Which Supplements Interact With Your Medications? A Pharmacist’s Guide, Bottle by Bottle (and the Warning Already Printed on Your Label)

Last Reviewed: October 13, 2026

As a pharmacist and a mom of three, I know most people never think to mention their supplements at the pharmacy counter, and those bottles are where a lot of interactions hide. This guide goes supplement by supplement through the ones that interact with medications, and tells you which combinations to space out, which to avoid, and which are mostly fine. It also shows you where the warning already sits on a Canadian label.

A patient came to the pharmacy to pick up a new prescription for doxycycline, an antibiotic, for acute rhinosinusitis (a sinus infection). He’s allergic to amoxicillin, so doxycycline was the choice this time, and he asked me to walk him through the new medication.

While we were chatting, he mentioned that he takes a multivitamin.

That detail changed the counselling. Most multivitamins contain calcium, iron, magnesium, or zinc, and those minerals bind to doxycycline in the gut, so less of the antibiotic gets absorbed. I counselled him to take his multivitamin at least two hours before his doxycycline, or at least four hours after it.

The lesson here is not to skip or delay an antibiotic dose to make room for a supplement. Take the antibiotic exactly as prescribed, and move the supplement instead. A multivitamin doesn’t feel like a medication, which is exactly why it’s easy to leave off the list. Here is how I sort the supplements that matter.

On One of These Medications? Start Here

Scroll sideways to view the full table if needed.

How I Sort Supplement Interactions

Supplement interactions sound like one big category. At the counter, I sort them into three.

Stop and ask first. The supplement changes how your body handles the medication, or adds to its effect. Whether it’s safe depends on exactly which medication you take, so this is a conversation before you start, not after.

Space it out. The supplement binds to the medication in your gut, and a few hours of distance usually solves it.

Usually fine, but tell your pharmacist. The risk is small for most people and rises with certain medications, usually blood thinners.

None of these buckets means “never.” Each one tells you what kind of conversation to have.

Stop and Ask First

Vitamin C

If you take an amphetamine-based ADHD medication, such as Vyvanse or Adderall XR, tell your pharmacist about any vitamin C supplement. The prescribing information for these medications cautions that vitamin C can lower amphetamine levels, and Vyvanse’s Canadian patient information names vitamin C among the products that may interact with it. The labels don’t say how much vitamin C it takes to matter, and the details differ from one medication to the next.

Don’t stop your vitamin C or change your medication dose on your own. If your stimulant seems to wear off early or isn’t working the way it used to, bring your full supplement list to your pharmacist and prescriber.

St. John’s Wort

St. John’s Wort is the supplement I flag most firmly. It speeds up how your liver clears a long list of medications, and it can add to the effects of others.

Health Canada’s monograph for St. John’s Wort sets the label wording licensed products must carry. Its “Do not use if” statement covers people taking antidepressants, anti-anxiety medications, cancer medications, cardiovascular medications, hormonal birth control, blood thinners, HIV medications, and medications that suppress the immune system. It also tells you to ask a health care practitioner before use if you take seizure medications, antihistamines, bronchodilators, muscle relaxants, or opioids, and to stop and get help if you develop muscle rigidity or contractions, tremors, agitation or confusion, or a racing heart. “Blood thinners” includes the newer ones: Thrombosis Canada advises people taking apixaban, rivaroxaban, dabigatran, or edoxaban to avoid St. John’s Wort, because it may lower the levels of those medications.

Two combinations matter most for women. With an antidepressant such as an SSRI (selective serotonin reuptake inhibitor), St. John’s Wort can cause serotonin syndrome, a medical emergency. With hormonal birth control, it can lower the levels of the contraceptive hormones. Studies have found more breakthrough bleeding and, in one study, signs of ovulation, and the UK’s medicines regulator has received reports of unplanned pregnancies in women using the pill and the contraceptive implant. It applies its warning to all hormonal birth control except intrauterine devices, for which there’s no data. I walk through the antidepressant combination alongside other everyday pairings in my guide to drug interactions hiding in plain sight.

Vitamin K

Vitamin K works directly against warfarin, which is why people on warfarin often hear they should avoid it. British Columbia’s provincial warfarin guideline takes a different position: very high intake from food or supplements can blunt warfarin’s effect, but patients don’t need to avoid or limit vitamin K. The goal is a steady intake without big swings from day to day.

That makes a new supplement the thing to watch. Meal-replacement drinks can be high in vitamin K, and many supplements list it on the label, so starting or stopping one can shift your INR (international normalized ratio, the blood test that measures how warfarin is working). Tell your pharmacist and whoever manages your warfarin before you start or stop any product that contains vitamin K.

