Boost Testosterone Naturally: A 10-Part Blueprint

About This Series

Learn to optimise your testosterone with 10 lessons. This article will go through the science behind testosterone, and how it works; its availability, receptor activity and the whole"testosterone system". We'll go far beyond the "eat more protein and lift heavy" advice that's already out there.

You'll learn:

• How to optimise your HPG axis through sleep architecture and energy availability.
• Understand the effect of different types of exercise on your testosterone levels.
• Manage the cortisol-testosterone relationship.
• Eliminate endocrine disruptors
• Build a sustainable programme to prioritise what actually matters: sleep, body composition, resilience, and good nutrition.

This course is designed for men who feel they're experiencing low energy, decreased libido, or training plateaus due to their lifestyles. It's not for people with clinically low testosterone or testosterone-related diseases.

Contents

1. Your testosterone levels aren’t everything
2. The HPG axis
3. Testosterone is made while you sleep
4. Eat your way to higher testosterone
5. The micronutrients that matter
6. Training for higher testosterone
7. Body fat kills testosterone
8. Stress is a testosterone killer
9. The testosterone suppressors in your environment
10. Your testosterone blueprint summary

Each lesson includes evidence-based information, clear and actionable advice, and simple tracking tools. The expected outcomes for men with a misfiring testosterone system would be measurable improvements in their health, performance, mood and possibly testosterone levels within 3-6 months.

Lesson 1: Your blood testosterone levels aren't everything

Most men think about testosterone in the wrong way. They will fixate on a single blood test number: “total testosterone”.  However, this number doesn't tell the whole story. Testosterone works in a "system", which is made up of three parts. 

1.“Production” (how much you make)

Your Leydig cells in the testes produce roughly 6-7 mg of testosterone a day (in healthy young men). This drop is approximately 1-2% annually after age 30. But despite testosterone decline as we age, it is neither inevitable nor consistent across everyone.

In fact, some men increase their testosterone levels as they age². The production of testosterone depends on signals from your brain, adequate nutrients and testicular health.

2. “Availability” (how much is usable)

Only 2-3% of your testosterone circulates “freely” in blood, meaning it’s not "bound" to anything. This is called “free testosterone”, and it's the biologically active form that enters your cells and does its work. 

Another 40-50% of your testosterone is loosely bound to a protein called “albumin” and becomes available when it's needed. The remaining 50-60% of the testosterone in your blood is tightly bound to a protein called sex hormone-binding globulin (SHBG) and is effectively locked away — it doesn’t work, your cells can't use it, it’s not “bioactive”.

A critical point: You can have “normal” total testosterone levels but low free testosterone (or "bioactive" testosterone) levels if too much of it is bound to SHBG.

Conversely, someone with low-ish total testosterone levels but normal free testosterone levels will have a normally functioning testosterone system, even though their blood (total) testosterone levels are low. Obesity, some other diseases, inflammation and ageing all reduce your testosterone (and free testosterone) levels³.

3. “Receptor activity” (how well your cells respond)

Even with adequate testosterone production and availability, testosterone must then go on to bind to androgen receptors (AR) inside your cells to exert its effects.

The “density” and sensitivity of these receptors vary between different parts of your body and different people. The number of androgen receptors you have can also change in response to exercise, nutrition, body composition and your environment. 

Why the whole testosterone system matters

Two men can have identical total testosterone levels in their blood (e.g., 500 ng/dL) but very different functioning testosterone systems. For example:

• Man [A]: Has low or normal SHBG, high free testosterone, and a normal amount of functional androgen receptors, so he feels energetic, builds muscle pretty easily, has a normal to high libido, and a stable mood.
• Man [B]: Has high SHBG, low free testosterone, and poorly functioning androgen receptors, so will feel fatigued, carry too much fat, have low drive and motivation, and reduced ability to recover from exercise.

The blood test shows the same number, but their testosterone systems function completely differently. Over the next nine lessons, we'll look at how to optimise each of these three parts of your testosterone system: production, availability and androgen receptor signalling.

Tasks

1. Measure your body weight and waist circumference. 
2. Rate the following on a scale of 1-10 for the next 3 days and take an average. We'll use this as a baseline.
   1. Energy/drive first thing in the morning
   2. How well you train or perform if/when you exercise
   3. Your libido/sex drive
   4. Mood
   5. How stressed you are or feel
   6. Your mental clarity and cognitive performance
   7. How you slept (both how long and how well).

Lesson 2: The HPG axis

Testosterone production doesn't start in your balls ("testes" or "gonads"). It starts in your brain. Specifically, in a pea-sized region of your hypothalamus, which is the testosterone command centre of your brain. Most of the testosterone-killing mistakes happen here, in your “hypothalamic-pituitary-gonadal” (HPG) axis — not in your gonads.

How the HPG axis works

Your hypothalamus monitors your body's energy reserves, your stress levels, inflammation, and your current testosterone levels.

When these are good, and your testosterone starts to drop, it sends a "signal" to your pituitary gland (gonadotropin-releasing hormone), which in turn sends a signal to tell your gonads (luteinizing hormone and follicle-stimulating hormone) to start producing more testosterone. 

When testosterone starts rising in your blood, your hypothalamus detects this and then tells your gonads to stop producing it. This prevents overproduction of testosterone. Your HPG axis is highly sensitive. When it detects “danger” (whether real or not), it suppresses your testosterone production to save energy. 

What is a “danger” to your HPG axis⁴

1. Calorie Deficits: Significant calorie deficits decrease your testosterone levels and increase SHBG, further reducing your free testosterone levels.
2. Sleep deprivation: Decreases your testosterone levels, as most of your testosterone is produced while you’re sleeping.
3. Long-term stress: Activates areas in your brain to produce cortisol, which suppresses HPG axis testosterone signalling in your brain (not your gonads). 
4. Long-term inflammation: Certain inflammatory substances that are elevated if you’re obese, have a poor diet, have some diseases or are ill, which go on to suppress your HPG axis and testosterone production. 
5. Excessive exercise: Some exercise can boost your testosterone levels. But too much exercise (sometimes referred to as “overtraining syndrome”) can disrupt your HPG axis, decreasing your testosterone levels.

Task: Avoid suppressing your HPG system

1. Are you eating enough? Compare what you're actually eating to what you should be eating. You can use an online calorie counter (like this one) to estimate how much you should be eating. 
2. Are you sleeping enough? How many nights did you get at least 7 hours of sleep last week? Less than 3 nights or 2 nights in a row will probably affect your HPG axis function. 
3. Are you training too much? Over 12 hours of aerobic or endurance-type exercise a week may be suppressing your testosterone levels. Try to keep training to under 8 hours a week. 
4. Are you stressed? Are your stress levels consistently above a 7 out of 10? If so, this may be suppressing your HPG axis function. 

Lesson 3: Testosterone is made while you sleep

Research shows that one week of 5-hour sleep reduced testosterone levels by 10-15% in healthy young men. Chronic sleep restriction (less than 6 hours a night for months or years) can suppress testosterone by 20-30%; this is equivalent to ageing 10–15 years⁵.