i just bought the full sizes of the LK shampoo, conditioner, leave in, and serum. it is very reasonably priced and now i will have enough until i do another treatment. i think the treatment in the kit is enough for two shoulder length treatments. i definitely used too much the first time. i hope the treatment will be available for purchase separately! i L-O-V-E this stuff! for me it is a life changing product! my curly head has never looked so defined and healthy, and my str8 hair has never been so fasat and easy to acheive. i never tried any chemical str8teners because they are so damaging. i am so glad i waited for LK! 40+years!!