Category: Conditions & Symptoms
Most people do not tell their doctor what supplements they take, and that silence causes real, avoidable problems. Here is why disclosure matters and exactly how to have the conversation.
Category: Conditions | Reading time: ~12 min | Level: Beginner
There is a conversation that a lot of people quietly skip. They take a handful of supplements, a vitamin here, a herb there, something a friend recommended, and when they sit down in front of their doctor, none of it gets mentioned. Sometimes it slips their mind. More often there is a half-formed assumption behind the silence: that supplements are natural, therefore harmless, therefore not the sort of thing a doctor needs to hear about. The medicines go on the record. The supplements stay in the cupboard, unspoken.
That silence is a problem, and it is a common one. A large share of people who take supplements never tell the clinician managing their care, and the gap is exactly where avoidable trouble lives. A supplement your prescriber does not know about is a factor they cannot account for when they choose a medicine, adjust a dose, or plan a procedure. The issue is rarely that supplements are dangerous in themselves. It is that decisions made with an incomplete picture can go wrong in ways a complete picture would have prevented.
This is a practical guide to closing that gap. Why disclosure matters more than most people realise, what actually interacts with what, and how to raise it in a rushed ten-minute appointment without awkwardness. None of it is complicated. It mostly comes down to treating your supplements as real inputs to your health, which is what they are, and giving the people looking after you the full list.
The belief that natural means harmless is the root of the whole problem, and it does not survive contact with how the body handles these compounds. A substance active enough to have an effect you want is, by the same token, active enough to have effects you did not plan, including on the medicines you take.
One mechanism example makes it concrete. St John's wort, a herb widely used for low mood, is one of the best-documented causes of supplement drug interactions [2]. It speeds up a family of liver enzymes, the CYP450 enzymes, that break down a great many prescription drugs. The result is that those drugs can be cleared from the body faster and their effect reduced, which matters enormously for medicines where a steady level is the point, such as certain contraceptives, immune-suppressing drugs and some heart medicines [2]. Nothing about that is exotic or rare. It is a plant sold on shelves quietly changing how a prescription works.
Other examples run in other directions. Some herbs and high-dose fish oil can affect bleeding, which matters if you take a blood thinner or are heading for surgery. Ginseng can add to blood-sugar-lowering medication and disturb sleep [3]. The specifics vary, and no one expects you to memorise them. That is the whole point of telling your prescriber: they can only weigh an interaction they know exists, and a supplement you never mention is a variable removed from their view.
It helps to name the reasons the conversation gets skipped, because most of them dissolve once said out loud.
The first is the natural-equals-harmless assumption, which we have just seen is false. The second is a worry about judgement: a sense that the doctor will disapprove, lecture, or think less of you for taking supplements at all. Some clinicians are sceptical, it is true. But a sceptical doctor still needs your full list to prescribe safely, and their opinion of supplements is a separate matter from their need for accurate information. The third reason is simple forgetting, the appointment is short, the list is long, and it never comes up.
None of these is a good reason to leave your prescriber working blind. Disclosure is not asking for permission or endorsement. It is giving the person responsible for your medicines the information they need to do that job without a hidden variable. Framed that way, the awkwardness mostly evaporates. You are not confessing. You are updating a record.
The practical part is short, because it should be.
Prepare a list before you go. For each supplement, note the name, the specific form if the label states one, the dose per serving, how many servings you take a day, and roughly how long you have been taking it. If writing that out feels fiddly, photograph each label with your phone and note how often you take it. Either version gives a clinician what they need.
Lead with it. At the start of the appointment, say plainly that you take some supplements and you would like them on your record, then hand over the list or the photos. Doing it first means you are not still fumbling for the bottle names as the appointment runs out. It takes under a minute and it changes what the clinician is working with for everything that follows.
Flag the two moments that matter most. If you are being started on a new medicine, say what you take before the prescription is written, not after. And if you have any surgery or procedure planned, tell the surgical team everything you take, well ahead of time, because some supplements are routinely paused beforehand and the timing is theirs to advise, not yours to guess.
Use the pharmacist. If your GP appointment is too rushed for a proper interaction discussion, a pharmacist is often the better resource for that specific question, with more time and a strong grasp of interactions. Asking them to check a supplement against your medication list is exactly what they are there for.
The underlying habit is to treat supplements as part of your medical picture rather than a private hobby running alongside it. That means keeping an up-to-date list, sharing it without editing out the embarrassing length of it, and raising it actively at the moments that count rather than hoping it comes up.
It also means resisting a specific false comfort: that a supplement must be safe with your medication because the same shop sold you both, or because it is available without prescription. Neither of those is a safety check. A real check is someone who knows your full medication list looking at the specific combination, and that only happens if they know what you take. The pharmacy selling you two products in the same basket has checked nothing about how they behave together.
And if a supplement is doing something for you, that is all the more reason to disclose it, not less. A supplement with a real effect is precisely the kind that can have a real interaction. The ones worth taking are the ones worth mentioning.
