This helps show that vitamin C could be negative for cancer patients. If some cancer cells interfere with cancer therapies by absorbing lots of vitamin C, taking vitamin C might undermine the effectiveness of cancer therapies.

Vitamin C is recommended because it helps guard against developing “other health problems.” So, even if it doesn’t help with cancer, it can still guard against other illnesses in a cancer patient. We’d still expect doctors to recommend vitamin C to cancer patients.

Vitamin C is recommended because it helps guard against developing “other health problems.” Even if it doesn’t help with killing cancer cells, it can still guard against other illnesses in a cancer patient. We’d still expect doctors to recommend vitamin C to cancer patients.

This doesn’t tell us anything about vitamin C or how it might affect cancer patients.

Vitamin C is recommended because it guards against developing “other health problems.” Even if it doesn’t help with side effects of therapies, it can still guard against other illnesses in a cancer patient. We’d still expect doctors to recommend vitamin C to cancer patients.