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Health information notice. What follows is a review of claims that circulate publicly. It is general information, not medical advice, and it does not take the place of a conversation with a licensed clinician who has access to your records. No part of it should be used as a reason to begin, stop, or adjust a prescribed medication.

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Circulation and Male Vigor: What the Trials Measured, and What They Did Not

A paid page from the makers of Vigor Boost. A firm erection is a blood-vessel event, and the blood vessel is the part of this that has actually been measured in people. Here is what those measurements found, where they came out empty, and the exact line where the research stops and a product claim begins.

Paid advertisement · Published November 10, 2026 · Sources checked against PubMed, November 10, 2026 · Reading time about 9 minutes

What this page is, before anything else

This is a paid advertisement. The makers of Vigor Boost paid for this page. It is not part of this site's Food and Circulation section, it did not go through that section's claim check, and no editorial writer here assessed the product. If you buy through a link on this page, this publication is paid a commission by the seller, at no extra cost to you. Where the money comes from.

Why this page is on a recipe site

Because the research that gets quoted in this corner of the internet is research about food, and this site spends its time on food. The claims readers forward about beets, garlic, greens and hibiscus are the same claims that end up attached to supplements, and the editorial side of this site has been checking them one at a time against the published trials.

So this page does the thing the advertising usually skips. It sets out what the trials measured, in whom, at what dose, and what they found — including the two that were built to find an effect and did not. Then it says plainly what the product is and whose claim it carries. Every study named here is linked to its record in PubMed, the public index run by the United States National Library of Medicine, and the list of them is at the foot of the page.

The part of this that is plumbing

An erection is hydraulic. Blood arrives faster than it leaves, the vessel walls have to relax to let that happen, and the whole event depends on the lining of those vessels doing its job. A systematic review of intervention studies opens by stating the consensus position: the leading cause of erectile dysfunction is arterial dysfunction, and cardiovascular disease is its most common companion (Sex Med, 2018).

That has a consequence worth stating before anything is sold. Pooling 25 studies in 154,794 men, the risk of cardiovascular disease was 43% higher in men with erectile dysfunction than in men without it; coronary heart disease 59% higher, stroke 34% higher, and death from any cause 33% higher, with the association strongest where the dysfunction was severe (J Sex Med, 2019). These were cohort studies, not trials, so they measure association rather than cause.

The one sentence that matters more than anything else on this page

A change in erections is a reason to see a doctor, and the research above is the reason. It is checked in minutes, it is the kind of thing a physician would rather hear early than late, and nothing sold on the internet is a substitute for that appointment. Nothing on this page is a diagnosis, a treatment, or advice to postpone one.

What has actually been measured on the groceries

This is where the advertising usually becomes vague, so here it is with numbers and with the misses.

Beetroot, as a measured daily juice. Sixty-eight adults with high blood pressure drank 250 mL of beetroot juice a day for four weeks against a nitrate-free beetroot juice made to taste the same. Clinic pressure fell 7.7/2.4 mmHg, 24-hour pressure 7.7/5.2 mmHg, and the response of the vessel lining improved by about 20%, with nothing of the sort in the placebo group (Hypertension, 2015). The study was funded by a cardiovascular charity. It measured blood pressure and vessel response, not erections.

Leafy greens, where the claim mostly fails. A single 800 mg nitrate drink made from arugula moved systolic pressure from 122 to 116 mmHg in 18 healthy adults over 150 minutes (J Nutr, 2016). But the two trials built to test eating the vegetables for weeks came out empty: 30 people with mildly raised pressure ate about 200 g a day of nitrate-rich vegetables for four weeks and their pressure did not fall (Am J Clin Nutr, 2018), and 243 adults aged 50 to 70 randomised to leafy greens carrying 300 mg of nitrate a day, to a nitrate tablet, or to neither, for five weeks, came out level: −0.5, −1.2 and −0.6 mmHg (Am J Clin Nutr, 2020). A page selling you something has no business leaving that out.

Garlic, and the gap between a capsule and a clove. Nine double-blind trials in 482 people with hypertension pooled to systolic pressure 9.1 mmHg lower, with the authors themselves calling the evidence not strong (Am J Hypertens, 2015); a review of 17 trials found 3.75 mmHg overall and nothing at all in people whose pressure was normal (J Clin Hypertens, 2015). Those used standardised capsules. The one trial that tested the clove — 192 adults, one medium clove a day, six days a week, six months — found no effect on cholesterol at all (Arch Intern Med, 2007). And on garlic and erectile function in people, we could find no trial in either direction.

