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Japanese Nattokinase - 4,000 FU Odorless Softgels

Supports Healthy Blood Flow & Circulation
Promotes Cardiovascular Wellness Naturally
Maximum Strength 4,000 FU Japanese Formula
Enteric Coated for Superior Absorption
Regular price $45.00
Regular price $45.00 Sale price $90.00
SAVE 50% Sold out
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Trusted by 10K+ customers who choose Kyoséi for consistent, long-term wellness support.

Backed by clinical research on nattokinase

  • Supports healthy blood flow to the inner ear
  • May help reduce ringing and tinnitus discomfort
  • Helps maintain normal blood pressure levels in adults
  • Supports arterial flexibility and microcirculation
  • Provides anti-inflammatory support for cardiovascular health
  • Enteric coated for gentle, well-tolerated daily use

Benefits observed in clinical studies of nattokinase when used consistently as part of a healthy lifestyle. Individual results vary.

Nattokinase 4,000 FU — Japanese Fermented Soybean Extract

  • Derived from natto, a traditional Japanese fermented food
  • Naturally rich in fibrinolytic enzymes that support healthy blood viscosity
  • Supports microcirculation to the inner ear and cochlea
  • Enhanced with CoQ10, Turmeric, Ginger, Bromelain, Olive Leaf and White Willow Bark
  • Enteric coated softgels for maximum absorption

Fermentation transforms soybeans into a form that is easier to absorb, better tolerated, and suitable for long-term daily use.

What's NOT Included

  • No artificial colors or preservatives
  • Non-GMO
  • Gluten-free
  • Free from unnecessary additives

Take one softgel daily with a glass of water, preferably during a meal. Nattokinase works by dissolving excess fibrin in the blood — reducing blood viscosity and improving microcirculation throughout the body, including the tiny vessels that supply the inner ear. Better blood flow to the cochlea means the ear receives the oxygen and nutrients it needs to function properly.

The cochlea — the hearing organ in your inner ear — is one of the most blood-flow dependent structures in the body. Even minor reductions in circulation can starve the cochlea of oxygen, leading to the gradual hearing degradation and ringing sounds associated with tinnitus.

Unlike most organs, the cochlea has no backup circulation. When blood flow is restricted, the damage accumulates over time. Supporting healthy circulation is one of the only natural ways to address the root cause of age-related hearing decline.

Varicose veins are often linked to poor blood flow and excess fibrin buildup in the veins, which causes blood to pool and vessels to swell. Nattokinase supports healthy circulation by dissolving excess fibrin and reducing blood viscosity, which may help support vein health over time.

Consistent daily use may support the underlying circulatory conditions associated with varicose vein development. Many customers report improvements in heaviness, swelling, and discomfort in the legs with regular use.

Most people notice subtle changes within 2 to 4 weeks of daily use. For full benefits, including inner ear circulation support, consistent use for 2 to 3 months is recommended.

Many customers report improved overall well-being and reduced ear discomfort during the first month, while deeper circulatory benefits tend to develop more gradually. Because this supplement supports your body's natural processes, results are steady and designed to last.

Yes. Nattokinase has been consumed as part of the traditional Japanese diet for centuries and has been studied in multiple human clinical trials. Our formula is non-GMO, gluten-free, and free from unnecessary additives. As with any supplement, consult your doctor if you are on blood-thinning medication.

If you're not 100% satisfied within the first 30 days, just send it back to us and we'll give you a full refund — no questions asked.

Why Trust Kyoséi
Japanese Nattokinase - 4,000 FU Odorless Softgels

Japanese Nattokinase - 4,000 FU Odorless Softgels

Regular price $45.00
Regular price $45.00 Sale price $90.00
SAVE 50% Sold out
  • I've had ringing in my ears for years and nothing helped. My doctor just told me to live with it. Started Kyoséi about 6 weeks ago and the difference is real — the ringing has noticeably quieted down and I'm finally sleeping through the night again. I'm on my second bottle and not stopping anytime soon.

    Susan T.
  • My doctor told me my circulation wasn't great for my age. I didn't want to go on medication so I started researching natural options and found Kyoséi. Two months in and my blood pressure readings have improved, I feel sharper in the mornings, and my hands and feet aren't cold anymore. Really happy with this.

    Margaret L.
  • I bought this mainly for heart health after my dad had a scare. Three months in and my energy levels are up, brain fog I'd had for years is clearing, and my overall circulation just feels better. My wife noticed the difference before I did. The Japanese ingredient story is real - this isn't just another supplement.

    David M.
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    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    4.8 ★ Customer Rating • Japanese Formula • Third Party Tested • Enteric Coated •

    The Kyoséi Movement

    Over 10,000 Customers
    Supporting Their Circulation Naturally

    Real people. Real results. Backed by Japanese tradition and modern science.

    Kyoséi customers
    Third Party Tested
    Japanese Formula
    Enteric Coated

    5 Clinically Studied Benefits of Japanese Nattokinase

    Kyosei Japanese Nattokinase product

    Japanese Nattokinase 4,000 FU

    Slow fermented nattokinase delivering 4,000 Fibrinolytic Units per serving, enteric coated for maximum absorption.

