While there isn’t an official certification for products that aren’t tested on animals, look for “cruelty-free” or “not tested on animals” labeling to verify that a hair-thickening shampoo has not been tested on animals. However, these claims can be misleading since they may indicate that the ingredients were tested on animals, but the final product was not. If the product displays the leaping bunny symbol of the Coalition for Consumer Information on Cosmetics (CCCI), neither the ingredients nor the final product were tested on animals.;