The Claim

Testosterone-replacement therapy has no statistically significant effect on the risk of stroke in middle-aged and older men with low testosterone, as indicated by a relative risk of 1.00 (95% CI 0.67–1.50) after at least 12 months of treatment compared to placebo.

Source: Long-Term Cardiovascular Safety of Testosterone-Replacement Therapy in Middle-Aged and Older Men: A Meta-analysis of Randomized Controlled Trials

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
45score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

In middle-aged and older men with low testosterone, testosterone-replacement therapy does not change the risk of stroke compared to a placebo when taken for at least 12 months.

See the scientific wording

Testosterone-replacement therapy does not significantly affect the risk of stroke in middle-aged and older men with low testosterone, with a relative risk of 1.00 (95% CI 0.67–1.50), indicating no statistically significant benefit or harm compared to placebo after at least 12 months of treatment.

Why this might work

Testosterone replacement in older men with low levels does not change the balance of clotting, blood vessel function, or inflammation in the brain's blood vessels, so the chance of a stroke stays the same as without treatment.

Verified mechanismbased on 1 study

What the research says

1 study
  1. Study: Long-Term Cardiovascular Safety of Testosterone-Replacement Therapy in Middle-Aged and Older Men: A Meta-analysis of Randomized Controlled Trials

    In older men with low testosterone, taking testosterone therapy didn't make them more or less likely to have a stroke compared to those who didn't take it, based on a big study of thousands of men.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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