One question I hear constantly: should I try to optimise naturally, or should I just get on TRT?
The answer is: it depends. Not every man with low testosterone needs TRT. And not every man is a good candidate for it. Let me break down what each approach can actually deliver, the trade-offs, and how to think about the decision.
What Natural Optimisation Can Realistically Achieve
If your testosterone is suppressed by modifiable factors, fixing them can make a real difference.
Sleep optimisation. One of the biggest testosterone suppressors is poor sleep. Most men sleeping 5–6 hours have testosterone 15–25% lower than their genetic potential. Moving to consistent 7–9 hours can recover 10–20% of that loss.
Body composition. Excess body fat raises oestradiol and lowers SHBG (which paradoxically lowers free testosterone despite raising total testosterone). Losing 5–10kg of fat can raise testosterone by 10–25%.
Stress management. Chronic stress elevates cortisol, which suppresses testosterone synthesis. Reducing stress (exercise, meditation, sleep, social connection) can recover 5-15%.
I spent 14 months on a natural optimisation protocol — sleep, training, body fat reduction, magnesium, vitamin D, tongkat ali — and my total testosterone went from 12.1 nmol/L to 17.8 nmol/L. Meaningful, but still below where I felt optimal. That data made the TRT conversation straightforward: I had done the work, the ceiling was clear.
Travison et al. - Population-Level Testosterone Decline
Testosterone levels have declined approximately 1% per year in American men since the 1980s, independent of age - highlighting the role of environmental and lifestyle factors in hormonal health.
Thyroid and prolactin. If you're hypothyroid or have elevated prolactin, fixing those conditions can raise testosterone by 20–40%.
Strength training and conditioning. Intense resistance training and intervals stimulate testosterone acutely and chronically. A consistent program can raise baseline testosterone by 10–20%.
Nutrition. Adequate calories, protein (1.6–2.2g/kg), and micronutrients support testosterone. Poor nutrition suppresses it.
Alcohol reduction. Regular heavy drinking suppresses testosterone. Cutting back can recover 5–15%.
Put it together: A man who optimises sleep, loses 8kg of fat, fixes his thyroid, trains consistently, reduces alcohol, and manages stress might see a 40–60% testosterone increase. Starting at 350 ng/dL, he could reach 500–560 ng/dL.
This is real improvement. It's not trivial.
The Ceiling of Natural Optimisation
Here's the hard truth: if you've optimised everything and your testosterone is still below 350 ng/dL at age 45+, you're probably looking at a baseline testosterone regulation issue, often genetic, sometimes related to insulin resistance or other metabolic factors.
Natural optimisation has a ceiling. Most men can realistically improve 20–40% if starting from a suppressed baseline. A few might achieve 50% with exceptional dedication. But you're not getting from 300 to 800 ng/dL through sleep and squats.
Once you've optimised properly and done a full hormonal workup (testosterone, LH, FSH, prolactin, thyroid, oestradiol), you have a clearer picture of whether TRT is appropriate.
What TRT Delivers
Testosterone replacement therapy (usually administered as intramuscular injections, gels, or pellets) typically raises total testosterone to 600–1,100 ng/dL depending on dose and formulation.
Physical effects:
- Increased muscle mass and strength (assuming adequate training)
- Improved body composition (fat loss, especially visceral fat)
- Increased bone density
- Improved mood, motivation, and energy
- Improved libido and sexual function (in most cases)
- Improved cardiovascular markers (in many cases)
The scale of change: Men often describe TRT as transformative. Not in the way Instagram claims, but genuinely life-changing. Energy, motivation, mood, and function improve substantially.
Timeline: Most effects develop over 3–6 months. Maximum benefits typically reached by 6–12 months.
Who Is a Genuine Candidate for TRT
You're a reasonable candidate if:
You have symptomatic low testosterone. Not just "low-normal." Genuine symptoms: persistent low libido, erectile dysfunction, fatigue, mood issues, poor training response.
You have consistently low testosterone across multiple tests. A single test of 380 ng/dL isn't enough. Most guidelines recommend two morning tests, ideally fasting. If both are below 350 ng/dL and you're symptomatic, TRT is worth discussing.
You've optimised modifiable factors first. Sleep, training, diet, body composition, stress. If you haven't, TRT might work anyway, but you won't know if the problem was modifiable or fundamental.
You understand the commitment. TRT isn't a short-term fix. It's a lifelong decision in most cases (though some men eventually come off successfully).
You have access to proper monitoring. Quarterly blood work, dose adjustment, monitoring of haematocrit, liver function, lipids. If you can't commit to this, don't start TRT.