However, vitamin K’s effect is specific to warfarin. Thrombosis Canada notes that, unlike warfarin, the newer blood thinners (apixaban, rivaroxaban, dabigatran, and edoxaban) have no known dietary interactions. The other supplements in this post that affect bleeding, such as ginkgo, turmeric, and fish oil, still matter with them.

Ginkgo

Health Canada’s ginkgo monograph is one of the clearest labels in the supplement aisle. For example, its “Do not use if” statements cover anyone taking blood thinners or other health products that affect blood clotting, and anyone having surgery. It also tells you to ask a health care practitioner first if you take diabetes, high blood pressure, or seizure medications.

Turmeric and Curcumin

Turmeric in your cooking is not the concern here. However, concentrated turmeric and curcumin supplements are. Specifically, Health Canada’s monograph for concentrated turmeric extracts says to ask a health care practitioner before use if you take medications including blood thinners. Thrombosis Canada goes further for the newer blood thinners: it advises that supplements linked to bleeding risk, naming curcumin (turmeric) and garlic supplements, should generally be avoided. The Health Canada label also carries a liver warning, added after a 2025 safety review: stop and check with a health care practitioner if you notice yellowing of your eyes or skin, dark urine, nausea, vomiting, or stomach pain.

Ashwagandha

Ashwagandha is marketed for stress and sleep, and it may interact with thyroid hormone, diabetes medications, blood pressure medications, immunosuppressants, sedatives, and anti-seizure medications. Most of these interactions are theoretical, based on how ashwagandha behaves in early research rather than on reported cases in people. The thyroid concern is the one to know about if you take levothyroxine: preliminary evidence suggests ashwagandha may boost your body’s own thyroid hormone production, adding to your prescribed dose and potentially shifting your thyroid test results. Don’t expect the Canadian label to flag any of this: Health Canada’s ashwagandha monograph warns about drowsiness and use in pregnancy or breastfeeding, but names none of these medications. Ask your pharmacist before starting it with any of them.

Melatonin

Melatonin feels harmless because it’s sold for sleep. Health Canada’s melatonin monograph sets the warnings licensed products carry. They tell you to ask a health care practitioner before use if you take medications for seizures, blood pressure, suppressing the immune system, affecting mental state or increasing sedation, as well as steroids or blood thinners. The same labels also tell you to avoid alcohol and other products that cause drowsiness, and not to drive or use machinery for five hours after taking it. For children, the rules changed in 2026; see Melatonin and Kids in Canada below.

Space It Out (Timing Fixes It)

Calcium, iron, magnesium, and zinc are minerals, and minerals can bind to certain medications in your gut. The bound pair passes through without being absorbed, so the medication does less than it should. Distance fixes this in most cases, and multivitamins count, since most contain several of these minerals at once.

Calcium

If you take levothyroxine, calcium is one of the most common reasons a dose that used to work seems to stop working. In a small study of healthy adults, calcium carbonate, calcium citrate, and calcium acetate each cut levothyroxine absorption by roughly 20 to 25% when taken at the same time, and by about half or more in a few people. Keep them at least four hours apart, and tell your prescriber or pharmacist when you start or stop a calcium supplement, since either change can shift your thyroid levels. If your TSH (thyroid-stimulating hormone) has crept up without a clear reason, my guide to what your thyroid labs actually mean explains what that number is telling you.

Calcium also binds to certain antibiotics. With doxycycline and other tetracyclines, take calcium at least two hours before the antibiotic, or at least four hours after it. The interaction reference I use at work goes further: it advises avoiding the combination where possible, reports that magnesium and zinc can cut tetracycline levels by as much as 40 to 50%, and notes the antibiotic may still be less effective even with spacing. For a short course, ask your pharmacist whether pausing your mineral supplement until you finish makes sense. Ciprofloxacin runs the other way: take the antibiotic at least two hours before, or six hours after, any calcium supplement. Other quinolones each have their own window: levofloxacin needs two hours on either side, and moxifloxacin four hours before or eight hours after. For any other antibiotic, ask your pharmacist for yours.

Iron

Iron follows the same rules as calcium: at least four hours from levothyroxine, and the same antibiotic windows. With antibiotics especially, iron is one of the strongest binders: taken together, it cut doxycycline and minocycline absorption by 77 to 90% in studies. Calcium and iron also compete with each other, so taking them together shortchanges your iron. If you’re taking iron because your bloodwork showed you’re low, my iron supplementation guide covers how to take it so it actually absorbs.

In a small study of people on stable levothyroxine doses, adding a daily iron supplement raised TSH, and most of them developed hypothyroid symptoms again. Stopping iron also matters: if your levothyroxine dose went up while you were taking iron, stopping the iron can leave you with more thyroid hormone than you need. Tell your prescriber or pharmacist when you stop iron, not only when you start it.

