Nitric Boost Ultra Review: The Nitric Oxide Claim, Examined

What this product is marketed for, stated plainly

The manufacturer's own page markets Nitric Boost Ultra primarily for male sexual performance, alongside energy and circulation. We are saying that up front because a review that described it only as a "circulation supplement" would be misleading you about where the link goes.

That matters for a practical reason as well as an honest one. Difficulty with erections is frequently the first visible sign of cardiovascular disease, diabetes or a medication side effect — the small vessels are affected before the large ones. It is one of the more useful early warnings the body gives, and treating it with a supplement instead of investigating it means missing that warning. If this is new or worsening for you, see a doctor before you buy anything.

How we assessed this product

Desk research. We read the ingredient list and claims published on the manufacturer's official site and looked at what is established about each ingredient. No samples, no laboratory testing, no user survey. We do not publish star ratings on supplements.

The manufacturer lists eight ingredients but does not publish a full Supplement Facts panel with per-ingredient amounts. We cover all eight below, including the one the marketing features least. Dose is decisive for two of the main ingredients, so the missing amounts are a real limitation on what anyone can conclude.

Quick facts

Product type	Powdered supplement, one scoop daily, mixed into liquid
Marketed for	Blood flow, nitric oxide production, energy and stamina, and male sexual performance
Ingredients listed	Eight: beet root powder, L-arginine, L-citrulline DL-malate, niacin (vitamin B3), horny goat weed, ginkgo biloba, dong quai, D-aspartic acid
Doses disclosed?	No. No full Supplement Facts panel published at the time of writing
Supply	One jar is a 30-day supply
Price at time of writing	$69 for one jar, $59 per jar for three ($177), $49 per jar for six ($294). Verify current pricing on the official site
Guarantee	60-day money-back guarantee stated and administered by the seller
Do not take without medical advice if	You take heart medication for chest pain, any prescription treatment for erectile function, blood pressure medication or a blood thinner — see the safety section, this one is serious

The mechanism, and what it actually supports

Nitric oxide is a signalling molecule that relaxes the smooth muscle lining your blood vessels, which widens them and increases blood flow. That is real physiology, not marketing — it is the same pathway that prescription treatments for erectile function act on, from a different angle. The premise of a product like this is to give the body more of the raw material it uses to make nitric oxide.

There are two routes. Dietary nitrate, which is what beet root provides, is converted through nitrite into nitric oxide, and this pathway has reasonably good support: concentrated beetroot juice has been shown in multiple trials to modestly lower blood pressure and improve exercise efficiency. The doses used in those studies are specific, and typically higher than what a general blend provides.

The second route is the amino acid pathway, where L-arginine is converted to nitric oxide directly. L-arginine taken orally is largely broken down in the gut and liver before it reaches circulation, which is why L-citrulline — which the body converts to arginine after absorption — raises blood arginine more effectively than arginine itself. Citrulline at around 6 to 8 grams daily has some supportive evidence for blood flow and exercise performance. Whether this product contains anything near that is not something we could establish, because the amounts are not published.

So the mechanism is sound and the two lead ingredients are the right ones. The open question is entirely about dose, and it is the question the label would answer if it were published. Our guide on how to read a supplement label explains why that matters.

All eight ingredients, one at a time

Beet root powder

A dietary nitrate source, converted in the body to nitric oxide via nitrite.

Evidence note: the best-supported ingredient here. Trials on concentrated beetroot show modest blood pressure reduction and improved exercise economy. Effects are dose-dependent and powder is generally less concentrated than the juice used in studies.

L-citrulline DL-malate

Converted to arginine after absorption, raising nitric oxide substrate more effectively than arginine taken directly.

Evidence note: reasonable support for blood flow and exercise performance at roughly 6–8 g daily. Smaller amounts have not shown the same effects. Amount here is undisclosed.

L-arginine

The direct precursor to nitric oxide, though poorly bioavailable when taken by mouth.

Evidence note: extensively studied with mixed results, largely because of that bioavailability problem. Including it alongside citrulline is common practice but adds less than the citrulline does.

