Generally,  All cruise lines provide basic toiletries; some offer individual bars of soap and bottles of shower gel, shampoo and conditioner, but others go with a combo shampoo/conditioner in a dispenser.  They are of course others, which are usually the high end cruise lines of course that supply you with the “posh” amenities. To give you an idea you could have some Bulgari, L’Occitane, Molton Brown, Hermes, Aveda, Salvatore Ferragamo and Elemis produce which are all rather fab and they top them up every day! I guess, if you are so inclined you could have quite a stash with these!

These are not just what you can get.  For example on my last Celebrity cruise, I was in Aqua class so i got the lovely slippers and dressing gown, along with the Aqua Spa “amenity kit” that include foot spray, lip balm and relaxation mist.  Not counting the “fluffier” towels!