You're probably NOT a good candidate if:
- You have testosterone in the 400–500 ng/dL range and minimal symptoms (try natural optimisation first)
- You have untreated sleep apnoea, obesity, or other reversible conditions (fix these first)
- You're not willing to commit to monitoring and bloodwork
- You have a personal or family history of prostate or breast cancer (relative contraindication; needs careful risk-benefit discussion)
- You're young (under 30) unless you have genuine hypogonadism (rarely appropriate for young men)
The Downsides and Commitments of TRT
Exogenous suppression. Once you start TRT, your hypothalamic-pituitary-testicular axis shuts down. Your testis stops producing testosterone. For most men, fertility is preserved for 1–2 years, then declines. If you want biological children, this is a significant consideration.
Cost. Private TRT in the UK typically costs £100–300 per month depending on clinic and formulation. That's £1,200–3,600 per year, indefinitely.
Bloodwork and monitoring. Quarterly (minimum) blood tests: testosterone, LH, FSH, oestradiol, haematocrit, liver and kidney function, lipids. Cost: £40–80 per test, 4+ times yearly.
Haematocrit management. TRT raises red blood cell mass. Haematocrit typically rises 3–5%. In a small proportion of men, it rises excessively (>55%), increasing thrombotic risk. Dose reduction, blood donation, or therapeutic phlebotomy may be needed.
Cardiovascular monitoring. The evidence on TRT and cardiovascular risk has evolved. The 2010 Basaria study suggested concern; the 2023 TRAVERSE trial found no increase in major adverse cardiovascular events (MACE) in men with baseline cardiovascular disease treated with TRT. But individual risk varies.
Water retention and bloating. Many men on TRT retain slightly more water, especially if oestradiol conversion is high. Usually manageable.
Acne and male pattern baldness. Increased androgens can exacerbate acne and accelerate hair loss in genetically predisposed men.
Dependency. Once you've been on TRT for 2+ years, restarting natural testosterone production is difficult and takes months. You're essentially committing to TRT long-term.
TRT vs Natural: Side by Side
| Aspect | Natural Optimisation | TRT | |---|---|---| | Testosterone Range | 400–550 ng/dL (if optimised) | 600–1,100 ng/dL | | Cost (annual) | £0–500 (supplements, maybe testing) | £1,200–3,600 (medication + bloodwork) | | Effort/Lifestyle | High (sleep, training, diet discipline) | Moderate (injections weekly, bloodwork quarterly) | | Fertility | Preserved | Suppressed initially, may be permanent | | Side Effects | Minimal if done right | Possible (haematocrit, water retention, hair loss) | | Reversibility | Fully reversible | Largely reversible but takes months | | Long-term Commitment | Ongoing discipline | Ongoing (usually lifelong) | | Realistic Timeframe | 3–6 months to see full effects | 6–12 months to see full effects |
The Practical Decision Framework
Step 1: Optimise everything you can control for 3–6 months. Sleep, training, diet, stress. Retest testosterone.
Step 2: If testosterone is still <350 ng/dL with symptoms, do a full hormonal workup. Check LH, FSH, prolactin, thyroid, oestradiol. Use Medichecks.
Step 3: If LH and FSH are normal, you probably have secondary hypogonadism (problem in the pituitary or hypothalamus). You're likely a candidate for TRT.
Step 4: If LH and FSH are low or low-normal and you're symptomatic, TRT will work well.
Step 5: Get a second opinion from a private endocrinologist if possible. Ensure TRT is the right move.
Step 6: Commit to monitoring, dose adjustment, and ongoing bloodwork.
When TRT Makes Sense
TRT is genuinely life-changing for men who are good candidates. If you've optimised naturally and testosterone is still 300–350 ng/dL with symptoms, if LH and FSH are normal, and if you understand the commitment and downsides, TRT is often the right choice.
The men who regret TRT are usually those who:
- Started without proper testing (weren't actually hypogonadal)
- Started without optimising naturally first (they could have improved without it)
- Weren't willing to monitor or manage side effects
- Didn't understand the commitment
The men who thrive on TRT are those who:
- Got properly tested
- Optimised everything modifiable first
- Went in with realistic expectations
- Commit to bloodwork and dose management
The Bottom Line
Natural optimisation can deliver meaningful improvements (20–40% if starting from suppressed), but has a ceiling around 500–550 ng/dL for most men. TRT delivers higher levels (600–1,100 ng/dL) but commits you to lifelong medication, monitoring, and potential side effects.
Neither is inherently "better." It depends on your starting point, symptoms, and what you're willing to commit to. Optimise naturally first. Test properly. Get an expert opinion. Then decide with full information.
The worst outcomes happen when men either avoid TRT despite needing it, or jump into it without trying natural optimisation first. Meet yourself where you are, test thoroughly, and choose the path that makes sense for your situation.
Natural optimisation can recover 20-40% of suppressed testosterone (up to a ceiling of roughly 500-550 ng/dL), but if you are still symptomatic after 3-6 months of proper lifestyle work, TRT is the evidence-backed next step.
For the natural optimisation protocol in full, see the testosterone optimisation guide. If you decide TRT is the right path, the TRT complete guide covers protocols and monitoring. And for a cost comparison of UK treatment options, the TRT cost guide breaks down NHS versus private spending.
