Drug & supplement interaction

Oleic Acid + Testosterone Undecanoate

Testosterone Undecanoate brand names: Andriol, Aveed, Jatenzo, Kyzatrex.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Oleic Acid and Testosterone Undecanoate in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Oleic Acid and Testosterone Undecanoate

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Testosterone Undecanoate and Oleic Acid in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Oleic Acid safety at a glance

Oleic Acid overall Generally safe Generally recognized as safe when consumed in normal amounts from foods like olive oil.
Pregnancy Use caution Amounts found in foods are fine, but concentrated supplements are not well studied in pregnancy.
Breastfeeding Use caution Food amounts are considered safe, but supplement-level doses lack good safety data.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Testosterone Undecanoate and Oleic Acid? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Testosterone Undecanoate

Interactions in our licensed database are recorded against drug classes, not just single drug names. Testosterone Undecanoate is filed under 6 classifications — including androgens, thyroid hormone, hepatotoxic drugs. Oleic Acid has documented interactions with 1 drug class — the most serious being antidiabetes drugs (moderate) — and none of Testosterone Undecanoate’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Oleic Acid Does Interact With Other Medications

Oleic Acid has 86 moderate known drug interactions in our database — Testosterone Undecanoate isn’t one of them. If you take anything else, check it against the full list below.

Moderate 86 No known interaction 2,744 (incl. Testosterone Undecanoate)
Taking anything else?

Check Another of Your Medications Against Oleic Acid

Covers the 2,830 medications we’ve checked against Oleic Acid. Pick one to open its full report.

What to actually watch for

What Testosterone Undecanoate’s Own FDA Label Lists

This is not an interaction — none of it involves Oleic Acid. These are the most notable effects listed in the ADVERSE REACTIONS section of Testosterone Undecanoate’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 10 of them are worth acting on rather than waiting out — marked below.

  • Kidney stones Worth acting on
  • Hearing loss Worth acting on
  • A stroke or mini-stroke Worth acting on
  • Bone thinning Worth acting on
  • Pain or burning when passing urine Worth acting on
  • Low blood sugar Worth acting on
  • A heart attack Worth acting on
  • Blood clots Worth acting on
  • Hallucinations Worth acting on
  • Yellowing of the skin or eyes Worth acting on

Showing the 10 most notable of 54 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Testosterone Undecanoate. Read the label on DailyMed › Where a percentage is shown, it is the share of 1,859 voluntary FDA FAERS reports for Testosterone Undecanoate that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Oleic Acid’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Oleic Acid side to compare — that is a limit of the record, not a statement that Oleic Acid has no side effects.

Overlapping uses

What Testosterone Undecanoate Is Prescribed For, and What Oleic Acid Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Testosterone Undecanoate is a prescription medicine with approved uses on its FDA label. Oleic Acid is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Testosterone Undecanoate is prescribed for: Testosterone injection is primarily used in men whose bodies do not produce enough testosterone on their own — a condition called hypogonadism. This includes primary hypogonadism (a problem with the testicles themselves, such as from injury, infection, or surgery) and hypogonadotropic hypogonadism (caused by problems in the brain's hormone signaling from the hypothalamus or pituitary gland). It is also used to stimulate puberty in carefully selected adolescent males with clearly delayed puberty who have not responded to other support. Testosterone Enanthate Injection is also approved for use in women with advanced, inoperable metastatic breast cancer (specifically skeletal metastases) who are one to five years past menopause, or in premenopausal women with hormone-responsive breast cancer who have had their ovaries removed.

Read the rest of what Testosterone Undecanoate is prescribed for

This use should be directed by an oncologist. Aveed (testosterone undecanoate) is specifically approved for male hypogonadism only.

Oleic Acid has been studied for:

  • Breast cancer studied, not established Oleic Acid has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Oleic Acid for breast cancer

    Population research has found no association between dietary fatty acid intake, including oleic acid, and the risk of breast cancer. The effect of oleic acid supplementation on breast cancer risk is unknown.

    1 source cited
    1. 96528. Cao Y, Hou L, Wang W. Dietary total fat and fatty acids intake, serum fatty acids and risk of breast cancer: A meta-analysis of prospective cohort studies. Int J Cancer. 2016;138(8):1894-904. doi: 10.1002/ijc.29938. PubMed

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Testosterone Undecanoate on your own; if you are taking Oleic Acid for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

From our Q&A

Questions About Oleic Acid or Testosterone Undecanoate

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Oleic Acid or Testosterone Undecanoate, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Testosterone Undecanoate

This page covers Oleic Acid only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Testosterone Undecanoate page lists 200 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (major), Grapefruit (major), Siberian Cocklebur (major) and St. John's Wort (major).

