When you’re preparing for an IVF, IUI, or egg freezing cycle, things move fast. One day you’re starting stimulation injections, the next you’re prepping for a trigger shot or adjusting your progesterone. It’s a lot for your body to navigate.
You may have added a few supplements to your routine because you want to do everything possible to improve your egg or sperm quality. Perhaps you’ve done your own research or changed one of your staples to try and move the needle. But once you introduce fertility medications, the game changes completely. The wrong dose or form of a nutrient can interact with your protocol or reduce treatment outcomes.
As fertility-focused NDs, our job is to do a deep dive into your protocol to make sure your natural supports are helping, not hindering. We want to avoid avoidable hiccups—like thinned blood before a procedure, skewed lab results, or supplements that accidentally compete with your prescriptions.
The best rule of thumb is simple: share your full list—including teas, tinctures, and those “just sometimes” products—with your medical team.
Below are 10 of the most common interactions we see come up around fertility treatment.
1) Omega-3 (fish oil) + blood thinners (aspirin, heparin/enoxaparin)
Why it matters: Omega-3s can have mild antiplatelet effects. When combined with antiplatelet/anticoagulant meds used in some IVF protocols, this may increase bruising or bleeding risk—particularly around procedures (egg retrieval) or if you’re already prone to nosebleeds/heavy bleeding.
What to do: Don’t guess—ask your clinic whether to continue, lower the dose, or pause omega-3s ahead of retrieval/transfer.
2) High-dose vitamin E + anticoagulants/antiplatelets
Why it matters: Vitamin E at higher supplemental doses can increase bleeding tendency in some people, and that effect can add to aspirin or heparin-type medications.
What to do: If you’re taking vitamin E separately (beyond what’s in a prenatal), confirm the dose with your care team. This is a common “we didn’t realize it was in that product” scenario.
3) Turmeric/curcumin supplements + anticoagulants/antiplatelets (and sometimes diabetes meds)
Why it matters: Concentrated curcumin supplements (not normal culinary use) may increase bleeding risk when combined with aspirin/heparin. Curcumin may also affect blood sugar, which can matter if you’re on metformin or other glucose-lowering meds.
What to do: Culinary turmeric is usually fine; the question is the capsule dose. Many clinics prefer pausing higher-dose herbal concentrates around procedures.
4) Garlic supplements + anticoagulants/antiplatelets
Why it matters: Garlic in supplement form (again, not typical food amounts) can have antiplatelet effects. Combined with blood thinners it may increase bruising/bleeding.
What to do: If you take garlic for cholesterol or immunity, flag it specifically. It’s common for it to be overlooked because it feels “food-like.”
5) Ginkgo / ginseng + anticoagulants/antiplatelets (and sometimes stimulant-like effects)
Why it matters: Ginkgo is associated with increased bleeding risk, especially when combined with aspirin/heparin. Ginseng may also affect bleeding risk and can feel stimulating for some people—relevant if you’re already dealing with IVF-related sleep disruption or anxiety.
What to do: These are classic “pause-before-procedure” supplements in many medical settings. Confirm timing with your clinic.
6) St. John’s wort + many prescription meds (including hormones and mood meds)
Why it matters: St. John’s wort can increase the activity of certain liver enzymes/transporters (notably CYP3A4 and P-gp), which can lower blood levels of many medications. It also interacts with SSRIs/SNRIs and other serotonergic meds, raising the risk of serotonin-related side effects.
Even when IVF hormones aren’t “metabolized like the pill” in a simple way, St. John’s wort is still a red flag because it can complicate medication levels and side effects across the board.
What to do: If you use St. John’s wort for mood, don’t stop abruptly without a plan—bring it to your prescribing clinician and fertility team promptly. There are safer, better-monitored options.
7) CBD products + anesthesia/sedatives (egg retrieval) and other meds metabolized by the liver
Why it matters: Egg retrieval typically involves sedation/anesthesia. CBD can interact with sedatives and other medications via liver enzyme pathways, and it can also change how drowsy you feel. The biggest issue is safety and predictability around anesthesia and recovery.
What to do: Tell your clinic and anesthesia team if you use CBD/THC products—even occasionally. They’ll advise whether to pause and for how long before retrieval.
8) Melatonin + sedatives (and other sleep/anxiety meds)
Why it matters: Melatonin is common in fertility supplement stacks. It can increase drowsiness when combined with sedating antihistamines, benzodiazepines, sleep meds, or anesthesia-related medications used around retrieval.
What to do: If you’re using melatonin, note the dose and timing, and confirm what to do in the 24–48 hours around retrieval. This is usually straightforward once the team knows.
9) Iron, calcium, magnesium (and prenatal minerals) + thyroid medication (levothyroxine)
Why it matters: Many people in fertility care take the thyroid medication levothyroxine (or have thyroid optimization goals). Iron, calcium, and magnesium can bind thyroid hormone in the gut and reduce absorption, which can shift TSH/T4 and make thyroid dosing feel inconsistent—right when you want stability.
What to do: Separate thyroid medication from mineral-containing supplements by a consistent window (often 4 hours, but follow your prescriber’s instructions). This one change can make thyroid labs and symptoms much more stable.
10) Biotin (often in “hair/skin/nails” formulas) + fertility and thyroid lab tests
Why it matters: Biotin doesn’t “fight” IVF meds—but it can interfere with some lab immunoassays. In fertility care, that can matter because monitoring relies on labs like TSH/thyroid markers and sometimes hormone assays. Biotin interference can cause results that look falsely high or low, leading to confusion or unnecessary medication changes.
What to do: If you take biotin (especially higher-dose hair/skin/nails products), tell your clinic before bloodwork. Many labs recommend holding biotin for a period before testing—your team can advise what’s appropriate for your dose and lab.
Practical next steps (so this doesn’t become “one more thing”)
- Bring a single list to your IVF nurse/REI team: product name, brand, dose, and how often you take it.
- Ask specific questions:
- “Should I pause anything before egg retrieval or transfer—and when?”
- “Could any of these affect my labs (thyroid, hormones) or bleeding risk?”
- Avoid last-minute changes if you can. If something needs to be stopped, your team will tell you how to do it safely.
How to Coordinate Your Care
Managing these interactions doesn’t have to be overwhelming. The best approach is to work with a team that understands both the naturopathic and the conventional sides of fertility medicine.
If you are currently TTC, preparing for a cycle or are in the middle of fertility treatments, our fertility-focused NDs can help you audit and adjust your supplement protocol for the best outcomes.
Book a consultation with a naturopathic doctor at Conceive Health to create a safe, evidence-based plan tailored to your upcoming treatment.
