5 - Gentle mechanical exfoliation - the powdery consistency of activated charcoal serves not only to color your soap, but it also has a very mild abrasiveness.  When rubbed on your skin it helps to remove dead skin cells, flakey skin and visible debris on your skin.  Its gentle enough that it won't hurt or scratch you, but effective enough to make your skin feel super soft after using it.

4 - May assist in detox - activated charcoal is used in emergency rooms and hospitals for drug overdoses.  Its has properties that allow certain chemicals, toxins and drugs to be drawn to the charcoal and then be trapped.  There isn't a ton of research if this works on your skin.  However if you're on a health detox and want to use every method to help remove toxins from your body, washing with activated charcoal soap may help.

3 - Removes excess oil from your skin - Acne prone people may benefit from using charcoal soap to help remove excess oil from their face during their daily face washing routine.  The porous nature of charcoal helps in trapping the oil as opposed to just lifting it and rinsing it off.  

2 - Great hand cleaner for cooks - for the same reason it would work great on your face it would do great on your hands as well.  When cooking with lots of oils, sauces and meats, having clean hands is paramount in preventing cross contamination of food borne bacteria.  The charcoal helps absorb the oils and toxins, while the soap helps lift any debris, dirt or pathogens.  You rinse well with water to wash it down the drain.

1 - Treatment for psoriasis and eczema - Psoriasis and eczema sufferers have a tough time finding soaps that won't further contribute to their suffering by drying out the skin even more that it already is.  Charcoal soap helps in removing all of the dead, flakey skin and helps deeply clean pores to help lessen the severity of future breakouts.