Illustration generated with AI.
I read the studies behind the supplements and the claims, and I write down what they found in plain English. Every source is linked, so you can check my work.
Start here: do testosterone boosters work?
Illustration generated with AI.
One 2009 study found a testosterone rise from D-aspartic acid. Later trials in trained men found no increase, and one found a drop. Here is the evidence.
IngredientSmall trials of fenugreek report a rise in testosterone, but a 2026 meta-analysis rated the evidence very low. See what the best studies show and don't.
SymptomsFatigue and low drive are common after 40, but only some symptoms point to low testosterone. Here is what the research says and when to get tested.
Buying guideWhat a proprietary blend hides, what the FDA requires on a supplement label, and the red flags to check before you buy a testosterone booster.
LifestyleIn a lab study, a week of five-hour nights cut young men's daytime testosterone 10% to 15%. See what the research shows and what it can't tell you.
TestingHow to get a testosterone blood test: why mornings matter, which tests doctors order, and why guidelines draw the line in different places.
SafetyWhat is known about testosterone booster side effects: liver injury, blood sugar, mineral overdoses and hidden drugs, and who should talk to a doctor first.
IngredientIn a placebo-controlled trial of overweight men aged 40 to 70, ashwagandha raised testosterone about 14.7% more than placebo. Here is what that does and doesn't mean.
ResearchA 2020 review found only about a quarter of testosterone boosters had published data behind their claims. Here is what the studies say about each ingredient.
IngredientTongkat ali has a meta-analysis behind it, which is rare for a supplement. Here is what the trials found, how small they were, and what to check on a label.
Who writes this? Marcus Hale, a pen name. I'm not a doctor, and nothing here is medical advice. Read more about the site and how it is funded.