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Why Men Who Rely On Viagra, Honey Packs And Testosterone Boosters Are Starting To Ask About Nattokinase

The quick fix may help tonight. The desire may still be there. But once men understand the blood-flow side, one Japanese enzyme suddenly becomes a very different conversation.

By Dr. John Woods, Urologist, October 2026
Reading Time: 6 min read

For years I have heard versions of the same conversation from men. One is using Viagra or tadalafil, another keeps a honey packet nearby, and another has already gone through testosterone boosters, tongkat ali, shilajit or whatever “male vitality” formula showed up in his feed. Different products, different mechanisms — but usually the same reason for buying them: the physical response is not as automatic as it used to be.

The part that interests me is what happens next. The desire can still be there, the quick fix can still help, and a testosterone formula can still make someone feel more energetic — yet none of those things automatically answer the blood-flow question underneath the response. That is where nattokinase starts making sense as a completely different conversation.

Not because nattokinase is “natural Viagra.” It is not. The reason it comes up is much simpler: once a man stops asking only “what can help tonight?” and starts asking “what am I doing every day for circulation and cardiovascular support?”, the category changes completely.

→ See the nattokinase formula discussed in this article

The First Thing Men Miss: Desire, Response And Blood Flow Are Not The Same Job

Sildenafil and similar drugs act on the erectile-response pathway during sexual stimulation. Testosterone matters too, especially when it is genuinely low, because hormones can influence libido, energy and sexual function. But the physical response still depends on arterial blood entering erectile tissue quickly enough and in sufficient volume.

That is why a man can honestly say, “The pill works,” and still have a second question sitting underneath it. The real curiosity is not whether something can improve tonight — it is why the baseline response became less reliable than it was ten or fifteen years ago. When desire is still there but the body now needs more help, blood delivery deserves its own place in the conversation.

Those questions overlap, but they are not interchangeable. Once I started looking at the circulation side separately, I stopped treating every male-performance conversation like it was automatically a testosterone conversation.

Then You See How Small The Arteries Are — And The Story Changes

Penile arteries are commonly described as roughly 1–2 millimeters in diameter, while coronary arteries are roughly 3–4 millimeters. That size difference is one reason cardiovascular literature discusses the “artery-size hypothesis”: a smaller vessel has less room to lose before reduced flow becomes noticeable.

That does not mean every performance problem is caused by plaque, and it does not mean a changing erection diagnoses heart disease. Hormones, medications, nerves, sleep, diabetes, surgery and psychological factors can all matter. But it does explain why the vascular side deserves to be part of the conversation instead of being ignored.

Modern sexual-medicine guidance takes that overlap seriously. The Princeton IV consensus describes vasculogenic erectile dysfunction as a cardiovascular risk marker and risk-enhancing factor. That was the point where I stopped looking only at products made for the bedroom and started looking at the cardiovascular literature underneath the response.

This Is Why Nattokinase Starts Coming Up

Nattokinase is an enzyme originally identified from natto, the traditional Japanese fermented soybean food. It is not testosterone, it is not a PDE5 drug, and it is not a stimulant. That is exactly why I think men find it interesting once the conversation moves away from short-term performance and toward circulation.

The research around nattokinase is centered on fibrinolytic activity and cardiovascular markers. So instead of asking what can be taken right before sex, the question becomes what is being done every day for the vascular system underneath the response. That is the bridge from Viagra, honey packs and testosterone boosters to nattokinase.

Japanese natto — the fermented soybean food from which nattokinase was identified.

That was the first shift. The second happened when I actually started comparing nattokinase bottles.

→ See the 10,000 FU nattokinase formula I’m talking about

Then Comes The Part Most Men Never Check: How Much Nattokinase Activity Is Actually In The Bottle?

One bottle says 100 mg. Another says 200 mg. Another says “high potency.” But nattokinase is an enzyme, and the number I want to know is the activity: FU, or fibrinolytic units.

That matters because the human studies have used very different activity levels. A 26-week randomized study used 6,000 FU per day. A much larger 12-month retrospective study involving 1,062 adults primarily used about 10,800 FU per day, while a lower-dose 3,600-FU comparison group did not show the same pattern.

Many commercial formulas sit around 2,000–4,000 FU. Cleanora provides 10,000 FU per 2-capsule daily serving.

There is also a useful counterpoint. A separate three-year randomized placebo-controlled study using 2,000 FU per day did not show a significant effect on progression of subclinical atherosclerosis. Different studies used different designs and activity levels, which is exactly why I do not treat every bottle with “nattokinase” on the label as equivalent.

→ See the exact 10,000 FU formula

10,000 FU Got My Attention. The Enzyme Identity Is What Made Me Look Closer.

Once I understood the activity number, I wanted to know what was actually providing that activity. “Nattokinase” by itself tells me less than the combination of activity, source and enzyme identity. That is where Cleanora started looking different from the generic bottles I had been comparing.

Cleanora uses Japanese NSK-SD® nattokinase, identified as Subtilisin NAT, with 10,000 FU per 2-capsule daily serving. The product states the enzyme identity, uses delayed-release vegetarian capsules, is K2 (MK-7) free, and is third-party tested.

That still would not have been enough for me if the formula stopped there. Cardiovascular health is not a one-ingredient system, so I wanted to see what else had been built around the nattokinase.

That Is Where Cleanora Stops Looking Like Another “Male Performance” Bottle

10,000 FU of Japanese NSK-SD® nattokinase with six supporting ingredients for broader cardiovascular support.

Cleanora also includes aged garlic, CoQ10, turmeric, grape seed, pine bark and bromelain. None of those ingredients is there to make the bottle look like another black-label testosterone booster. The formula is built around broader cardiovascular, antioxidant and circulation support, with 10,000 FU of Japanese NSK-SD® nattokinase as the foundation.

• 10,000 FU per 2-capsule daily serving
• Japanese NSK-SD® / Subtilisin NAT
• Aged garlic + CoQ10 for broader cardiovascular support
• Turmeric + grape seed + pine bark for antioxidant and vascular support
• Bromelain as an additional enzyme in the formula

→ See the full formula and current availability

So Why Are Men Looking At Nattokinase After Trying Everything Else?

Because nattokinase is answering a different question. Viagra is used for the erectile-response pathway, testosterone products are usually sold around hormones and libido, and honey packets are marketed around short-term male performance. Nattokinase sits in the circulation and cardiovascular-support conversation instead.

That does not make those other categories meaningless, and it does not make nattokinase a replacement for prescribed treatment. It simply means a man can get value from one pathway and still decide he wants to support another. Once the vascular side becomes the focus, the supplement shelf suddenly looks very different.

That is the role Cleanora is built around: not another “male enhancement” promise, but a daily cardiovascular and circulation-support formula centered on 10,000 FU of identity-verified Japanese NSK-SD® nattokinase. If that is the part of the system you have not been thinking about, this is the formula I would compare against the bottle already sitting in your cabinet.

→ See why men are looking at Cleanora NSK-SD® Nattokinase 10,000 FU