The study, which took place in Denmark and France, involved 31 men under the age of 35.
Now, before you panic, there's no suggestion yet that occasionally relying on an ibuprofen will make your balls shrivel up and die.
Ibuprofen belongs to a group of drugs called non-steroidal anti-inflammatories, or NSAIDs, that work by blocking the production of hormone-like signaling molecules called prostaglandins, which theoretically reduces pain and inflammation. In the men receiving ibuprofen, levels of luteinizing hormone were up, and the ratio of testosterone to luteinizing hormone dropped.
Even though this was a small study and further research is needed, the findings are important because ibuprofen is one of the most widely-used medications, Erma Drobnis, an associate professional practice professor of reproductive medicine and fertility at the University of Missouri, Columbia, told CNN.
Men who dream of starting a family may want to pass on the ibuprofen the next time they have a headache.
They tracked how ibruprofen affected them, noting that the painkiller can affect your body's hormone levels. Each dose was 600mg, equivalent to three over-the-counter pills.
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Advil and Motrin are two brand names for ibuprofen.
However, in recent years, ibuprofen in particular has been linked to an increased risk of heart attacks and strokes, meaning we should be more cautious when taking anti-inflammatory drugs.
Such a condition is the result of the body increasing testosterone production because the testes stop producing adequate levels of it.
Fortunately, the condition went away in the volunteers when they stopped taking the medication. In both cases, ibuprofen had a direct effect on the testicles.
"The safety and efficacy of active ingredients in these products has been well documented and supported by decades of scientific study and real-world use", said Mike Tringale, a spokesman for the association, according to Fox News.
Bernard Jégou, a senior author on the study at the French National Institute of Health and Medical Research, said he saw no problem in people taking ibuprofen to alleviate pain in the short term - for toothache, for example - but warned against taking the drug for months on end if it was not strictly necessary.