    Man experiencing ear relief

    Tinnitus & Ear Health Support

    Poor blood flow is the #1 driver of tinnitus. Nattokinase supports circulation to the inner ear to help reduce ringing and discomfort.

    Japanese nattokinase soybeans origin

    The Japanese Blood Flow Enzyme

    Nattokinase dissolves excess fibrin in the blood, restoring circulation to your heart, brain, and inner ear. Discovered in 1980 by Dr. Hiroyuki Sumi.

    Healthy legs varicose vein support

    Supports Vein & Leg Health

    Nattokinase dissolves excess fibrin in the veins, helping reduce swelling, heaviness, and discomfort associated with poor leg circulation.

    Lab tested softgel capsules

    Clean & Tested Quality

    Every batch is third-party lab tested for purity and potency. Non GMO, gluten free, enteric coated. No unnecessary additives.

    Kyosei Japanese Nattokinase product

    Japanese Nattokinase 4,000 FU

    Slow fermented nattokinase delivering 4,000 Fibrinolytic Units per serving, enteric coated for maximum absorption.

    Man experiencing ear relief

    Tinnitus & Ear Health Support

    Poor blood flow is the #1 driver of tinnitus. Nattokinase supports circulation to the inner ear to help reduce ringing and discomfort.

    Japanese nattokinase soybeans origin

    The Japanese Blood Flow Enzyme

    Nattokinase dissolves excess fibrin in the blood, restoring circulation to your heart, brain, and inner ear. Discovered in 1980 by Dr. Hiroyuki Sumi.

    Healthy legs varicose vein support

    Supports Vein & Leg Health

    Nattokinase dissolves excess fibrin in the veins, helping reduce swelling, heaviness, and discomfort associated with poor leg circulation.

    Lab tested softgel capsules

    Clean & Tested Quality

    Every batch is third-party lab tested for purity and potency. Non GMO, gluten free, enteric coated. No unnecessary additives.

    94%

    Noticed improved circulation and blood flow support

    Feeling better cardiovascular wellness within weeks*

    88%

    Said they would continue using Kyoséi daily

    As part of their long term wellness routine

    91%

    Said they were satisfied with product quality

    And would recommend it to others*

    89%

    Reported improvements in energy and vitality

    Feeling better day to day with consistent use*

    Clinically Studied Japanese Nattokinase

    Kyoséi Japanese Nattokinase helps support healthy blood flow, circulation, and whole body wellness.

    Try Risk Free Today
    30 day money back guarantee

    Unlike regular nattokinase supplements,

    Kyoséi supports your circulation & whole body naturally

    Formulated with authentic Japanese nattokinase to help support healthy blood flow, cardiovascular wellness, and whole body vitality.

    Rooted in Japanese Tradition.

    Nattokinase has been consumed in Japan for over 1,000 years, derived from natto, a fermented soybean food long associated with longevity and cardiovascular health.

    Kyosei nattokinase softgel capsule

    Maximum Absorption.

    Our enteric coated softgel bypasses stomach acid, delivering 4,000 FU of active nattokinase directly into the bloodstream where it works best.

    Supports Your Whole System.

    By promoting healthy blood flow throughout the body, nattokinase supports not just your heart, but your brain, joints, and overall vitality.

    Feel Better. Every Day.

    From consistent circulation support to easy daily use, here's what makes Kyoséi® Japanese Nattokinase different.

    Heart & Circulation Support

    4,000 FU Maximum Potency

    Enteric Coated for Absorption

    Third Party Lab Tested

    Kyosei Japanese Nattokinase product bag

    Proven Benefits. Backed by Science.

    Your body deserves more than empty claims. Kyoséi® Japanese Nattokinase supports key areas of daily wellness using ingredients that are studied and trusted.

    Nattokinase is commonly studied for its role in supporting healthy blood flow and vascular function. By helping to dissolve excess fibrin, it supports long term heart wellness as part of a balanced daily routine.
    Better circulation means your body can deliver oxygen and nutrients more efficiently to your brain, muscles, and organs. Nattokinase supports this process naturally, helping you feel more energized and clear throughout the day.
    Standard nattokinase capsules can be degraded by stomach acid before they reach the bloodstream. Our enteric coated softgel bypasses the stomach entirely, releasing 4,000 FU of active nattokinase directly in the small intestine for maximum effectiveness.
    By supporting circulation and healthy blood viscosity, nattokinase fits naturally into daily routines focused on long term wellness. Just one softgel per day with water as part of your morning routine is all it takes.

    Circulation Support

    See the Difference in Your Flow

    Customers commonly report noticeable improvements in circulation and energy with consistent daily use of Kyoséi Japanese Nattokinase.

    Before
    Restricted Blood Flow
    Fibrin deposits narrow the vessel, slowing circulation
    After Kyoséi
    Healthy Blood Flow
    Nattokinase dissolves fibrin, restoring healthy circulation

    Without Support

    Poor Flow

    Restricted

    After 8 Weeks

    Improved

    Healthy Range

    Your Journey with Kyoséi

    What customers typically experience over time with consistent daily use.

