Medication interaction hub

What Supplements Interact with Finasteride?

Finasteride brand names: Propecia, Proscar. Every interaction below applies to the brands too.

138 Interactions 3 Major 94 Moderate 41 Minor
Curated & coded by · Clinical Pharmacist · Updated September 26, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Finasteride? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Finasteride against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

The supplement list for finasteride (Propecia, Proscar) is one I would read carefully rather than skim, because three of its 138 entries are rated major. Almost everything here works through the same liver enzyme, CYP3A4, that clears finasteride. St. John's wort revs that enzyme up and can drain the drug's level, quietly weakening treatment for an enlarged prostate or hair loss, while grapefruit does the opposite, blocking the enzyme so levels climb and side effects become more likely.

The third major entry is activated charcoal, which can soak up an oral dose before it absorbs. It belongs to a smaller group of 17 ingredients, mostly charcoals and thick fibers like glucomannan, that interfere with absorption and should be spaced well apart from the pill. The remaining 94 moderate and 41 minor entries echo the same enzyme effects with weaker evidence, so start with those three majors and work down.

— , Clinical Pharmacist · July 18, 2026

Major 3 Moderate 94 Minor 41 No known interaction 1,314

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Most Viewed Ingredient Interactions

Finasteride: Top Interactions at a Glance

The Finasteride supplement & herbal interactions people checked most in the last 24 hours, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 138 interacting ingredients — plus 1,314 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Finasteride Combinations Today

The Finasteride + supplement pages people viewed most in the last 24 hours (resets at midnight). Open any card for the full report.

Minor Likelihood Unlikely Delta-9-tetrahydrocannabinol (thc) + Finasteridei

Theoretically, THC may increase the levels and clinical effects of CYP3A4 substrates.

Read the full interaction Moderate Likelihood Possible Berberine + Finasteridei

Theoretically, berberine might increase serum levels of drugs metabolized by CYP3A4.

Read the full interaction Moderate Likelihood Possible Bitter Orange + Finasteridei

Bitter orange might increase levels of drugs metabolized by CYP3A4.

Read the full interaction Minor Likelihood Unlikely Green Tea + Finasteridei

Green tea is unlikely to produce clinically significant changes in the levels and clinical effects of CYP3A4 substrates.

Read the full interaction Minor Likelihood Possible Ashwagandha + Finasteridei

Theoretically, ashwagandha might decrease the levels and clinical effects of CYP3A4 substrates.

Read the full interaction Minor Likelihood Possible Vitamin D + Finasteridei

Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.

Read the full interaction
The complete list

Every Supplement Checked Against Finasteride

All 1,452 ingredients in our database, ranked by severity — 138 with a Finasteride interaction on file and 1,314 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Finasteride?

One-line answers, one card per combination — scroll through today’s 20 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Delta-9-tetrahydrocannabinol (thc) with Finasteride?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, THC may increase the levels and clinical effects of CYP3A4 substrates.

Full Delta-9-tetrahydrocannabinol (thc) + Finasteride answer

Can you take Berberine with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, berberine might increase serum levels of drugs metabolized by CYP3A4.

Full Berberine + Finasteride answer

Can you take Bitter Orange with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Bitter orange might increase levels of drugs metabolized by CYP3A4.

Full Bitter Orange + Finasteride answer

Can you take Green Tea with Finasteride?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Green tea is unlikely to produce clinically significant changes in the levels and clinical effects of CYP3A4 substrates.

Full Green Tea + Finasteride answer

Can you take Ashwagandha with Finasteride?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, ashwagandha might decrease the levels and clinical effects of CYP3A4 substrates.

Full Ashwagandha + Finasteride answer

Can you take Clove with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use of clove may increase levels of drugs metabolized by CYP3A4.

Full Clove + Finasteride answer

Can you take Coleus with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking coleus might decrease serum levels of drugs metabolized by CYP3A4.

Full Coleus + Finasteride answer

Can you take Corydalis Yanhusuo with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Corydalis yanhusuo might increase serum levels of drugs metabolized by CYP3A4.

