I’ve seen the term a lot on threads but not sure what it is, and how it’s used. Is it homemade or is it store bought? What does it do? Thx

Stage 3 cancer of right side of tongue
Tumor: t2.
Lymph nose spread
Partial glossectomy and neck dissection (2/12/20)
Never smoker
Completed six weeks of radiation on 5/6/20