Magnesium

Magnesium matters less for levothyroxine than calcium or iron. In a 2025 trial in healthy adults, taking levothyroxine together with magnesium aspartate lowered absorption by about 12%, and with magnesium citrate by about 7%, which the researchers didn’t consider meaningful. A major drug interaction database rates it as a combination to monitor, with spacing as an option rather than a rule. Keeping magnesium a few hours away from your thyroid dose is still an easy habit. Magnesium antacids and laxatives, such as magnesium hydroxide or magnesium oxide, are a separate case: the same database suggests keeping those four hours away from your thyroid dose.

The antibiotic rule carries over as well. With doxycycline, take magnesium at least two hours before or four hours after the antibiotic; with ciprofloxacin, take the antibiotic at least two hours before or six hours after the magnesium.

Zinc

Zinc lozenges and supplements get popular every cold season, which is also antibiotic season. It can lower the absorption and effect of certain antibiotics, including cephalexin, tetracyclines, and quinolones. The timing depends on the antibiotic. With doxycycline, take zinc at least two hours before or four hours after it; with ciprofloxacin, take the antibiotic at least two hours before or six hours after the zinc. For anything else, ask your pharmacist to map out the window.

Probiotics

Probiotics and antibiotics can work together, but not in the same swallow. That’s because antibiotics kill bacteria, including the live bacteria in your probiotic. Health Canada’s probiotics monograph tells licensed bacterial probiotics to be taken at least two to three hours before or after an antibiotic. Yeast-based probiotics, such as Saccharomyces boulardii, are exempt from that rule; for those, the two-to-three-hour gap applies to antifungal medications instead. In other words, the spacing protects the probiotic, not the antibiotic or antifungal.

A Simple Daily Schedule

If you take levothyroxine, build your day around it. Take it first thing in the morning on an empty stomach with water, and wait before breakfast and coffee. Save calcium, iron, magnesium, and your multivitamin for later in the day, at least four hours after your thyroid dose. Evening, for example, works well for most people.

On an antibiotic as well? Count the antibiotic windows separately. With doxycycline, minerals go at least two hours before the antibiotic or at least four hours after it. Other antibiotics have their own windows, so ask your pharmacist to map it out if the doses start to crowd your day. It’s a short conversation, and it’s worth having.

Usually Fine, But Tell Your Pharmacist

Fish Oil and Omega-3s

For most people, fish oil doesn’t interact with their medications in any meaningful way. If you take a blood thinner or an NSAID (nonsteroidal anti-inflammatory drug, such as ibuprofen or naproxen), mention it to your pharmacist before you start, because fish oil can slow how quickly a cut stops bleeding. This is one interaction you won’t find on a Canadian label: Health Canada’s monograph for fish oil products doesn’t require a blood thinner warning, so it’s a conversation, not a label check.

Vitamin E

Vitamin E belongs in the same conversation. It may add to the effect of blood thinners, including warfarin and newer ones such as apixaban and rivaroxaban. The evidence is mixed: case reports describe bleeding after people on warfarin started vitamin E, while other studies found no change. That’s why the clinical interaction reference I rely on rates it as a combination to monitor rather than avoid. If you take a blood thinner, mention vitamin E to your pharmacist before adding it, and watch for unusual bruising or bleeding.

Melatonin and Kids in Canada: What Changed in June 2026

On June 2, 2026, Health Canada changed the Prescription Drug List so that melatonin sold for sleep in children and adolescents under 18 is now a prescription drug.

No natural health product (NHP) containing melatonin is authorized for children in Canada. Every licensed melatonin NHP is for adults only. One prescription melatonin product is authorized for children with specific conditions.

If your child has trouble sleeping, talk to their health care provider or your pharmacist about what’s appropriate. Health Canada’s reasoning was that a practitioner should first rule out other causes of the sleep problem, make sure better sleep habits have been tried, and choose the right dose for your child’s age, health, and other medications. The change doesn’t affect adult melatonin products, which stay on the shelf. They just aren’t authorized for children.

The Warning Is Already on Your Label

What an NPN Tells You, and What It Doesn’t

Licensed natural health products in Canada carry an eight-digit Natural Product Number (NPN). It means Health Canada has reviewed the product for safety, quality, and the claims on its label. However, it doesn’t mean the product is safe with your particular medications. That part is still your conversation with your pharmacist.

Finding the Interaction Warning

In fact, Canadian labels do something most people never notice. Health Canada monographs set the risk statements a licensed product must print, so the interaction warning is often already on the bottle. Look for three phrases: “Do not use if,” “Ask a health care practitioner before use if,” and “Stop use and ask a health care practitioner if.” So those lines are where the interactions in this post live.

You can also look up any NPN in Health Canada’s Licensed Natural Health Products Database, which shows the licensed risk information for that exact product.

