Folligen is fine to leave on all night. Absorbsion takes time on some things.
Anyway, it's not really medicated, it's copper peptides which are good.
nizoral, has medicine to destroy dandruff, which when left on too long can cause more harm than good (drying effect)... basically it's allowing yourself to 'over-absorb' the ketaconazole in Nizoral, when only a few minutes absorbtion time is required for effect.
Folligen, needs an overnight stay on your head, before a good wash the next day. It's nice for you !
-Iwant