    Weeks 1 to 2

    Easy Start

    Simple daily routine with one softgel
    No aftertaste, odor, or digestive discomfort
    Gentle on the stomach and easy to tolerate
    Feeling comfortable staying consistent

    Weeks 3 to 4

    Daily Balance

    Feeling more steady and energized day to day
    Improved sense of overall wellness
    Daily routine feels natural and sustainable
    Circulation support becomes part of your routine*

    Weeks 5 to 8

    Heart & Circulation Support

    Supporting healthy blood flow and circulation*
    Greater confidence in heart and vascular wellness*
    Many customers begin noticing long term trends
    Continued ease of daily use

    Week 8+

    Long Term Wellness

    Ongoing cardiovascular wellness support*
    Whole body vitality through improved blood flow*
    Consistent daily habit designed for long term use
    A routine built around stability, not quick fixes

    Discover Why Experts Trust Japanese Nattokinase

    Elderly couple enjoying healthy lifestyle

    Kyoséi: Simple Daily Blood Flow Support

    Nattokinase has been valued for centuries as part of Japanese wellness traditions. Kyoséi® Japanese Nattokinase offers a simple, odorless way to include this time-tested enzyme in your daily routine. Each softgel delivers 4,000 FU of active nattokinase, carefully formulated for daily use.

    Supports cardiovascular wellness*
    Promotes healthy blood flow and circulation*
    Promotes daily vitality and energy*
    Kyosei nattokinase softgel capsules

    One Powerful Enzyme

    Many supplements rely on complex blends. We keep it focused. Pure Japanese nattokinase at 4,000 FU per serving. Enteric coated to bypass stomach acid and deliver maximum potency directly into the bloodstream.

    4,000 FU nattokinase per softgel
    Enteric coated for superior absorption
    No fillers or unnecessary additives
    Scientists researching nattokinase

    Research & Tradition

    Nattokinase has been the subject of over 17 published studies examining its role in supporting healthy circulation and cardiovascular function. Kyoséi® delivers a consistent daily serving in a convenient softgel format. Designed for long term wellness, not quick fixes. Backed by our 30 day money back guarantee.

    17+ published research studies
    Third party lab tested every batch
    30 day money back guarantee
    30 Day Money Back Guarantee

    Money Back Guarantee!

    Try Kyoséi completely risk free for 30 days. If you are not 100% satisfied with your results, we will refund every penny, no questions asked. We stand behind our premium Japanese Nattokinase because we know it works.

    Try Risk Free Today

    Kyoséi® vs. Other Brands

    Kyosei Japanese Nattokinase
    Kyoséi
    Ships from USA
    🛡️
    3rd Party Tested
    💊
    Enteric Coated
    4,000 FU Potency
    🌿
    No Fillers or Additives
    Other Brands
    Longer Delivery Times
    No Transparent Testing
    Standard Capsule Only
    Lower Potency
    Fillers and Additives
    Noticeable Results in Weeks
    Long Term Wellness Support
    Clean High Quality Formula
    Try Risk Free Today
    30 day money back guarantee

    We are serious about clean health, ask away

    Transparency matters when it comes to daily supplements. Below you will find answers to the most common questions about our Japanese Nattokinase, how it works, what to expect, and how we ensure quality, purity, and consistency in every softgel.

    Nattokinase works differently from most circulation supplements. Rather than relying on vitamins or herbs, it is a fibrinolytic enzyme that actively dissolves excess fibrin in the blood, which is the protein responsible for poor circulation and sluggish blood flow.

    Most standard nattokinase supplements are destroyed by stomach acid before they reach the bloodstream. Kyoséi uses an enteric coated softgel that bypasses the stomach entirely, delivering the full 4,000 FU dose directly where it is needed. This is why so many customers who have tried other products notice a difference with ours.

    Most customers begin noticing improvements in energy and circulation within 2 to 4 weeks, with more noticeable changes by 6 to 8 weeks. Nattokinase works gradually as it helps maintain healthy blood viscosity over time.

    We recommend taking consistently for at least 8 weeks for best results. Results vary by individual. Always consult your doctor before making any changes if you are on medications.

    Most nattokinase supplements use standard capsules that are largely destroyed by stomach acid, meaning a significant portion of the enzyme never reaches the bloodstream. Our enteric coated softgel bypasses the stomach and releases the full 4,000 FU dose in the small intestine where absorption is optimal.

    At 4,000 FU per serving, Kyoséi also delivers double the potency of most standard nattokinase products on the market, which typically offer only 2,000 FU.

    Many customers take Kyoséi alongside their existing routine without issues, but you should always consult your doctor first, especially if you are on blood thinners or anticoagulant medications. Nattokinase has fibrinolytic properties and your healthcare provider should be aware before you add it to your regimen.

    Never stop or change any prescription medications without your doctor's approval.

    We offer a 30 day money back guarantee because we are confident in Kyoséi Japanese Nattokinase. If you do not notice any improvements within 30 days, simply contact us for a full refund. No questions asked, no hassle.

    We stand behind every bottle we sell. Your satisfaction is our priority and we will never make you jump through hoops to get your money back.