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Nattokinase 10,000 FUA fermented botanical formula for vascular support.
Supports healthy blood flow throughout the body
Helps vessels stay flexible and responsive
Helps protect blood vessels from oxidative stress
Nattokinase works differently than prescription drugs — it supports your body's natural fibrin balance rather than blocking an enzyme. Because it may influence normal clotting function, consult your doctor before adding it to your regimen, especially if you are taking an anticoagulant such as warfarin or Eliquis.
With enzymes, weight doesn’t tell you much — activity does. Nattokinase is measured in Fibrinolytic Units (FU), and we disclose the full daily serving’s activity plainly: 10,000 FU across 3 capsules.
Nattokinase comes from natto, a fermented soybean food eaten daily in Japan for over 1,000 years, and it is well tolerated in clinical studies. Every batch of Plain Harvest is third-party tested. As with any supplement, consult your healthcare provider if you have existing health conditions or take medication.
Nattokinase is not a painkiller and nothing happens in an hour. It works on accumulation. Most people are looking at week three or four before they pay attention to their readings, and the research runs over months. Give it the full guarantee window before you decide.
Our team is available around the clock to answer any questions about your product. If you are not fully satisfied, we offer a hassle-free 100% money-back guarantee within the first 90 days.
Dosage: 3 capsules daily (10,000 FU) — 80 servings per bottle
Timing: On an empty stomach — 30 minutes before a meal, or at bedtime
Consistency: Same time each day
Support it: Heart-healthy diet, regular movement, plenty of water
Nattokinase works with your body, not as a replacement for healthy habits.
1,000-Year-Old Japanese Tradition, Concentrated Into one Formula
For over 1,000 years, families across Japan have started their mornings the same way: a bowl of natto — sticky, fermented soybeans.
In 1980, Dr. Hiroyuki Sumi discovered why this breakfast deserved attention. Hidden inside natto was an enzyme: nattokinase. It has since appeared in 1,000+ published studies on circulatory health — one tracking people for 16 years.
Nattokinase — 10,000 FU
Healthy Fibrin Breakdown + Circulation
The engine of the protocol. High-potency nattokinase supports healthy fibrin breakdown and smooth, healthy circulation — delivering 10,000 FU per daily serving.
CoQ10
Heart Energy
Aged Garlic
Blood Pressure Support
Turmeric
Inflammatory Balance
Grape Seed
Vessel Strength
Pine Bark
Arterial Flexibility
Bromelain
Enzyme Support
Dandelion Root
Fluid Balance
Feel Lighter. Move Easier.
Stay Active Longer.
50,434+ HAPPY CUSTOMERS
89%
reported feeling more energetic during the day after 8 weeks†
84%
said their circulation felt noticeably improved†
91%
said they plan to keep taking Nattokinase 10,000 FU
"I struggled with high cholesterol for 8 years. After starting Plain Harvest's Natto complex my LDL 'bad' cholesterol dropped significantly. It physically cleared the fatty buildup that lead to weight drop and increase in energy."
Linda W., 51
VERIFIED PURCHASE
"My latest scans showed a physical reduction in arterial buildup after 6 months. My doctor was stunned since nothing else could erode existing deposits like this."
Dustin P., 66
VERIFIED PURCHASE
"My blood pressure finally hit the 118/78 mark and the heart isn't pumping like crazy anymore."
Chloe M., 58
VERIFIED PURCHASE
"I was on the brink of a heart attack due to chronic fibrin buildup. Within just three weeks of this protocol, the heavy, tight feeling in my chest eased out. I can finally move freely again without the constant fear."
Wallace M., 76
VERIFIED PURCHASE
Your Nattokinase Journey
Week 1
Your body begins improving normal fibrin turnover, helping blood move more efficiently through your vascular system. The first changes are subtle — steadier afternoon energy, less of that sluggish feeling after sitting, and a lighter feeling through the day.†
As blood flow becomes more consistent, oxygen and nutrients reach your muscles and tissues more efficiently. Everyday movement starts to feel easier — less heaviness after long days, more comfortable hands and feet, and fewer moments where your body feels like it’s dragging.†
Month 1
Month 2–3
With circulation working more smoothly and your vessels responding more effectively, those early changes begin showing up in what you can do. Walks feel easier. Stairs take less out of you. Your energy carries further into the day.†
Healthy circulation starts feeling less like something you’re working on and more like your normal. You move with greater ease, stay active longer, and finish busy days feeling like your body can keep up with you.†
Month 6+
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THE COMPARISON
Nattokinase 10,000 FU vs. Conventional Heart Stack
Nattokinase 10,000 FU
Nutrient / Feature
Conventional Heart Stack
10,000 FU
Nattokinase Dose
None
Direct enzyme activity
Fibrin Support
Not addressed
Direct
Fibrin Breakdown
No fibrin activity
Enzyme + vessel polyphenols
Blood Flow Optimization
Indirect at best
Enzyme + vessel polyphenols
Circulation Support
Scattered across bottles
Supports healthy range
Blood Pressure Impact
Heart muscle only
One-formula daily arterial routine
Best For
Energy Support & Antioxidants Benefits
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Frequently asked questions
Nattokinase has natural blood-thinning (fibrinolytic) properties, so if you're currently taking anticoagulants, antiplatelet drugs, or blood pressure medications, we strongly recommend consulting your healthcare provider before combining them. Your doctor can help you determine the right approach for your individual needs.
Fibrinolytic Units (FU) measure the enzymatic activity of nattokinase — the actual work it does to support healthy circulation and fibrin balance. A higher, standardized dose like our 10,000 FU delivers meaningfully stronger, clinically-studied cardiovascular support than the lower-potency products commonly found on the market, so you get the level of activity that research points to.
Every body is different, but most customers begin noticing benefits within 4 to 8 weeks of consistent daily use. Because nattokinase works gradually to support healthy circulation, we recommend taking it daily without skipping days to give your body the best chance to respond.
Nattokinase is generally well-tolerated by most people. Some may experience mild, temporary digestive upset when first starting. Our complex is third-party tested for purity and potency to ensure a clean, high-quality product. As with any supplement, if you're pregnant, nursing, taking medication, or have a medical condition, please consult your healthcare provider first.
Absolutely. Our complex delivers a concentrated, standardized dose of nattokinase without the strong taste, smell, and texture of traditional fermented soybeans. Instead of trying to eat natto daily, you get a consistent, measured level of fibrinolytic activity in one simple daily serving.
For best results, take three capsules daily on an empty stomach — ideally first thing in the morning or between meals. Taking it away from food helps support optimal absorption of the nattokinase. Consistency is key, so make it part of your daily routine.
We stand behind every bottle with a 90-day money-back guarantee — no questions asked. If you're not completely satisfied, simply reach out to our team within 90 days of your purchase and we'll make it right.
*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. Results vary from person to person. Consult your healthcare provider before use if you are pregnant, nursing, taking medication — especially anticoagulant or antiplatelet medication — or have a medical condition.