A large share of people receiving cancer treatment take supplements. A large share of them have never told their oncologist. Those two facts are the whole problem, and the reasons behind them are more understandable than they first appear.
Why it often goes badly
Oncology appointments are short and the agenda is set by the treatment. Scans, counts, dosing and side effects fill the time before anything optional gets raised.
Supplement pharmacology is also not a large part of oncology training, and the honest answer to most specific questions is that the studies have not been done. “I don’t know” is an uncomfortable thing to say in a short appointment, and it can come out sounding like dismissal when it is actually uncertainty.
And some patients arrive having read that a supplement will treat their cancer. Oncologists encounter that often enough that a supplement question can be heard as the opening of an argument rather than a practical question about safety.
None of this makes the brush-off less frustrating. It does suggest how to get past it.
How to raise it so you get an answer
Bring the actual bottles, or photographs of the labels. Doses and specific formulations matter, and “a multivitamin” does not tell anyone enough to check anything.
Lead with the safety question, not the benefit question. “Will any of these interfere with my treatment?” is a question your team is equipped to answer and motivated to answer. “Will this help my cancer?” is a different conversation and usually a shorter one.
Ask to speak with the oncology pharmacist. This is the most useful single move available to you. Oncology pharmacists know your specific protocol and its interaction profile in detail, they have more time than the physician, and checking drug interactions is literally their job. Most cancer centers have one and most patients never ask.
Ask for the answer in writing, or write it down yourself during the appointment. “Fine to continue,” “pause during infusion weeks,” and “stop entirely” are three different answers and they blur in memory.
Raise it before you start, if you can. Bringing a list at the planning visit is easier than introducing it mid-cycle.
If you are still dismissed
Being brushed off is a legitimate complaint, not an overreaction. It is also not a reason to stop asking or to go without oncology care.
Ask the pharmacist directly if the physician conversation stalls. Ask the infusion nurses, who often know what patients take and what the team’s actual position is. If the relationship is consistently unworkable, a second opinion is your right, most cancer centers will help arrange one, and many insurers cover it.
What is not a good outcome is deciding to simply not mention it. That leaves the one person who could catch a real interaction unable to catch it.
Where we fit
Part of what we do is take a complete inventory of what you are taking, cross-reference it against your specific protocol, and give you a written summary your oncology team can actually use. We share it with them; we do not work around them.
We also do not advise you on whether to accept, delay or decline any oncology treatment. Those questions belong to your oncologist, and if you ask us, that is what we will tell you.
For what the evidence actually shows, see supplements during chemotherapy and vitamins to avoid during chemotherapy.
If you want help putting your supplement list in a form your oncology team can use, that is what our supportive care consultation covers. Start with a free 15-minute call.
Alvin Philipose, DC, ICCP
This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment recommendation. It is not a substitute for guidance from your oncologist or oncology pharmacist.