By severity: 7 major · 150 moderate · 43 minor.

From our pharmacist’s overview on the Testosterone Undecanoate page

“The supplement list for testosterone undecanoate (Jatenzo, Aveed, Kyzatrex, Andriol) deserves real attention before you combine it with much of anything, and the seven major-rated entries are where I would start. Most of the 200 ingredients on file, 121 of them, can change how the body handles this hormone through the CYP3A4 enzyme; gr…”

Reviewed by 2 · Jul 18, 2026

Open the Testosterone Undecanoate interaction page

One more smart check

Taking Oleic Acid as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1,803 real supplement products containing Oleic Acid, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Oleic Acid. Even though Oleic Acid itself has no known interaction with Testosterone Undecanoate, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Oleic Acid and Testosterone Undecanoate Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Oleic Acid
Top 25%

#210 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Testosterone Undecanoate
Top half

#1,372 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Oleic Acid reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Oleic Acid and Testosterone Undecanoate records this page draws on were last updated June 22, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Oleic Acid

What is Oleic Acid?

  • Heart health
  • Healthy cooking fat
  • Skin moisturizing
  • Part of the Mediterranean diet
  • Anti-inflammatory support

Oleic acid is a heart-healthy monounsaturated fat found mainly in olive oil, canola oil, avocados, and nuts. As part of a Mediterranean-style diet, it is widely viewed as a healthier replacement for saturated fats, but it is still a calorie-dense fat, so amounts matter. Talk to your pharmacist or doctor before using concentrated supplements.

Fatty acid found in plant oils and animal fats · Olive oil, capsules, softgels, cooking oils, skin products

An interaction check asks whether these two react with each other — it does not ask whether Oleic Acid is a good idea for someone in your situation. Here is what our Oleic Acid record says about it on its own.

Oleic Acid: dosing

There is no official standardized dose of oleic acid as a supplement. Most people get healthy amounts simply by using olive oil and eating foods like nuts and avocados in place of less healthy fats.If you use an oleic acid product or olive oil supplement, follow the directions on the product label. Because it is a fat with calories, keep portion sizes reasonable.

From our Oleic Acid monograph — the full record covers uses, side effects and every documented interaction.

Read the full Oleic Acid monograph & all interactions
Medication

About Testosterone Injection

What Is Testosterone Injection Used For?

Brand names: Andriol, Aveed, Jatenzo, Kyzatrex

Testosterone injection is primarily used in men whose bodies do not produce enough testosterone on their own — a condition called hypogonadism. This includes primary hypogonadism (a problem with the testicles themselves, such as from injury, infection, or surgery) and hypogonadotropic hypogonadism (caused by problems in the brain's hormone signaling from the hypothalamus or pituitary gland). It is also used to stimulate puberty in carefully selected adolescent males with clearly delayed puberty who have not responded to other support.

Testosterone Enanthate Injection is also approved for use in women with advanced, inoperable metastatic breast cancer (specifically skeletal metastases) who are one to five years past menopause, or in premenopausal women with hormone-responsive breast cancer who have had their ovaries removed. This use should be directed by an oncologist. Aveed (testosterone undecanoate) is specifically approved for male hypogonadism only.

See full Testosterone Injection drug information
Keep checking

Other Drugs & Oleic Acid

Browse every other medication we’ve checked against Oleic Acid — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
86Moderate
0Minor
2,743No known interaction
86 Moderate 2,743 No interaction
Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the Oleic Acid page.

No interaction 2,743 drugs checked — show the list

We also checked Oleic Acid against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,743 medications checked with no known interaction — see the full Oleic Acid list.

See the full Oleic Acid interactions page
See every supplement checked against Testosterone Undecanoate, ranked by severity
Evidence & sources

