How does Jelly Force work?

Nitric oxide is a gas the body makes on demand inside the lining of a blood vessel. It tells the smooth muscle in the vessel wall to relax, the vessel widens, and more blood passes through at lower pressure. The whole of the prescription erectile-dysfunction category works on this system, from the far end: those drugs block the enzyme that breaks down the downstream messenger, so whatever nitric oxide is present does more.

L-arginine is the substrate at the near end. It is the amino acid the enzyme nitric oxide synthase converts into nitric oxide, which is why it is on this bottle and on most bottles in this category.

The evidence is real and it is about grams. The dose-response meta-analysis of 22 randomised trials found systolic pressure fell 6.40 mmHg and diastolic 2.64 mmHg on average, in people with and without raised blood pressure, and reported no further benefit above 9 g a day. A 2026 reassessment using 24-hour ambulatory monitoring in five trials and 202 participants found 24-hour systolic pressure down 4.23 mmHg.

For the thing this product is actually sold for, the network meta-analysis is the reference: across 15 randomised trials in 1,000 men, arginine on its own ranked fifth of the treatments compared, below both prescription drugs; arginine alongside tadalafil ranked second, above either drug alone.

The panel adds a second name to this route that the advertising leaves out. In laboratory work, icariin from horny goat weed inhibited PDE5 — the enzyme the prescription drugs block — about eighty times more weakly than sildenafil. Tribulus extract, tested in the same study, did nothing to the enzyme.

Muira puama, catuaba, maca and tribulus all arrive from folk use. That is a reason to investigate a plant, and for two of the four it has led somewhere.

Maca crossed over. A 12-week randomised trial in men aged 21 to 56 found self-rated sexual desire improved from week eight at 1,500 mg and 3,000 mg a day, with serum testosterone and oestradiol unchanged. The authors' own conclusion was that the effect was independent of mood scores and of hormones, which is an unusual and useful thing for a trial to be able to say.

Tribulus crossed over too, and lost its testosterone story on the way. A 2026 meta-analysis of eight trials in men with erectile dysfunction found the IIEF-5 score about 3.2 points above placebo with no change in testosterone, and a 2016 review had already concluded the androgen explanation did not hold. The largest trial used 1,500 mg of extract a day.

Catuaba has laboratory work. Its bark extract inhibits monoamine oxidase A and acetylcholinesterase in vitro, at around 121 micrograms per millilitre, and the 2024 review of Brazilian plants places it among the fourteen with animal-model support behind the tradition.

Muira puama has chemistry. The bark's alkaloid profile is published, and no randomised human trial of the plant alone is. A review covering it alongside fourteen other herbal sexual enhancers concluded that most are safe at therapeutic amounts and that interactions with prescribed drugs are the more serious concern.

No trial of these nine ingredients together, at these amounts, in this format, exists. That is ordinary for the category rather than unusual, and it is the single most important thing to hold in mind when reading a list of studies about individual ingredients.

It also means the honest question is not whether the ingredients work. It is whether an 82 mg blend of them, once a day, does anything a person would notice. Nobody has measured that, here or anywhere.

What has been measured, and is worth more than this bottle or any other in the category, is the boring list. The 2026 review of erectile dysfunction and cardiovascular health sets out how tightly the two run together through endothelial function and inflammation. Blood pressure, weight, sleep, alcohol and movement all act on the same machinery, they all have randomised evidence, and none of them is sold here.