End Animal Testing & Adopt Alternatives today

1. Poor Predictability for Human Responses 

Animal testing has repeatedly shown that it fails to accurately predict human outcomes. According to the National Institutes of Health, 95% of drugs that prove safe and effective in animals fail in human clinical trials. These failures are not just due to unexpected side effects but also because animal physiology differs too greatly from humans. A recent study also confirmed that only 5% of animal-tested medical therapies are approved for human benefit. The result? Wasted time, money, and animal lives, without any benefit to human health.

Darwin’s theory of evolution has long been held as justification of animal testing, that all species share a common ancestor and shared genetic similarity was reason enough to use these animals as “models” of humans.

Because nonhuman primates are closely related to humans, they are often considered in research and testing. The most common primate species used in science are the rhesus and cynomolgus (or long-tailed) macaques. They are 90-93% genetically similar to humans however that remaining 7-10% difference creates many fundamental biological distinctions completely distorting their suitability in science. The similarity between monkeys and humans are therefore superficial, because what is key to species differences is the way in which DNA is expressed in the body. 

There is a myriad of papers which have highlighted how animal testing of potential new drugs for humans do not sufficiently predict human safety and toxicity. 

This poor translation (from animal testing to human drug development) is supported by the significant biological variation not only between animals and humans but even within each species. For example, populations of macaques within different regions vary so greatly that it can have significant differences in their vulnerability to disease and even in the way they metabolise drugs. 

2. Inability to Model Human Complexity 

Complex human diseases such as Alzheimer’s, cancer, and cardiovascular conditions are poorly modelled in animals. While animals like mice or rats may develop similar diseases, the processes that underlie them are not the same as in humans. For example, rodents have vastly different immune systems and metabolic processes, leading to research that doesn’t apply to humans. This mismatch results in misleading data and costly failures in drug development.

3. Failure to Represent Human Genetic Diversity 

Another critical failure of animal testing is its inability to account for the vast diversity present within the human population. Humans are wonderfully unique—our differences range from the colour of our eyes, hair, and skin to individual allergies and intolerances. These variations are a defining feature of our species and shape how our bodies respond to medical treatments.

Animals, too, have their own specific intolerances to certain plants, foods, and substances like essential oils. What may be safe for humans can have disastrous effects on animals, and vice versa. These key differences highlight a fundamental biological variation between species. So how can we trust the critical testing of medicines on animals when their biology fails to reflect our own?

In fact, humans have nearly missed out on life-saving treatments because of this disconnect. Aspirin, for example, has caused severe effects on animals, yet it has revolutionised human health with its pain-relieving and anti-inflammatory properties. Similarly, penicillin, a drug that can be lethal to some animals, has saved countless human lives by combating bacterial infections. The solution to this problem does not lie in testing on animals that only share superficial similarities with us but rather in embracing human-relevant, cutting-edge scientific solutions.

4. Ethical and Moral Failures 

Beyond the scientific flaws, animal testing is simply cruel. Every year, millions of animals endure pain, fear, and slaughter in laboratory settings. These animals are often subjected to invasive procedures, deprivation, and long-term suffering, without any relief from their pain. Continuing to use animals in experiments when viable alternatives exist is ethically indefensible.