Amway Nutrilite Protein Powder Can Take Cancer Patients?my Mother Had

Amway nutrilite protein powder can take cancer patients?my mother had nack cancer,after surjury and redistion she recover,tretment time she take lots of protein powder as food supliment,now she can eat so stop eating food duppliment,but some times she feels weak becose lake of eating .so dr. i want to know this protin powder is safe and effective for her?