Full Corydalis Yanhusuo + Finasteride answer

Can you take Cranberry with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cranberry might increase the levels and adverse effects of CYP3A4 substrates.

Full Cranberry + Finasteride answer

Can you take Cubebs with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Several compounds isolated from cubebs can inhibit cytochrome P450 3A4 (CYP3A4) in vitro.

Full Cubebs + Finasteride answer

Can you take Danshen with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Danshen might alter the levels and clinical effects of drugs metabolized by CYP3A4.

Full Danshen + Finasteride answer

Can you take Devil's Claw with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, devil's claw might increase levels of drugs metabolized by CYP3A4.

Full Devil's Claw + Finasteride answer

Can you take Dhea with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, DHEA might increase the levels of drugs metabolized by CYP3A4.

Full Dhea + Finasteride answer

Can you take Diosmin with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Full Diosmin + Finasteride answer

Can you take Echinacea with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Echinacea may induce hepatic CYP3A4 and inhibit intestinal CYP3A4.

Full Echinacea + Finasteride answer

Can you take Eucalyptus with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, eucalyptus might increase the levels of CYP3A4 substrates.

Full Eucalyptus + Finasteride answer

Can you take European Barberry with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, European barberry might increase the levels and clinical effects of CYP3A4 substrates.

Full European Barberry + Finasteride answer

Can you take Evodia with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, evodia might increase the levels and clinical effects of CYP3A4 substrates.

Full Evodia + Finasteride answer

Can you take False Unicorn with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. In vitro, false unicorn extract inhibits cytochrome P450 3A4 (CYP3A4) activity.

Full False Unicorn + Finasteride answer

Can you take Fennel with Finasteride?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fennel might increase levels of drugs metabolized by CYP3A4.

Full Fennel + Finasteride answer
Read the list like a pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Finasteride is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Finasteride, and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Finasteride sits in 3 interaction categories. Open any one to see what the group means:

Cytochrome P450 3A4 (Cyp3A4) Substrates 121 ingredients

A drug-metabolism group: these medications are processed by the named liver enzyme (a cytochrome P450). Supplements that speed this enzyme up or slow it down can lower or raise the medication's levels in your body.

121 of the supplement ingredients on this page reach Finasteride through this category.

Oral Drugs 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Finasteride through this category.

Finasteride (Proscar, Propecia) 1 ingredient

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

1 of the supplement ingredient on this page reaches Finasteride through this category.

About Finasteride

Finasteride is a 5-alpha reductase inhibitor used to treat enlarged prostate or male pattern hair loss.

Generic name: Finasteride  ·  Brand names: Propecia, Proscar.

See the full Finasteride drug information
Check a real product

Take a Supplement Product? Check the Whole Bottle Against Finasteride

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Finasteride.

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Pharmacist Counseling Corner

Finasteride & Supplements: Common Questions

What supplements interact with Finasteride?
Our database currently documents 138 ingredients with a known Finasteride interaction (3 major, 94 moderate, 41 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 138. The highest-ranked right now: Grapefruit, Activated Charcoal, St. John's Wort.
Which Finasteride supplement interactions are the most serious?
The 3 major-rated combinations — led by Grapefruit, Activated Charcoal and St. John's Wort — deserve real caution: these are the ones generally best avoided, or used only with your prescriber watching. If you take any of them today, don't panic and don't stop anything abruptly — call your pharmacist first. Jump to the ranked list.
Can I take vitamins or supplements while on Finasteride?
Plenty of supplements coexist fine with Finasteride; a shorter list does not. Rather than memorizing it, check the specific ingredients on your labels — the ranked list above covers every one we've checked, and multi-ingredient products can be checked label-by-label with our scanner. Try the label scanner or the interaction checker.
Do brands like Propecia have the same supplement interactions as Finasteride?
Yes — Propecia, Proscar all contain Finasteride, so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
What about Finasteride and my other medications?
This page covers Finasteride against supplements and herbal ingredients. Checking Finasteride against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker, or read the full Finasteride drug information.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

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Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of September 26, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.