Hibiscus, which works on pressure and loses to a drug. Sixty-five adults with raised pressure drinking three servings a day for six weeks came out 7.2 mmHg lower against 1.3 on placebo (J Nutr, 2010), and 13 trials in 1,205 people pool to 6.67/4.35 mmHg (J Cardiovasc Pharmacol, 2022). In the one double-blind trial that put it against lisinopril directly, hibiscus lowered pressure and lowered it less than the drug (Planta Med, 2007). It also interacts with medication, and the interactions are in the list near the foot of this page.

The editorial side of this site goes through these claims one by one, with every identifier, in its claims review. That page was written without reference to any product, and it reaches the same verdicts as the paragraphs above, which is the only reason the paragraphs above are worth reading on a page that is selling something.

The one place somebody measured the outcome itself

Everything above measures a pressure reading or an artery. Three pieces of research went after erectile function directly, and they are about diets and habits rather than about any single food.

Sixty-five men with metabolic syndrome and erectile dysfunction were followed for two years, 35 on a Mediterranean-style diet and 30 on a control diet. The men on the Mediterranean diet ate more fruit, vegetables, nuts, whole grain and olive oil; their endothelial function score and their C-reactive protein improved while the control group's stayed flat; and thirteen of the 35 reported a score of 22 or higher on the standard erectile-function questionnaire, which is the conventional line for no dysfunction, against two of the 30 (P=0.015) (Int J Impot Res, 2006). The design matters: the men were identified inside an existing database of lifestyle trials rather than randomised afresh for this question.

A 2025 systematic review pooled 14 studies in 27,389 participants and found lower odds of erectile dysfunction with diets rich in produce and nuts — odds ratio 0.54 for nuts, and 0.97 for diets abundant in fruit and vegetables — and the largest effect where diet and exercise were combined, odds ratio 0.49 (Asian J Androl, 2025). Most of what it pools is observational, which means it describes who had fewer problems, not what caused that.

And exercise has the clearest instruction of anything on this page. A systematic review of ten intervention studies in men whose erectile dysfunction came with inactivity, obesity, hypertension, metabolic syndrome or established cardiovascular disease concluded that supervised aerobic training of about 40 minutes per workout, at moderate to vigorous intensity, is the level that improves erectile function (Sex Med, 2018). It is free, and no supplement has that weight of evidence behind it.

Where the research stops and Vigor Boost begins

Here is the honest shape of it. The trials above are about beetroot juice, leafy greens, garlic preparations, hibiscus, dietary patterns and exercise. Doing all of that every day, at the amounts the trials used, is more than most people keep up for a month, and that is the gap the makers of Vigor Boost say their product exists to fill.

According to the maker, Vigor Boost is a daily supplement formulated to support healthy circulation and normal blood flow in adult men. That is the maker's own description of the product, offered as the maker's claim and not as a finding of any study named here.

The studies on this page were done on foods, on diets and on exercise. None of them was a study of Vigor Boost. The product has not been tested in those trials, no result above belongs to it, and nothing here says or implies that it treats, prevents, cures or improves erectile dysfunction, high blood pressure or any other condition. Read the label and the full ingredient list on the maker's own site, check them against anything else you take, and take the question to a pharmacist if you are not sure.

See Vigor Boost on the maker's own site

Who should ask a doctor or a pharmacist first

Short list, and the first item is the important one.

Vigor Boost is intended for adults aged 18 and over. It is not for women, not for anyone under 18, and not a replacement for anything a clinician has prescribed.

Regulatory statement

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.

Sources

Every record below was opened and confirmed on November 10, 2026. Titles are copied from the index, not paraphrased.

Disclosures

Paid advertisement for Vigor Boost. The makers of Vigor Boost paid for this page. Purchases happen on the maker's own site, under the maker's terms, billing, refund policy and privacy policy, not those of this publication — read them before ordering. If you buy after following a link from this page, this publication is paid a commission by the seller, at no extra cost to you.

Not editorial, and not claim-checked. This page is advertising. It did not go through the check that the Food and Circulation section applies to its own pages, no editorial assessment of the product was made, and nothing here should be read as this publication's assessment of Vigor Boost.

Not medical advice. Everything here is general information. It is not medical advice, it creates no professional relationship, and it does not replace a conversation with a physician or another qualified provider who knows your situation. Bring questions about a condition or a medication to them, and never postpone or ignore their advice because of something read on this site.

Regulatory statement. Claims about dietary supplements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure or prevent any disease.

Individual results. Experiences differ for reasons this publication has no way to assess. No particular outcome is promised, suggested or typical. A personal account published anywhere is that one person's account and predicts nothing for anyone else.

How the studies here are reported. Each one is named with what it measured, in whom, and at what dose; the identifier links to the public record; where a trial found nothing, that is written down. Results are not pooled here and a relative change is not converted into an absolute one.

Accuracy and updates. Health information moves. The date of the last source check is printed under the headline. If something here looks wrong to you, write to the address below and it will be looked at.