Science Library
Olive Oil and Testosterone: The Butter-Swap Study, Explained
The single controlled trial behind the online claim that olive oil boosts testosterone, broken down with exact fat-swap protocols, measured hormone markers, and honest study limits.
Last updated August 10, 2026
Quick Answer
What the research actually found.
There is one real controlled trial behind the claim that olive oil boosts testosterone, and it is worth reading in full instead of trusting a one-line internet summary. Sixty healthy Moroccan men, ages 23 to 40, ate butter for two weeks, then were split into two groups—one switched to virgin olive oil and one to argan oil—for three more weeks. The olive-oil group saw testosterone rise about 17% and luteinizing hormone (the pituitary signal that drives testosterone production) rise about 43%. That is a real, measurable result from one trial, in one specific population, over three weeks. It has not been replicated at scale. The honest takeaway: swapping saturated fat for olive oil is a low-risk, well-established move for cardiovascular and longevity reasons regardless of the testosterone angle, and this trial adds a plausible bonus reason to make that swap rather than a guarantee.
What did the olive oil vs. butter study actually measure?
Readers searching PubMed for an olive oil testosterone study are usually trying to verify whether the viral numbers come from a legitimate paper. The primary source is Derouiche et al. (2013), published in Natural Product Communications (PMID 23472458).
The researchers evaluated 60 healthy young adult men across a controlled dietary intervention. After a 2-week baseline phase where all subjects consumed butter as their main added lipid, subjects were randomized to consume either virgin olive oil or argan oil for 3 weeks. Blood draws recorded a 17.4% increase in serum testosterone and a 42.6% surge in luteinizing hormone (LH) in the olive oil arm.
Evidence Grade: C (Single RCT, Short Duration)
“The 2013 Derouiche trial demonstrated that replacing butter with extra virgin olive oil for 21 days increased circulating testosterone by 17.4% and luteinizing hormone by 42.6% in healthy young men.”
How much olive oil, and instead of what?
The study participants consumed approximately 25 grams per day of virgin olive oil (roughly 2 tablespoons). Crucially, this was a dietary swap: subjects replaced butter with olive oil, rather than simply adding extra oil to an already calorie-dense diet.
| Swap | Amount studied | Duration | Reported change | Grade |
|---|---|---|---|---|
| Butter → virgin olive oil | ~25g/day (study amount) | 3 weeks | T +17.4%, LH +42.6% | C |
| Butter → argan oil (comparison arm) | ~25g/day | 3 weeks | Smaller/different hormonal profile than olive oil arm | C |
Key takeaway
“The studied protocol replaced approximately 25 grams per day of butter with virgin olive oil, meaning the hormonal changes occurred from swapping dietary fat sources rather than adding extra calories to an existing diet.”
Does olive oil raise testosterone more than other healthy fats?
The trial compared virgin olive oil to butter (a saturated fat source), not to other monounsaturated-fat options like avocado oil, macadamia nuts, or high-oleic sunflower oil. Therefore, current data shows that swapping saturated fat for monounsaturated fat improves the hormonal profile, but it does not prove olive oil is uniquely superior to all other MUFA sources.
Honest limits
“Because the primary trial compared olive oil to butter rather than to other monounsaturated fats, current evidence shows that swapping saturated fat for monounsaturated fat supports testosterone, but does not prove olive oil is superior to other healthy MUFA sources.”
Is this reason enough to add olive oil to my diet?
Yes, but for established cardiovascular and longevity reasons first. Extra virgin olive oil is rich in oleic acid and anti-inflammatory polyphenols. The 17% testosterone increase observed in this 3-week study is a legitimate, welcome bonus, but should be treated as a supportive lever alongside sleep, heavy compound lifting, and calorie management.
Practical framing
“Extra virgin olive oil earns its place in a high-performance diet through established cardiovascular and metabolic benefits, while its potential androgen-supportive effect serves as a plausible secondary advantage.”
Broader Context
How this fits your overall nutrition and longevity strategy
Optimizing endocrine health requires looking at total diet structure, sleep architecture, and training stimulus. Explore our evidence-graded guides to see how fat swaps fit into a complete physique and longevity protocol:
FAQ
Frequently asked questions about olive oil and testosterone
Is the olive oil and testosterone study real?
Yes, it is a real published randomized controlled trial conducted in 60 healthy men in 2013 (Derouiche et al., PMID 23472458). It is not an internet myth, though because it is a single 3-week study, the exact percentage changes should be viewed as promising rather than settled science.
How much olive oil do I need for any effect?
The study used approximately 25 grams per day (roughly 2 tablespoons), replacing butter and saturated fat rather than adding extra olive oil on top of an already high-fat diet.
Should I take olive oil as a supplement instead of cooking with it?
The study used dietary virgin olive oil, not a concentrated capsule or supplement. Cooking with extra virgin olive oil or using it as a salad dressing is the studied approach.
Does this mean butter is bad for testosterone?
The trial measured a comparative outcome (swapping butter for olive oil), not that butter itself damages testosterone in isolation. The honest framing is that virgin olive oil looks like the better fat swap for overall endocrine and cardiovascular profile.
Is olive oil worth prioritizing over other nutrition changes?
For cardiovascular health and longevity, yes—those benefits are well established. For testosterone specifically, swapping saturated fat for virgin olive oil is a helpful, low-risk bonus, but total calorie balance, sleep, and progressive lifting remain the primary levers.
FAQ
Quick questions
Is the olive oil and testosterone study real?
Yes, it is a real published randomized controlled trial conducted in 60 healthy men in 2013 (Derouiche et al., PMID 23472458). It is not an internet myth, though because it is a single 3-week study, the exact percentage changes should be viewed as promising rather than settled science.
How much olive oil do I need for any effect?
The study used approximately 25 grams per day (roughly 2 tablespoons), replacing butter and saturated fat rather than adding extra olive oil on top of an already high-fat diet.
Should I take olive oil as a supplement instead of cooking with it?
The study used dietary virgin olive oil, not a concentrated capsule or supplement. Cooking with extra virgin olive oil or using it as a salad dressing is the studied approach.
Does this mean butter is bad for testosterone?
The trial measured a comparative outcome (swapping butter for olive oil), not that butter itself damages testosterone in isolation. The honest framing is that virgin olive oil looks like the better fat swap for overall endocrine and cardiovascular profile.
Is olive oil worth prioritizing over other nutrition changes?
For cardiovascular health and longevity, yes—those benefits are well established. For testosterone specifically, swapping saturated fat for virgin olive oil is a helpful, low-risk bonus, but total calorie balance, sleep, and progressive lifting remain the primary levers.
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