Horny goat weed (epimedium)

A traditional herb whose main active compound, icariin, is the ingredient in this formula most directly aimed at sexual function.

Evidence note: most of the supporting research is in cell and animal studies; well-controlled human trials are scarce, and the amount here is undisclosed. It may lower blood pressure and may affect blood clotting, which adds to the interaction concerns below. Reported side effects include dizziness and a rapid heartbeat at higher intakes.

Ginkgo biloba

A herb traditionally used for circulation and cognitive function.

Evidence note: evidence for circulation benefit is weak and inconsistent. More importantly, ginkgo has antiplatelet effects and is a bleeding-risk concern alongside blood-thinning medication and before surgery.

D-aspartic acid

An amino acid marketed for testosterone support.

Evidence note: early small studies suggested a short-term testosterone rise; better-controlled follow-up trials largely failed to replicate it, and some found no effect or a decrease in trained men. We would not count on this ingredient.

Niacin (vitamin B3)

A B vitamin that causes vasodilation and flushing at higher doses.

Evidence note: niacin's flushing effect is real but is a skin-level response, not evidence of the circulatory benefit implied. High doses over long periods can affect the liver, which is one more reason to want the amount disclosed.

Dong quai

A traditional herb, used historically in women's health rather than men's.

Evidence note: dong quai has anticoagulant properties and interacts with blood-thinning medication; its inclusion in a male vitality formula is not something the evidence explains.

The honest summary of the evidence

Beetroot and citrulline are legitimate ingredients with genuine, if modest, supporting evidence for blood flow — and modest is the operative word. Horny goat weed is the ingredient aimed most directly at the product's marketing, and it is also the one with the thinnest human evidence. Nothing in this formula has been shown to treat erectile dysfunction, and no supplement should be represented as doing so. The most likely realistic outcome is a small improvement in circulation and exercise tolerance, at a dose we cannot verify, in some people. If the marketing you encountered promised more than that, the marketing was ahead of the evidence.

Safety — the interaction that can actually hurt you

Blood pressure and medication for erectile function. Nitric oxide donors lower blood pressure. So does the prescription heart medication used for chest pain, and so do the prescription treatments for erectile function. Combining agents that work on the same pathway can cause a sudden, severe drop in blood pressure — which is why those two classes are an absolute contraindication together in prescribing guidance. A nitric-oxide supplement taken alongside either is not the same risk as combining two prescription medicines, but it acts on the same system and it is not a combination to improvise with. Horny goat weed may add to the blood-pressure-lowering effect. If you take heart medication, anything for erectile function, or blood pressure medication, ask your doctor before starting this.

Bleeding risk. Ginkgo and dong quai both have antiplatelet or anticoagulant properties, and horny goat weed may affect clotting too. Alongside any blood-thinning medication, that is a meaningful concern, and all three should be stopped well before any planned surgery or dental procedure.

Blood pressure generally. The intended effect is vasodilation. If your blood pressure is already low or well controlled on medication, additional lowering can cause dizziness or fainting rather than benefit.

Heart rhythm. If you have a heart rhythm problem or notice palpitations after starting it, stop and speak to a doctor.

Take the ingredient list to your doctor or pharmacist before your first scoop if you take any regular medication, particularly anything for the heart, blood pressure, blood thinning or erectile function.

Who this is for — and who should skip it

Might be worth considering if

You have had the underlying issue medically assessed and nothing treatable was found
You are mainly interested in the exercise and circulation side, where the evidence is stronger
You take no cardiovascular, blood-thinning or erectile-function medication
You are comfortable with a modest, uncertain effect and can afford the multi-jar pricing

Skip it, or speak to a doctor first, if

You take heart medication for chest pain, medication for erectile function, or blood pressure medication
You take any blood thinner, or have surgery scheduled
The symptom is new, worsening, or came with chest pain, breathlessness or fatigue — that needs investigating, not supplementing
You have low blood pressure, a history of fainting, or a heart rhythm problem
You are hoping this replaces a prescription treatment. It does not, and the prescription route is both effective and inexpensive now

