Over centuries humans have experimented with many different chemicals, products, and processes, with the final aim of bettering our conditions. Testing products on animals most likely dates back centuries, however, in modern society it is a controversial point. Below is an outline of circumstances when it could be considered acceptable and unacceptable.
Firstly, it is clear that major advances in fighting disease, viruses and illnesses would not have been made without testing products on animals. This is because it is inhumane to test the products on healthy human beings, likewise using computer modelling to predict reactions is only a recent possibility and still not as reliable as testing on animals. Therefore without experiments on animals, breakthroughs in medicine would have been impossible, and most would agree the price paid has been worth it.
Conversely, it could be argued that medical research carried out for mere cosmetic ends is undoubtedly not worth the lives of innocent animals. This is largely for two reasons, firstly a large body of research is said to have been built up previously from past experiments, and secondly there are alternatives such as dermatological testing or using natural ingredients. For example, retail chains such as Lush and The Body Shop have both made fortunes by positioning themselves as natural solutions against animal testing. Therefore due to the end rationale for testing on animals, and the alternatives available, it is clear it is completely unjustifiable in this situation.
To conclude animal welfare can be side-stepped when the situation is threatening humans and computer alternatives are simply too premature. Nevertheless, when the research has rather fickle motives and viable alternatives do exist, in these cases the loss of animal’s lives in inexcusable. 
Over centuries humans have experimented with  
many
  different
 chemicals,  
products
, and processes, with the final aim of bettering our conditions.  
Testing
  products
 on  
animals
 most likely dates back centuries,  
however
, in modern society it is a controversial point. Below is an outline of circumstances when it could  
be considered
 acceptable and unacceptable. 
Firstly
, it is  
clear
 that major advances in fighting disease, viruses and illnesses would not have  
been made
 without  
testing
  products
 on  
animals
. This is  
because
 it is inhumane to  
test
 the  
products
 on healthy human beings,  
likewise
 using computer modelling to predict reactions is  
only
 a recent possibility and  
still
 not as reliable as  
testing
 on  
animals
.  
Therefore
 without experiments on  
animals
, breakthroughs in medicine would have been impossible, and most would  
agree
 the price paid has been worth it. 
Conversely
, it could  
be argued
 that medical research carried out for mere cosmetic ends is  
undoubtedly
 not worth the  
lives
 of innocent  
animals
. This is  
largely
 for two reasons,  
firstly
 a large body of research  
is said
 to have  
been built
 up previously from past experiments, and  
secondly
 there are  
alternatives
 such as dermatological  
testing
 or using natural ingredients.  
For example
, retail chains such as Lush and The Body Shop have both made fortunes by positioning themselves as natural solutions against  
animal
  testing
.  
Therefore
 due to the  
end
 rationale for  
testing
 on  
animals
, and the  
alternatives
 available, it is  
clear
 it is completely unjustifiable in this situation. 
To conclude
  animal
 welfare can be side-stepped when the situation is threatening humans and computer  
alternatives
 are  
simply
 too premature.  
Nevertheless
, when the research has  
rather
 fickle motives and viable  
alternatives
 do exist, in these cases the loss of  
animal’s
  lives
 in inexcusable.