Two safety points deserve emphasis rather than a footnote. Never stop an essential prescription medicine on your own because you have read about an interaction, because stopping the drug can be far more dangerous than the interaction you were worried about; raise it with your prescriber and let them manage the change. And never assume the natural label removes the need for care, particularly around pregnancy, breastfeeding, existing medical conditions and surgery, where the stakes are higher and the interactions less forgiving.
Pregnant, breastfeeding, or on medication? Check with a healthcare professional first. That line runs through everything we write for a reason: it is the moment where an honest supplement library hands you back to the person who knows your whole situation.
We would rather you have this conversation than not, even though it sometimes ends with a clinician telling you to stop something we might otherwise have suggested. That is the right outcome. A supplement library that discouraged you from talking to your doctor would be putting its own interests ahead of your safety, which is the opposite of what we are trying to build.
So our standing advice is the plain one you will see repeated across this library: if you take medication, are pregnant or breastfeeding, or have a procedure coming up, talk to a healthcare professional before adding or continuing a supplement. To make that conversation easier, our label forensics guide helps you record exactly what is in each product, and our guide to finding honest supplement information helps you arrive with good questions rather than marketing claims.
You can ask Remy to help you think through what to raise, but Remy is a preparation tool for that conversation, not a replacement for it. The clinician who knows your full picture is the one who gets the final word.
The FAQ entries above answer the practical questions: whether you really need to disclose, whether your doctor will judge you, which supplements interact, how to raise it in a short appointment, and what to do before surgery. The short version: disclose everything in writing, lead with it, pay special attention around new prescriptions and procedures, and use a pharmacist for detailed interaction checks.
1. National Center for Complementary and Integrative Health (2024). Be informed and talk to your health care providers about complementary approaches. nccih.nih.gov. Government health information body. 2. Nicolussi S, et al. (2020). Clinical relevance of St John's wort drug interactions revisited. British Journal of Pharmacology. Review. 3. European Medicines Agency, HMPC (2024). European Union herbal monograph on Panax ginseng radix (EMA/HMPC/27744/2023). Herbal monograph, traditional use.
Yes, especially if you take any prescription medicine or have a planned procedure. Supplements are not inert just because they are sold without prescription. Some interact with common drugs, affecting how well the medicine works or adding to its effects. Your prescriber makes decisions based on what they know you are taking, so an undisclosed supplement is a blind spot they cannot manage. Telling them is a small thing that prevents avoidable problems.
Most will not. A good clinician wants an accurate picture more than they want to debate your choices, and disclosure helps them keep you safe. Some doctors are more sceptical of supplements than others, but even a sceptical one needs to know what you take to prescribe safely. If yours shuts the conversation down, you can still insist the information goes in your record, because it matters for your care regardless of their opinion.
Several common ones can. St John's wort is a notable example, because it speeds up how the body clears many drugs and can reduce their effect. Some herbs and high-dose fish oil can affect bleeding, which matters with blood thinners and surgery. Others can add to blood-sugar or blood-pressure lowering, or to sedation. This is not a full list, which is exactly why your prescriber needs to know everything you take rather than guessing.
Lead with it. At the start, say you take some supplements and you want them on the record, then hand over a written list or a photo of the labels. That takes seconds and saves the appointment from running out before you get to it. If you are starting a new medicine or booking surgery, say so explicitly, because those are the moments where interactions matter most.
Often some of them, yes, but do not guess. Certain supplements are commonly paused before an operation because they can affect bleeding or interact with anaesthesia. The right move is to tell your surgical team everything you take, well in advance, and let them tell you what to stop and when. Do not stop essential prescription medicines on your own, and do not assume a supplement is fine just because it is natural.
Keep disclosing anyway, and make it about safety rather than opinion. You can say you are not asking for an endorsement, only that they note what you take in case it affects a prescription. If you want a more engaged conversation, a pharmacist is often an excellent and underused resource for interaction questions specifically, and they tend to have more time for it than a rushed GP appointment.
List them all anyway. Embarrassment is a much smaller cost than an interaction your prescriber could not see coming. Clinicians would far rather have the complete, slightly long list than a tidy, edited one that hides something relevant. If the length itself gives you pause, that might be a useful prompt to review whether you still need each one, ideally with the same clinician or a pharmacist.
Not necessarily. A shop selling you both does not mean anyone checked them together, particularly if you bought the supplement off the shelf or online. The check has to be active: someone who knows your full medication list looking at the specific combination. That is the pharmacist's or prescriber's job, and it only happens if they know what you are taking.
For each supplement: the name, including the specific form if it says one, the dose per serving, how many servings a day you take, and roughly how long you have been taking it. If that sounds fiddly, a clear photo of each label, plus how often you take it, covers almost everything a clinician needs. Bring it to appointments where a new medicine or a procedure is on the table.