Scientists fed old male mice a special chemical called 17-α-estradiol and found they lived about 19% longer than mice that didn't get the chemical.

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Evidence from Studies

Supporting (1)

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17‐a‐estradiol late in life extends lifespan in aging UM‐HET3 male mice; nicotinamide riboside and three other drugs do not affect lifespan in either sex

Cohort Study

Animal

2021 May

The study gave the same drug (17-α-estradiol) at the same dose to the same type of male mice starting at the same age as the claim describes, and found exactly the same result: a 19% increase in median lifespan with high statistical significance. It also tested other drugs that didn't work, confirming this was the most effective treatment.

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No contradicting evidence found

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According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

17‐a‐estradiol late in life extends lifespan in aging UM‐HET3 male mice; nicotinamide riboside and three other drugs do not affect lifespan in either sex

Score: 13

DOI: 10.1111/acel.13328

Similar Assertions

Scientists gave old male mice a special compound called 17-alpha-estradiol in their food starting at 20 months old (roughly equivalent to late middle age in humans), and the mice lived about 11% longer than mice that didn't get the compound.

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97%

A special form of estrogen called 17-alpha-estradiol helped male mice live longer, but female mice given the same amount didn't get any lifespan benefit.

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Giving male mice a special compound called 17-α-estradiol when they were middle-aged (16 months) helped them live about 7% longer, specifically extending their maximum lifespan.

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Scientists gave old mice a compound called 17-alpha-estradiol when they were already pretty old (like 50-60 human years), and it still made them live 11% longer on average.

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90%

Scientists gave old male mice a special compound called 17-alpha-estradiol when they were about 1.3 years old, and it helped them live about 19% longer - going from an average of about 2 years to over 2.5 years.

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89%