Does horse shampoo actually get my hair to become longer?

Im seventeen yrs old, i wash my hair twice a week (if even) to keep natural oils, im miixed. (brazilian- african american) and i was wondering if horse shampoo is supposed to make hair longer. naturally my hair is thin... but all it seems to be doing is making my hair thicker instead of longer. i trim the edges and dont take vitamins at the moment, cept for fish oil.