Foreskin testing = using cells taken from infant foreskins (not ones from older babies, just newborns) to test out specific chemical combinations that manufacturers want to use in cosmetics and other products used ON the skin. They look to find abnormal growth patterns, and determine from that whether the products may affect people significantly or nominally, and if so, whether it is worth the risk to produce the product with a small label (known side effects etc.) or to discontinue research on it. Foreskins provide a good free source of direct skin, rather than synthesized skin. They are differentiated tissue cells (unlike umbilicus which are undifferentiated), which means they use them because they should react the same way as skin from elsewhere on the body. Unfortunately that isn't the case. Skin is very different place to place. Nipples and penis shafts and vulva and anal skin is very similar in stretch, and sensitivity, but the construction of the skin layers is very different. Just as an example. Anyway, there isn't much evidence that testing on skin cells outside of the 'real world' has had any positive effect on the cosmetic industry's impact on human health - and none that it hasn't! In most cases, the g'vt will say that it is the company's responsibility to test the product to the satisfaction of the FDA (if it falls within the purview of the FDA that is!), and the company will say it is the responsibility of the FDA to protect the public from potentially hazardous products.


I'd be really interested too, though, in a list if there were one!