Alcohol and testosterone: the dose is the whole story
One drink and ten drinks do opposite things to male hormones. What controlled feeding studies and a 2023 review of the evidence actually found.
16 September 2026 · 4 min read
Testosterone, evidence first
Guides on sleep, body fat, training and supplements — each one written from the studies it rests on, with every source listed at the bottom of the page.
Start here
The three things with the most evidence behind them.
- 1
Sleep Sleep and testosterone: what one bad week actually does
A small University of Chicago study put men on five-hour nights for a week and measured what happened. Here is what it found, and what it did not.
16 September 2026 · 4 min read
- 2
Body Composition Body fat and testosterone: why the waistline comes before the supplement shelf
Adipose tissue converts testosterone into oestrogen and blunts the signal to make more. Here is the mechanism, and what weight loss reliably and unreliably changes.
16 September 2026 · 3 min read
- 3
Training Does overtraining lower your testosterone? The evidence is thinner than the forums say
A systematic review of 38 studies found basal hormone levels were mostly normal in overtrained athletes. That makes the fatigue argument stronger, not weaker.
16 September 2026 · 3 min read
Latest
9 articles published so far.
Body fat and testosterone: why the waistline comes before the supplement shelf
Adipose tissue converts testosterone into oestrogen and blunts the signal to make more. Here is the mechanism, and what weight loss reliably and unreliably changes.
16 September 2026 · 3 min read
Does overtraining lower your testosterone? The evidence is thinner than the forums say
A systematic review of 38 studies found basal hormone levels were mostly normal in overtrained athletes. That makes the fatigue argument stronger, not weaker.
16 September 2026 · 3 min read
Herbal testosterone supplements: what the trials actually found
A systematic review examined the herbs sold as testosterone boosters. Two had reasonable supporting trials, several had almost nothing, and the reasons matter.
16 September 2026 · 4 min read
Lifting weights and testosterone: the spike is real, the lasting rise mostly is not
Heavy training reliably raises testosterone for less than an hour. Meta-analyses of resting levels after weeks of training tell a much quieter story.
16 September 2026 · 4 min read
Sleep and testosterone: what one bad week actually does
A small University of Chicago study put men on five-hour nights for a week and measured what happened. Here is what it found, and what it did not.
16 September 2026 · 4 min read
Stress, cortisol and testosterone: usually the brain, usually reversible
Sustained stress lowers testosterone by quietening the signal from the brain, not by breaking the testes. What military and endurance studies show about recovery.
16 September 2026 · 3 min read
Supplement reviews
Nothing is reviewed until someone has actually used it.
No reviews published yet. That is deliberate: a product only gets reviewed here once someone on the site has used it long enough to report on it, and the format is already built and waiting. Read how the process works in the editorial policy.