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Dietary supplement

Osta XL Ingredients & Drug Interactions

by Hardcore Anabolics

Osta XL label
See full label image
Capsule Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Osta XL against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Osta XL is a dietary supplement by Hardcore Anabolics with 1 active ingredient. Its ingredients are commonly taken for muscle building, athletic performance, fat loss / body recomposition.Based on those ingredients, 611 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are (2S)-3-(4-Cyanophenoxy)-N-[4-Cyano-3-(Trifluoromethyl)phenyl]-2-Hydroxy-2-Methylpropanamide. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Osta XL by Hardcore Anabolics

Ask about any prescription or over-the-counter medication and we check it for interactions with Osta XL by Hardcore Anabolics — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Osta XL by Hardcore Anabolics

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • “Osta XL Blend” is a proprietary blend — the label doesn't break down how much of each component you get.

Osta XL contains one active ingredient: ostarine, a selective androgen receptor modulator (SARM) — a research compound designed to target muscle and bone tissue. The product also includes inactive ingredients: gelatin, silica, and magnesium stearate, which are standard capsule materials and binders.

Does it work?

Not established
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not established

The graded evidence we hold for these ingredients covers different conditions than the ones this product is marketed for, so there's no established rating for its stated use — see Ostarine's own graded uses on its monograph.

Why this rating?
  • The label markets this product for: Maximizes muscle and strength.
  • We looked for evidence on: Athletic performance, Cachexia, Muscular dystrophy, Sarcopenia, Muscle wasting, Strength loss — and 1 related terms.
  • The closest evidence on file: Ostarine is rated "Insufficient Reliable Evidence To Rate" for Athletic performance (Natural Medicines).
  • Also on file: Ostarine is rated "Insufficient Reliable Evidence To Rate" for Cachexia, Muscular dystrophy, Sarcopenia.

The evidence for ostarine is not established in our data. We hold insufficient reliable evidence to rate its use for athletic performance, muscle loss (cachexia), muscle weakness in older age (sarcopenia), muscular dystrophy, or breast cancer.

In short, we don't have solid clinical proof that it works for any of these.

The evidence, ingredient by ingredient Ostarine

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Ostarine is an unapproved investigational drug — it has never been cleared by the FDA. The facts show it carries documented safety risks.

The most common side effects are abdominal pain, loss of appetite, constipation, diarrhea, and nausea. Some people also experience a rise in liver enzymes (ALT); in studies, this happened in roughly 4–21% of users depending on dose, though levels usually came back down.

Serious liver damage (hepatotoxicity) is rare but possible. Ostarine also affects hormone pathways and must be avoided during pregnancy; there is no safety data for breastfeeding, so it should be avoided then too.

Side effects, ingredient by ingredient Ostarine

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Ostarine.
  • The most serious interaction on file is rated Moderate.
  • For scale: 612 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before taking Osta XL, check with your pharmacist if you take any drugs that affect the liver (hepatotoxic drugs), drugs that speed up liver metabolism (CYP3A4 inducers like rifampin), drugs that slow liver metabolism (CYP3A4 inhibitors), probenecid (Benemid), or drugs broken down by CYP2C9. These interactions span hundreds of medications — use the search tool on this page to check your exact prescriptions.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

Osta XL is an unapproved, research-stage compound with no FDA clearance and a track record of liver enzyme changes. If you're considering it, talk to your pharmacist or doctor first — especially if you take any medications, have liver concerns, or are pregnant or breastfeeding.

The evidence for its effectiveness simply isn't there yet.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jan 25, 2020.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Osta XL, straight from the product label.

Brand Hardcore Anabolics
Net contents 0 Not Present
Market status On market
Date entered into DSLD Jan 25, 2020
DSLD ID 211519
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Osta XL by Hardcore Anabolics, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
2 Capsule(s)
Maximum serving Sizes:
2 Capsule(s)
Servings per container
60
IngredientAmount% DV
Osta XL Blend0 NP--
(2S)-3-(4-Cyanophenoxy)-N-[4-Cyano-3-(Trifluoromethyl)phenyl]-2-Hydroxy-2-Methylpropanamide10 mg--

Other ingredients: Gelatin, Silica, Magnesium Stearate

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formulation

Maximizes muscle and strength

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Osta XL by Hardcore Anabolics label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Osta XL label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Osta XL by Hardcore Anabolics

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size2 Capsule(s) Dosage formCapsule Servings per container60 Amounts shown are per serving.