Why Two Bottles May Look Different Until 2028

Every licensed NHP label must already list its warnings, contraindications, and possible side effects. Newer labels go further, with a standardized Product Facts table, labelling of priority allergens, and larger, higher-contrast print. Products currently have until June 2028 to switch, and Health Canada plans to propose a longer transition period in 2027, so you’ll see both old and new labels on the shelf for years. The risk information is on both. It’s just easier to find on the new ones.

One more label to know about: biotin isn’t an interaction, but high-dose biotin can make thyroid and cardiac lab results come back falsely abnormal. I cover it in the supplements women actually need (and the ones you can skip).

How to Choose a Supplement You Can Safely Add

When you add a supplement to a medication routine, the product matters less than how you check it. This is what I look for:

• An NPN on the label. No NPN means no Health Canada review, and no licensed risk statements to read.
• A single ingredient over a blend. Blends make it harder to spot the one ingredient that interacts with your medication.
• The “Risk information” section. Read it against your medication list before you buy.
• Minerals hiding in multivitamins. Check the ingredients for calcium, iron, magnesium, and zinc if you take levothyroxine or an antibiotic.
• A dose that matches the label’s directions. More is not safer, and several warnings in this post are dose-related.
• One pharmacy for everything. Your pharmacist can only catch an interaction with a product they know about.

Red Flags: When to Call, When to Go In

Call 911 or go to the emergency department if you have agitation, a racing heart, heavy sweating, tremor, muscle rigidity, high fever, or confusion after combining St. John’s Wort with an antidepressant. The same applies to vomiting blood, black or tarry stools, or bleeding that won’t stop while you take a blood thinner.

Call your pharmacist or prescriber the same day if you notice unusual bruising or nosebleeds after starting a supplement with a blood thinner, or if your thyroid or ADHD medication seems to have stopped working. Don’t adjust the dose yourself.

Call the Poison Centre if your child swallows any supplement, especially one containing iron. If your child is unconscious, not breathing, or having a seizure, call 911 instead. The number is 1-844-POISON-X (1-844-764-7669). Quebec callers can reach the Centre antipoison du Québec at 1-800-463-5060, and Nunavut residents should contact their local health centre. More than a third of the cases Canada’s poison centres handled in 2020 involved a child aged 5 or under, so save the number in your phone today.

For non-urgent questions after hours, call your health line at 811 (in Quebec, choose option 1 for Info-Santé). In Manitoba, call Health Links – Info Santé at 1-888-315-9257 (204-788-8200 in Winnipeg). In Nunavut, contact your local health centre. Not sure whether it’s an 811 call or a trip in? My guide to ER vs. urgent care for a sick child in Canada walks through which door to use.

If you’re not sure whether a combination is a problem, this is all you need to say at the counter:

I take [medication], and I’d like to start [supplement]. Can you check whether they interact, and if they do, how I should time them?

Quick Reference

• Calcium and iron: at least four hours from levothyroxine.
• Magnesium: a smaller effect on levothyroxine; a few hours apart is still a good habit, and four hours for magnesium antacids and laxatives.
• Calcium, iron, magnesium, zinc with doxycycline: take the mineral at least two hours before or four hours after the antibiotic. For other antibiotics, ask your pharmacist for the window.
• Probiotics: bacterial ones at least two to three hours from your antibiotic; yeast-based ones (Saccharomyces boulardii) at least two to three hours from antifungals.
• St. John’s Wort: don’t combine with antidepressants, birth control, blood thinners, and several other medications. Ask first.
• Vitamin K: keep your intake steady on warfarin; don’t start or stop a supplement without telling your care team.
• Ginkgo: not with blood thinners, and not before surgery.
• Turmeric, melatonin, ashwagandha: ask first if you take any medication listed in their sections above.
• Vitamin C: tell your pharmacist and prescriber if you take an amphetamine-based ADHD medication.
• Melatonin for kids: prescription only in Canada since June 2, 2026.
• Your label: look for “Do not use if” and “Ask a health care practitioner before use if.”

Clinical Mama Takeaway

My patient did the most useful thing a person can do with a new prescription: he asked to be counselled. A multivitamin he mentioned in passing became part of that conversation, and it changed how he took his antibiotic.

That’s the habit I want you to take from this post. Keep one list of every medication, vitamin, and supplement you take, and bring it to your pharmacist whenever something changes. Most interactions are solved with timing or a swap. Still, the ones that aren’t are why the list exists.

❓Frequently Asked Questions

📚References

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2. Health Canada. (2024). Natural Health Product: St. John’s Wort, Hypericum perforatum, Oral (monograph dated July 26, 2024). Accessed from https://webprod.hc-sc.gc.ca/nhpid-bdipsn/dbImages/mono_st-johns-wort–oral_english.pdf
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