Pros and cons

What we liked

The two lead ingredients are the right ones for the stated mechanism
Powder format allows a larger dose than capsules realistically can
60-day money-back guarantee, stated as no-questions-asked
Manufactured in the US in a GMP-certified facility, per the manufacturer

What gave us pause

No Supplement Facts panel published — and dose decides whether this works at all
Horny goat weed rests mostly on animal and lab research, and adds to the blood-pressure and bleeding concerns
D-aspartic acid and dong quai look like formulation padding rather than evidence-led choices
Three ingredients that may affect clotting, without a clear offsetting benefit
The official page's claims about sexual function go well beyond what any supplement evidence supports
Expensive next to buying citrulline malate and beetroot powder separately at studied doses

Price and refunds

At the time of writing the manufacturer prices a single jar at $69, three jars at $59 each ($177) and six jars at $49 each ($294), each jar being a 30-day supply. As usual the pricing is structured to move you toward the larger package.

A 60-day money-back guarantee is stated, described as no-questions-asked. That guarantee is offered and administered by the seller, not by us, and we have no role in refunds. Read the terms on the official site, keep your order confirmation, and start a refund request inside the window rather than at the end of it.

Check current pricing on the official site

Affiliate link. Pricing above was accurate on 18 September 2026 and may have changed.

Sources and further reading

Independent references we used to check the claims on this page. They describe the ingredients and interactions in general, not this specific product.

Frequently asked questions

Does this treat erectile dysfunction?

No, and no dietary supplement should be described as treating it. Erectile dysfunction has identifiable causes — vascular disease, diabetes, hormonal issues, medication side effects, psychological factors — and effective prescription treatments exist. What a nitric oxide supplement might plausibly do is modestly support blood flow. That is a different claim, and a much smaller one.

Can I take it with medication for erectile function?

Ask your doctor first. Both act on the same blood-pressure-lowering pathway and combining them without advice is not something we would suggest. If you take heart medication for chest pain, the answer is no until a clinician says otherwise.

What is horny goat weed, and is it safe?

It is a traditional herb (epimedium) marketed for sexual function. The research behind it is mostly in animals and cell studies, and the amount in this formula is not published. It may lower blood pressure and affect clotting, so it matters most for people on blood pressure medication, blood thinners or erectile-function treatment. Ask a pharmacist before combining it with any of those.

How long before I would notice anything?

Beetroot's blood pressure effect is measurable within hours in studies but is small and requires consistent intake to sustain. Citrulline's effects on exercise performance build over days to weeks. There is no published trial of this finished product, so any timeline for it specifically is an assumption. Set a limit in advance and use the refund window.

Could I just buy the ingredients separately?

Yes, and for the two ingredients with the best evidence you probably could do so at studied doses for considerably less. Citrulline malate and beetroot powder are both widely available as single-ingredient products. That does not make this product bad; it does make the price harder to justify.

Our final take

The science underneath this product is real. Nitric oxide does what the marketing says it does, and beetroot and citrulline are sensible ways to support it. Where we part company with the sales page is the size of the promised effect: the evidence supports modest improvements in blood flow and exercise capacity, not the transformation the marketing describes.

Two things hold us back from a recommendation. The doses are not published, and for citrulline in particular the dose is the whole question. And the formula includes ingredients — horny goat weed, D-aspartic acid, dong quai, ginkgo — that add little on the human evidence and, in three cases, may add bleeding risk.

Most importantly: if you are here because something changed, the right first step is a doctor, not a scoop of powder. Erectile difficulty is often the earliest visible sign of a cardiovascular or metabolic problem, and that is genuinely useful information about your health. Get it checked. If everything comes back clear and you still want to try this, do so knowing the realistic upside is modest. That is the more useful advice, even though it earns us nothing.

Visit the official Nitric Boost site

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Nitric Boost Ultra Review: Examining the Nitric Oxide Claim