testosterone is in the gutter, your dopamine signaling is compromised. That means reduced motivation, reduced drive, and a flat emotional landscape that looks and feels exactly like depression.

Energy metabolism. Testosterone plays a direct role in mitochondrial function and cellular energy production. Low T means your cells literally cannot produce energy efficiently. You're not lazy. Your cells are starving.

Body composition. Without adequate testosterone, you accumulate visceral fat and lose lean muscle mass, regardless of how well you eat or train. This creates a vicious cycle because adipose tissue converts testosterone to estrogen via aromatase, making the problem progressively worse.

Cardiovascular health. Testosterone is cardioprotective. Low levels are associated with increased cardiovascular risk, elevated inflammatory markers, and endothelial dysfunction.

At 63 ng/dL, I wasn't just experiencing one of these problems. I was experiencing all of them simultaneously. My entire physiology was running on fumes.

What the Medical System Would Have Done

Here's what keeps me up at night. If I had walked into a primary care office at 19 and described my symptoms: fatigue, brain fog, no motivation, feeling flat, difficulty concentrating... what do you think they would have done?

They would have diagnosed me with depression and handed me an SSRI.

Not because they're bad doctors. Because the system is built to match symptoms to diagnoses and diagnoses to prescriptions. There is no step in the standard workflow that says "check this 19-year-old's testosterone." It's not part of the algorithm. It's not what they were trained to do.

And if they had checked my testosterone, there's a decent chance they would have looked at the lab's reference range, seen that some labs list the "normal" range as low as 250 or even 200 ng/dL, and told me I was "within normal limits."

Within normal limits. At 63 ng/dL. At 19 years old.

This is not a failure of individual doctors. This is a systemic failure of how we practice medicine in this country. We've built a system that's optimized for acute care and pharmaceutical intervention, and it is fundamentally incapable of identifying root causes when the root cause doesn't fit neatly into a diagnostic code.

Testosterone Replacement Changed My Life

I started testosterone replacement therapy. Within weeks, the fog began to lift. Within months, I was a different person.

Not a different person in some abstract, motivational-poster way. Measurably, observably different in every domain of my life.

I went from barely functioning to becoming the president of Phi Beta Lambda at the University of South Florida. I went from having no drive to winning Rookie of the Year at Vivint, one of the most competitive sales organizations in the country. I went from struggling to retain basic information to excelling academically.

Same brain. Same body. Different hormonal environment.

That's the part people need to understand. TRT didn't give me abilities I didn't have. It restored the biological infrastructure that allowed my existing abilities to actually express themselves. I wasn't lacking talent or discipline or intelligence. I was lacking the fundamental hormonal substrate that makes all of those things possible.

The Epidemic Nobody's Talking About

My story is dramatic because my levels were so extreme. But here's the thing: I'm not an outlier in direction. Only in degree.

Testosterone levels in American men have been declining for decades. A 2007 study in the Journal of Clinical Endocrinology & Metabolism found that average testosterone levels dropped by roughly 1% per year from 1987 to 2004, independent of age. That means a 30-year-old man today has significantly lower testosterone than a 30-year-old man in 1990.

The causes are multifactorial. Endocrine disruptors in plastics, pesticides, and water supplies. Chronic stress driving cortisol-mediated suppression of the HPG axis. Poor sleep. Sedentary lifestyles. Processed food. Obesity, which creates that aromatase-driven conversion cycle I mentioned.

Millions of men are walking around with suboptimal testosterone and they have no idea. They've been told they're depressed, anxious, burned out, or just getting older. They've been given SSRIs, benzodiazepines, or the classic advice to "exercise more and reduce stress." Nobody checked their hormones.

What You Should Actually Get Tested

If any of what I've described resonates with you, get your blood work done. Not a basic metabolic panel. Not a CBC. A comprehensive hormone panel. Here's what you should demand:

Total Testosterone. This is the headline number, but it's not the whole story.

Free Testosterone. This is the bioavailable fraction that actually interacts with androgen receptors. You can have "normal" total T and still be symptomatic if your free T is low.

SHBG (Sex Hormone-Binding Globulin). This protein binds to testosterone and makes it unavailable. High SHBG means less free T even if your total looks fine.

Estradiol (E2). Estrogen in men. If this is elevated relative to testosterone, you'll have symptoms regardless of your T level.

LH and FSH. These pituitary hormones tell you whether the problem is in your brain (secondary hypogonadism) or your testes (primary hypogonadism). This distinction matters for treatment.

DHEA-S. An adrenal androgen precursor. Gives you information about adrenal function and overall androgen status.

Thyroid Panel (TSH, Free T3, Free T4). Because thyroid dysfunction mimics many of the same symptoms and the two systems interact.

Prolactin. Elevated prolactin can suppress testosterone production and may indicate a pituitary issue.

Get tested in the morning, fasted. Testosterone peaks in the early morning hours and declines throughout the day. An afternoon draw can give you an artificially low number.

And for the love of everything: don't let anyone tell you that your levels are "normal" just because they fall within some arbitrary lab reference range. Reference ranges are population averages, not optimal ranges. There's a massive difference between "not clinically deficient" and "functioning at your best."

The Conversation We Need to Have

I've been on TRT for over 15 years now. It didn't just change my health. It changed the entire trajectory of my life. Every business I've built, every degree I've earned, every patient I've helped: none of it happens without that intervention.

And it almost didn't happen at all.

If I had been slightly less stubborn, slightly less willing to question the system, slightly more trusting of a doctor who would have handed me Lexapro and sent me on my way... I would have spent years, maybe decades, medicating symptoms of a hormone deficiency that a $150 blood test could have identified.

That's not okay.

Men need to stop accepting "you're fine" as an answer when they know they're not fine. Doctors need to start checking hormones before they reach for the prescription pad. And the medical system needs to acknowledge that its reference ranges and its protocols are failing an entire generation of men.

Your hormones are not a luxury concern. They are the foundation of your physical health, your mental health, your cognitive performance, and your quality of life. If the foundation is cracked, nothing you build on top of it will stand.

Get your blood work done. Get a full panel. Find a provider who understands optimization, not just disease management. Your life might depend on it.

Mine did.

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