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.
What the trials say about tongkat ali and testosterone, the limits of the evidence, and how BulkSupplements' 120-capsule longjack extract measures up.
11 November 2026 · 2 min read
The three things with the most evidence behind them.
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
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
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
9 articles published so far.
What the trials say about ashwagandha, stress and cortisol, and how this Nature's Truth capsule compares with the extracts that were actually tested.
11 November 2026 · 3 min read
What the research says about magnesium, testosterone and sleep, who may benefit, and how NOW Foods' magnesium glycinate tablet measures up.
11 November 2026 · 2 min read
What the trials say about vitamin D and testosterone, who is most likely to benefit, and how this NOW Foods 1000 IU softgel measures up.
11 November 2026 · 2 min read
What the research says about zinc and testosterone, who is most likely to benefit, and how Thorne's 30 mg zinc picolinate capsule measures up.
11 November 2026 · 2 min read
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
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
Each product checked against the published research.
5 reviews published. See the review section for the full list.
Products we have actually used, some of which earn us a commission.