Other (inactive) ingredients: Gelatin, Silica, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

Osta XL by Hardcore Anabolics Drug Interactions

Want to check YOUR meds against Osta XL?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
611Drugs
440 Moderate 171 Minor

Ingredients driving the most interactions

(2S)-3-(4-Cyanophenoxy)-N-[4-Cyano-3-(Trifluoromethyl)phenyl]-2-Hydroxy-2-Methylpropanamide 611

Individual Drug Interactions

The ingredients in Osta XL interact with 611 drugs. Click any drug to see the details.

1 of the 1 ingredient in Osta XL interact with drugs. Each result below shows which ingredient is responsible. (2S)-3-(4-Cyanophenoxy)-N-[4-Cyano-3-(Trifluoromethyl)phenyl]-2-Hydroxy-2-Methylpropanamide

Each ingredient & the kinds of drugs it affects

For each ingredient in Osta XL with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

(2S)-3-(4-Cyanophenoxy)-N-[4-Cyano-3-(Trifluoromethyl)phenyl]-2-Hydroxy-2-Methylpropanamide6 drug types · 611 drugs

Cytochrome P450 3A4 (Cyp3A4) Inducers

Theoretically, concomitant use of ostarine with CYP3A4 inducers could decrease the clinical effects of ostarine.
Ostarine is partially metabolized by CYP3A4. Clinical research shows that taking rifampin, a potent inducer of CYP3A4, reduces the maximum plasma concentration of ostarine by 23% and the area under the curve by 43%.

Likelihood Possible Evidence B
Hepatotoxic Drugs

Theoretically, concomitant use with hepatotoxic drugs might increase the risk of adverse hepatotoxic effects.
Some clinical research shows that ostarine can increase alanine aminotransferase, a marker of liver damage, in some patients. Additionally, the U.S. Food and Drug Administration warns that supplements containing SARMs, such as ostarine, have been associated with reports of liver toxicity and there are at least two reports of drug-induced liver injury attributed to the use of ostarine.

Likelihood Possible Evidence D
Probenecid (Benemid)

Theoretically, concomitant use of ostarine with probenecid could increase the effects and adverse effects of ostarine.
Clinical research shows that probenecid increases ostarine levels and slows the clearance of ostarine, likely via inhibition of UDP-glucuronosyltransferase (UGT). Ostarine is partially metabolized by UGT.

Likelihood Possible Evidence B
Rifampin (Rifadin)

Theoretically, concomitant use of ostarine with rifampin could decrease the clinical effects of ostarine.
Clinical research shows that taking rifampin with ostarine reduces the maximum plasma concentration of ostarine by 23% and the area under the curve by 43%. Ostarine is partially metabolized by cytochrome P450 3A4 (CYP3A4), and rifampin is a potent CYP3A4 inducer.

Likelihood Possible Evidence B
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, ostarine might increase levels of drugs metabolized by CYP2C9, although clinical research suggests this is not clinically relevant.
Although in vitro research suggests that ostarine inhibits CYP2C9, more robust clinical research shows that ostarine does not significantly affect CYP2C9.

Likelihood Unlikely Evidence B
Cytochrome P450 3A4 (Cyp3A4) Inhibitors

Theoretically, concomitant use of ostarine with CYP3A4 inhibitors could increase the effects and adverse effects of ostarine, although this is unlikely to be clinically significant.
Ostarine is partially metabolized by CYP3A4. However, clinical research shows that taking itraconazole, a potent inhibitor of CYP3A4, had minimal effects on the levels of ostarine in the body.

Likelihood Unlikely Evidence B
(2S)-3-(4-Cyanophenoxy)-N-[4-Cyano-3-(Trifluoromethyl)phenyl]-2-Hydroxy-2-Methylpropanamide full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Osta XL, from the product label.

