{"id":41659,"date":"2026-08-01T07:46:25","date_gmt":"2026-08-01T07:46:25","guid":{"rendered":"https:\/\/this-is-vegan.com\/?p=41659"},"modified":"2026-08-01T07:46:25","modified_gmt":"2026-08-01T07:46:25","slug":"animal-testing-translation-gap-evidence","status":"publish","type":"post","link":"https:\/\/this-is-vegan.com\/en\/animal-testing-translation-gap-evidence\/","title":{"rendered":"Only 5 in 100: What the Evidence Says About Animal Testing"},"content":{"rendered":"

Almost two million animals die in German laboratories every year. The justification has stayed the same for decades: it serves medical progress, and there is no alternative. A major scientific analysis published in 2024 now challenges that reasoning with hard numbers. Of 100 compounds that successfully pass animal testing, only five ever receive regulatory approval.<\/p>\n

That figure does not come from an animal rights group. It comes from an analysis in the journal PLOS Biology<\/em>, authored by researchers at the University of Zurich and the University of Edinburgh.<\/p>\n

What the study actually examined<\/h2>\n

The team led by Benjamin Ineichen did not evaluate a single study. They produced an umbrella review, meaning a review of reviews. They analysed 122 systematic reviews<\/a> covering 4,443 animal studies and 1,516 clinical studies, spanning 367 therapeutic interventions across 54 different diseases.<\/p>\n

To answer the decisive question of how much actually reaches patients, the researchers looked at 281 therapies whose first animal trials lay at least ten years in the past. The results are sobering.<\/p>\n

\"Infographic:<\/p>\n

The path from animal study to approved medicine, in numbers. Feel free to save and share this graphic. If you use it elsewhere, please link back to this article.<\/em><\/p>\n

Only half of the approaches that worked in animals were ever tested in humans at all. Forty percent made it into a randomised controlled trial, the gold standard of clinical research. And a mere five percent ultimately received approval from the FDA or an equivalent agency. Median time to get there: ten years.<\/p>\n

The honest caveat: what the study also found<\/h2>\n

It would be easy at this point to take the headline number and move on. That would be dishonest, because the same study contains a finding that appears to point the other way. Between positive results in animals and positive results in humans, the researchers found 86 percent concordance. Where an animal study showed an effect, that effect frequently appeared in clinical studies too.<\/p>\n

So how do these fit together? The authors themselves conclude that the low approval rate says less about overly strict regulators and more about design flaws in both the animal studies and the early clinical trials. Put differently: the system loses an enormous amount along the way, and animals pay for that with their lives regardless of whether a medicine comes out at the end.<\/p>\n

There is a methodological point the study raises as well. A large share of the reviews analysed showed considerable quality problems, such as missing blinding or randomisation. Anyone defending the predictive value of animal research has to face that criticism too.<\/p>\n

\"Two<\/p>\n

Rats and mice account for the vast majority of all animals used in research.<\/em><\/p>\n

Nearly two million animals a year, in Germany alone<\/h2>\n

The scale becomes clear in the official statistics. For 2024, the German Centre for the Protection of Laboratory Animals at the Federal Institute for Risk Assessment reports 1,954,469 animals<\/strong> used for scientific purposes.<\/p>\n

That number is only half the picture. Add the animals bred but never used in an experiment and killed afterwards as so-called surplus animals, and the total climbs to 3,063,569<\/strong>. More than a million animals die without ever having been part of an experiment. They simply had the wrong genetics or the wrong sex.<\/p>\n

\"Infographic:<\/p>\n

Almost two million animals were used in German laboratories in 2024. Feel free to save and share this graphic. If you use it elsewhere, please link back to this article.<\/em><\/p>\n

There is some movement in the right direction. The figures have fallen for the fifth consecutive year, down roughly nine percent in 2024 compared with the year before, and for the first time since the turn of the millennium they sit below two million. The trend points the right way, just painfully slowly.<\/p>\n

What is technically possible today<\/h2>\n

The strongest argument against animal testing is no longer purely moral. It has become scientific, because the alternatives have simply got better in many areas:<\/p>\n