That was quite the thing when my grandfather had cancer back in 1971. Mom felt bad that she hadn't been able to get him to drink enough carrot juice soon enough to cure the cancer. I'm not sure if she ever found out that it would do no good. When my husband had prostate cancer, she made him a gallon of Oregon grape root tea (which tastes really nasty) & it didn't do anything for him.

When she got cancer, she didn't try either one. So maybe she did find out they were useless. It wasn't something we talked about.