Hardcore Anabolics

See all Hardcore Anabolics products
Name
Hardcore Anabolics
Pharmacist Counseling Corner

Osta XL by Hardcore Anabolics: Common Questions

Does Osta XL by Hardcore Anabolics interact with any medications?
Yes. Based on its ingredients, Osta XL has a known interaction with 611 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Osta XL contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What exactly is ostarine?
Ostarine is a selective androgen receptor modulator (SARM) — a laboratory-designed compound meant to target muscle and bone tissue. It's never been approved by the FDA and remains investigational.
Can I take this if I'm pregnant or breastfeeding?
No. Ostarine affects hormone pathways and must be avoided in pregnancy. There's no safety data for breastfeeding, so it should be avoided then as well. Talk to your doctor or pharmacist about alternatives.
What are the most common side effects?
The most common are stomach pain, loss of appetite, constipation, diarrhea, and nausea. Some users also develop a temporary rise in liver enzymes; in studies this occurred in 4–21% of people depending on dose, though it usually resolved on its own.
Does ostarine actually work for building muscle or athletic performance?
We don't have solid evidence to say. Our data shows insufficient reliable evidence to rate ostarine for athletic performance, muscle loss, weakness in older age, muscular dystrophy, or any other condition listed here.
Why is this product unapproved?
Ostarine has never been cleared by the FDA because it remains an investigational drug. The FDA has also warned that supplements containing SARMs like this one carry documented safety risks and lack approval.

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

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Osta XL label
Go deeper

The Full Monographs Behind Osta XL’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Ostarine

Interacts with 611 drugs

Ostarine (also called MK-2866 or enobosarm) is an experimental, unapproved drug known as a SARM (selective androgen receptor modulator), not a true dietary supplement. It is not approved by...

Read the full Ostarine monograph →
Sources

Sources & How We Checked

Osta XL's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 10 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Ostarine 10 references
  1. Warning Letter: Ironmag Labs 10/23/17. FDA Inspections, Compliance, Enforcement, and Criminal Investigations, October 23, 2017. https://www.fda.gov/iceci/enforcementactions/warningletters/2017/ucm582464.htm Accessed: November 1, 2017
  2. Warning Letter: Panther Sports Nutrition 10/23/17. FDA Inspections, Compliance, Enforcement, and Criminal Investigations, October 23, 2017. https://www.fda.gov/iceci/enforcementactions/warningletters/2017/ucm581630.htm. Accessed: November 1, 2017
  3. Warning Letter: Infantry Labs LLC 10/23/17. FDA Inspections, Compliance, Enforcement, and Criminal Investigations, October 23, 2017. https://www.fda.gov/iceci/enforcementactions/warningletters/2017/ucm582685.htm. Accessed: November 1, 2017
  4. Dobs AS, Boccia RV, Croot CC, et al. Effects of enobosarm on muscle wasting and physical function in patients with cancer: a double-blind, randomised controlled phase 2 trial. Lancet Oncol 2013;14(4):335-45. PubMed
  5. Dalton JT, Barnette KG, Bohl CE, et al. The selective androgen receptor modulator GTx-024 (enobosarm) improves lean body mass and physical function in healthy elderly men and postmenopausal women: results of a double-blind, placebo-controlled phase II tri
  6. Coss CC, Jones A, Dalton JT. Pharmacokinetic drug interactions of the selective androgen receptor modulator GTx-024 (enobosarm) with itraconazole, rifampin, probenecid, celecoxib and rosuvastatin. Invest New Drugs 2016;34(4):458-67. PubMed
  7. FDA. FDA Warns against using SARMs in body building products. October 2017. Available at: https://www.fda.gov/newsevents/newsroom/fdainbrief/ucm583021.htm.
  8. Bedi H, Hammond C, Sanders D, Yang HM, Yoshida EM. Drug-induced liver injury from enobosarm (ostarine), a selective androgen receptor modulator. ACG Case Rep J 2021;8(1):e00518. PubMed
  9. Kintz P, Gheddar L, Paradis C, et al. Peroxisome Proliferator-Activated Receptor Delta Agonist (PPAR- d) and Selective Androgen Receptor Modulator (SARM) Abuse: Clinical, Analytical and Biological Data in a Case Involving a Poisonous Combination of GW1516
  10. Weinblatt D, Roy S. Drug-Induced Liver Injury Secondary to Enobosarm: A Selective Androgen Receptor Modulator. J Med Cases 2022;13(5):244-248. PubMed

See these in context on the Ostarine monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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