Tribulus does not raise testosterone in human trials, and its libido results are mixed. Horny goat weed has no human trials for sexual function, and it carries heart-rhythm cautions. Some horny goat weed products were found with hidden ED drugs. Jellyfil lists both in an 82 mg blend of nine ingredients, with amounts not published.
Two famous names in men's supplements, with thin human evidence.
Tribulus terrestris is a low, spiny plant found in warm, dry places around the world. It is sold as a "testosterone booster" in many gym supplements.
Horny goat weed is the common name for Epimedium, a leafy plant from China. Its best-known compound is icariin.
Both have long histories as "male" herbs in traditional use. Jellyfil lists both in its 82 mg blend. The label does not give their amounts, extract strength or icariin content.
Popular in testosterone-booster products. Sold as fruit or leaf extract.
Tap to see the research ↻Human trials do not show a testosterone rise (Qureshi et al., 2014). Libido results are mixed.
Tap to flip back ↺Sold for desire and stamina. Contains icariin.
Tap to see the research ↻No human trials for sexual function (MSKCC Epimedium, 2023). Heart cautions apply.
Tap to flip back ↺A review of 11 studies says tribulus alone does not raise it.
No. A 2014 systematic review looked at 11 studies, including human trials in healthy people (Qureshi et al., 2014). Testosterone went up only when tribulus was one part of a combined supplement. On its own, it did not raise testosterone.
The authors wrote that evidence suggests tribulus is "ineffective for increasing testosterone levels in humans." Animal results did not carry over to people.
Tribulus and testosterone: the two main sources
| Source | What it looked at | What it found |
|---|---|---|
| Qureshi et al., 2014 | 11 studies, human and animal | No testosterone rise in humans from tribulus alone |
| OPSS Tribulus, 2024 | Clinical trials in men, safety reports | Mixed results; "no strong evidence supports the marketed claims" |
This matters for Jellyfil. A brand graphic uses the words "healthy testosterone." The label has no testosterone figure, and the best-known testosterone herb in the blend does not raise it in human trials. We will not repeat that claim.
Mixed trials, small effects, varied products.
The honest answer is maybe, a little, in some studies. Clinical trials in men show mixed results (OPSS Tribulus, 2024). Some small trials report better desire scores, while others find no difference from placebo.
Mixed results usually mean one of three things: the effect is small, the products differ a lot, or the trials are too small to tell. With tribulus, all three apply.
Tribulus: strength of evidence by question (editorial reading of the sources)
If low desire is new or bothering you, start with a check-up. Stress, poor sleep, medicines and low testosterone can all play a part. Our men’s sexual health guide explains what a doctor looks for.
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No proven dose, and the blend is small.
There is no proven daily amount, because tribulus has not been shown to raise testosterone in people. Many gym products sell 1,000 mg capsules. Sleep problems, fatigue and a faster heart rate have been reported above 1,000 mg a day.
Jellyfil has a small blend, so its tribulus is far below the amounts linked to side effects. It is also far below the amounts used in trials. The real split of the blend is not published.
See the full panel on the Supplement Facts page.
Popular name, no human trials for sexual function.
We do not know, because it has not been tested in men. Memorial Sloan Kettering states there are no human trials of horny goat weed for sexual dysfunction (MSKCC Epimedium, 2023). Operation Supplement Safety also notes a lack of human research for sexual-health or performance claims (OPSS, Horny goat weed, 2024).
Icariin is the compound most studied in lab and animal work. Lab results are a starting point for research, not proof that a supplement helps people. The amount of icariin in any product also varies a lot, and the label does not state it.
Heart effects come first on the list.
Reported effects include a rapid or irregular heartbeat, chest pain, shortness of breath, dizziness, sweating, mood changes and stomach upset (OPSS, Horny goat weed, 2024). MSKCC advises avoiding it with heart disease and hormone-sensitive cancers (MSKCC Epimedium, 2023).
Who should check before horny goat weed
| If you have or take | Why it matters | Next step |
|---|---|---|
| Heart disease or rhythm problems | Rapid irregular heartbeat reported | Avoid unless your cardiologist approves |
| Hormone-sensitive cancer | Experts advise avoiding it | Talk to your oncologist |
| Drugs processed by CYP3A4 | Possible interaction | Ask your pharmacist |
| Aromatase inhibitors | Possible interaction | Ask your prescriber |
Four checks, one honest conclusion.
A brand graphic says the formula supports "healthy testosterone." Here is how each ingredient that people link to testosterone holds up.
So the graphic goes further than the evidence. Jellyfil is a dietary supplement, not a testosterone treatment. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Read more on ashwagandha and its small hormone study.
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Four steps, and no supplement in the middle.
Only a blood test can tell you. Low testosterone is diagnosed with at least two early-morning blood tests plus symptoms (Endocrine Society, 2022). Tiredness or low desire can also come from blood pressure, diabetes, medicines, thyroid problems or depression (MedlinePlus, 2025).
Low desire, fatigue or low mood that lasts for weeks.
Tell your doctor what you have noticed and what you take.
At least two tests between 7 and 10 AM. Normal adult levels are roughly 300 to 1,000 ng/dL.
If testosterone is truly low, the main treatment is prescription therapy.
Levels fall about 1% a year after age 30. That slow drift is normal and is different from a medical deficiency.
Famous names, thin evidence, small amounts.
These two are the weakest-evidence parts of the formula. If testosterone is your main concern, see a doctor. If you want a gentle daily routine and the cautions above do not apply, compare all nine ingredients on the Jellyfil ingredients page.
Not in human trials. A systematic review concluded that "evidence to date suggests that TT is ineffective for increasing testosterone levels in humans" (Qureshi et al., 2014). Testosterone rose only when tribulus was mixed with other ingredients.
The evidence is weak. Trials in men show mixed results, and Operation Supplement Safety says "no strong evidence supports the marketed claims" (OPSS Tribulus, 2024). Most studies were short, up to about 3 months.
Some small trials report better desire scores and others do not. The results are mixed, so there is no reliable answer yet. A sudden drop in desire is also worth mentioning to a doctor, since it can have medical causes.
There is no proven dose, because tribulus has not been shown to raise testosterone in humans. Sleep problems, fatigue and a faster heart rate have been reported above 1,000 mg a day. Jellyfil's whole nine-ingredient blend is 82 mg.
Our sources do not list high blood pressure as a known effect. They do report a faster heart rate above 1,000 mg a day. If you have heart or blood pressure problems, ask your doctor before using tribulus products.
There are no human trials of horny goat weed for sexual function (MSKCC Epimedium, 2023). Most of what you read online comes from lab and animal work on its compound icariin. That does not show it works in men.
There is no human data to support that. No trial in men has shown a testosterone rise from horny goat weed. Treat any testosterone claim for it as unproven.
Reported effects include a rapid or irregular heartbeat, chest pain, shortness of breath, dizziness, sweating, mood changes and stomach upset (OPSS, Horny goat weed, 2024). People with heart disease should avoid it.
It depends on the product and on you. FDA has found some horny goat weed products with hidden ED drugs such as tadalafil and sildenafil. Buy only from a known seller, and ask your doctor first if you have heart disease or take nitrates.
The amount is not published, and the icariin content is not stated. It is one of nine ingredients that share an 82 mg blend, about 9 mg each on average.
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All nine blend ingredients, the gummy base and how 82 mg compares with research doses.
Read more →Stress-and-sleep herb; small testosterone studies. Rare liver and thyroid cautions.
Read more →What the FDA found, why hidden ED drugs are dangerous, the red flags and how to protect yourself.
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