Oleic Acid References

The 19 references that drive our Oleic Acid monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Madigan C, Ryan M, Owens D, et al. Dietary unsaturated fatty acids in type 2 diabetes: higher levels of postprandial lipoprotein on a linoleic acid-rich sunflower oil diet compared with an oleic acid-rich olive oil diet. Diabetes Care 2000;23:1472-7. PubMed
  2. Gillingham, L. G., Gustafson, J. A., Han, S. Y., Jassal, D. S., and Jones, P. J. High-oleic rapeseed (canola) and flaxseed oils modulate serum lipids and inflammatory biomarkers in hypercholesterolaemic subjects. Br J Nutr 2011;105(3):417-427. PubMed
  3. Jones PJ, Senanayake VK, Pu S, Jenkins DJ, Connelly PW, Lamarche B, Couture P, Charest A, Baril-Gravel L, West SG, Liu X, Fleming JA, McCrea CE, Kris-Etherton PM. DHA-enriched high-oleic acid canola oil improves lipid profile and lowers predicted cardiova
  4. Cater, N. B., Heller, H. J., and Denke, M. A. Comparison of the effects of medium-chain triacylglycerols, palm oil, and high oleic acid sunflower oil on plasma triacylglycerol fatty acids and lipid and lipoprotein concentrations in humans. Am.J Clin.Nutr PubMed
  5. Mozaffarian D, Clarke R. Quantitative effects on cardiovascular risk factors and coronary heart disease risk of replacing partially hydrogenated vegetable oils with other fats and oils. Eur J Clin Nutr. 2009;63(Suppl 2):S22-33. PubMed
  6. Cao Y, Hou L, Wang W. Dietary total fat and fatty acids intake, serum fatty acids and risk of breast cancer: A meta-analysis of prospective cohort studies. Int J Cancer. 2016;138(8):1894-904. doi: 10.1002/ijc.29938. PubMed
  7. FDA completes review of qualified health claim petition for oleic acid and the risk of coronary heart disease. November 2018. Available at: www.fda.gov/Food/NewsEvents/ConstituentUpdates/ucm624758.htm. Accessed January 25, 2019.
  8. Liu X, Kris-Etherton PM, West SG, et al. Effects of canola and high-oleic-acid canola oils on abdominal fat mass in individuals with central obesity. Obesity. 2016;24(11):2261-2268. PubMed
  9. Bowen KJ, Kris-Etherton PM, West SG, et al. Diets enriched with conventional or high-oleic acid canola oils lower atherogenic lipids and lipoproteins compared to a diet with a western fatty acid profile in adults with central adiposity. J Nutr. 2019;149(3 PubMed
  10. Steffen BT, Duprez D, Szklo M, Guan W, Tsai MY. Circulating oleic acid levels are related to greater risks of cardiovascular events and all-cause mortality: The Multi-Ethnic Study of Atherosclerosis. J Clin Lipidol. 2018;12(6):1404-1412. PubMed
  11. Banim PJ, Luben R, Khaw KT, Hart AR. Dietary oleic acid is inversely associated with pancreatic cancer - Data from food diaries in a cohort study. Pancreatology. 2018;18(6):655-660. PubMed
  12. Morin SJ, Gaziano JM, Djoussé L. Relation between plasma phospholipid oleic acid and risk of heart failure. Eur J Nutr. 2018;57(8):2937-2942. PubMed
  13. Samieri C, Féart C, Proust-Lima C, et al. Olive oil consumption, plasma oleic acid, and stroke incidence: the Three-City Study. Neurology. 2011;77(5):418-25. PubMed
  14. Compher CW, Kinosian BP, Rubesin SE, Ratcliffe SJ, Metz DC. Energy absorption is reduced with oleic acid supplements in human short bowel syndrome. JPEN J Parenter Enteral Nutr. 2009;33(1):102-8. PubMed
  15. Ben Fradj MK, Ouanes Y, Hadj-Taieb S, et al. Decreased oleic acid and marine n?-?3 polyunsaturated fatty acids in Tunisian patients with urothelial bladder cancer. Nutr Cancer. 2018;70(7):1043-1050.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Oleic Acid and Testosterone Undecanoate Together: Common Questions

Is it safe to take Oleic Acid with Testosterone Undecanoate?
We do not list a known interaction between Oleic Acid and Testosterone Undecanoate. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Are Oleic Acid and Testosterone Undecanoate used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Oleic Acid in each. That is a conversation for your prescriber, especially if Testosterone Undecanoate is being adjusted to a target.
How was the Oleic Acid and Testosterone Undecanoate combination checked?
Interactions in our licensed database are recorded against drug classes. Testosterone Undecanoate is filed under 6 classifications, and Oleic Acid has documented interactions with 1 drug class — none of Testosterone Undecanoate's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Oleic Acid interact with any other medications?
Yes. Oleic Acid has 86 documented drug interactions in our database — Testosterone Undecanoate is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Testosterone Undecanoate interact with any supplements?
Yes. Testosterone Undecanoate has documented interactions with 200 supplements in our database — Oleic Acid is not one of them. The Testosterone Undecanoate interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Oleic Acid monograph Uses, safety profile, and every drug interaction in one place Testosterone Injection drug information The full plain-English guide to this medication Testosterone Undecanoate supplement interactions Every supplement checked against Testosterone Undecanoate, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 19 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Testosterone Undecanoate and Oleic Acid?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.