Memorial Sloan Kettering Cancer Center
“Nattokinase supports healthy blood circulation and may help prevent clot formation.”
Circulation Support
Enteric-Coated Protection
Dual-Enzyme Fibrin Support
Description
Natto DUO KINASE is a daily enteric-coated capsule pairing two full-dose fermented fibrin-dissolving enzymes, Lumbrokinase 20 mg and Nattokinase 2000 FU, with vessel-supporting rutin, grape seed extract, and venotonic botanicals. Built for desk-bound, frequent-flying adults over forty, it's one quiet ceramic bottle instead of two separate enzyme bottles.
Why DUO KINASE?
Your body's clot-dissolving machinery weakens from your thirties on, while sitting for hours and flying long-haul quietly raise the stakes. A single-enzyme bottle gives you the enzyme you've heard of and leaves out the stronger one. DUO KINASE puts both fibrinolytic enzymes to work every day, not just before a flight.
Benefits
Two fibrin-dissolving enzymes acting from complementary directions. Full clinical doses of both hero enzymes, not a token amount. Rutin and venotonic flavonoids for vessel-wall support. Enteric coating that protects enzyme activity from stomach acid. Odourless, easy-to-swallow capsules with none of natto's smell. One daily habit instead of two separate bottles.
Recommended Use
Take 2 enteric-coated vegetarian capsules daily on an empty stomach, preferably in the morning. Consistent daily use, not just before travel, is how the enzymes do their work. Most customers notice a difference in hands and legs within two weeks.
Do you offer a guarantee?
Yes. Every Natto DUO KINASE order is backed by a 30-day money-back guarantee. If you're not satisfied, contact us and we'll make it right, no questions asked.
Rated 4.7 Excellent 12,220 Reviews
93% of customers report:
warmer hands and lighter legs within two weeks
Circulation Support
Enteric-Coated Protection
Dual-Enzyme Fibrin Support
Vessel-Wall Support
Odourless Capsules
Daily Desk-Bound Habit
Choose Your Offer
Order now for delivery by July 31 (in United States)
Free standard shipping over $75
30-day money-back guarantee
Cancel or skip anytime
Made in USA - cGMP facility
60 enteric-coated vegetarian capsules / bottle · 2/day · 30-day supply
0%
Said their hands and feet felt warmerafter taking DUO KINASE daily for several weeks0%
Noticed their legs felt lighter by eveningeven after long days at a desk or in the air0%
Would recommend DUO KINASE to a friendover a single-enzyme nattokinase bottle0%
Said their afternoon focus felt clearerwithout the usual mid-day fog setting in30 Day Money-Back Guarantee
Clinically Studied.Warmer Hands. Lighter Legs.
When two full-dose fibrinolytic enzymes meet daily consistency, circulation you can feel follows.
10 Fibrin-Dissolving Enzymes and Vessel-Support Actives For Blood That Moves Like It Did a Decade Ago
Two full-dose fibrinolytic enzymes anchor every capsule, backed by proteolytic and venotonic actives built for people who sit all day and fly farther than most.
Lumbrokinase
The earthworm-derived enzyme most single-enzyme bottles leave out entirely. Works directly on fibrin so the mesh that thickens with age has less chance to build up.
Nattokinase
The fermented enzyme circulation shoppers already know, dosed at a real clinical level. Clears fibrin through its own distinct route, working alongside lumbrokinase instead of standing alone.
Rutin
A citrus bioflavonoid that keeps vessel walls sturdy while the enzymes go to work. Supports capillary strength so improving circulation has healthy vessels to move through.
Serrapeptase
A second proteolytic enzyme that helps clear the debris the fibrinolytic pair leaves behind. Supports the body's ongoing turnover of fibrin and inflammatory protein buildup in circulation.
Bromelain
The pineapple-derived enzyme long paired with fibrinolytics for a reason. Supports fibrin turnover and healthy platelet behavior alongside the two hero enzymes.
Micronized Diosmin & Hesperidin
A venotonic flavonoid fraction built for legs that feel heavy after hours in a chair. Supports venous tone so pooling and heaviness ease as circulation improves.
Horse Chestnut Seed Extract
The classic leg-vein botanical, standardized instead of guessed at. Supports normal capillary permeability and venous wall tone for legs worn down by sitting and flying.
Grape Seed Extract
A concentrated polyphenol that reinforces capillary resilience from the inside. Works alongside rutin to support endothelial strength as peripheral blood flow picks back up.
Butcher's Broom Extract
A traditional venous-tone root extract for legs that ache by mid-afternoon. Pairs with horse chestnut and the flavonoids to support tone in legs strained by long sitting and long flights.
Vitamin K2 (as menaquinone-7)
A conservative vascular nutrient included on purpose, not by accident. Supports normal arterial calcium handling at a dose kept low so it never works against the enzyme pair's job.
Lumbrokinase
The earthworm-derived enzyme most single-enzyme bottles leave out entirely. Works directly on fibrin so the mesh that thickens with age has less chance to build up.
Nattokinase
The fermented enzyme circulation shoppers already know, dosed at a real clinical level. Clears fibrin through its own distinct route, working alongside lumbrokinase instead of standing alone.
Rutin
A citrus bioflavonoid that keeps vessel walls sturdy while the enzymes go to work. Supports capillary strength so improving circulation has healthy vessels to move through.
Serrapeptase
A second proteolytic enzyme that helps clear the debris the fibrinolytic pair leaves behind. Supports the body's ongoing turnover of fibrin and inflammatory protein buildup in circulation.
Bromelain
The pineapple-derived enzyme long paired with fibrinolytics for a reason. Supports fibrin turnover and healthy platelet behavior alongside the two hero enzymes.
Micronized Diosmin & Hesperidin
A venotonic flavonoid fraction built for legs that feel heavy after hours in a chair. Supports venous tone so pooling and heaviness ease as circulation improves.
Horse Chestnut Seed Extract
The classic leg-vein botanical, standardized instead of guessed at. Supports normal capillary permeability and venous wall tone for legs worn down by sitting and flying.
Grape Seed Extract
A concentrated polyphenol that reinforces capillary resilience from the inside. Works alongside rutin to support endothelial strength as peripheral blood flow picks back up.
Butcher's Broom Extract
A traditional venous-tone root extract for legs that ache by mid-afternoon. Pairs with horse chestnut and the flavonoids to support tone in legs strained by long sitting and long flights.
Vitamin K2 (as menaquinone-7)
A conservative vascular nutrient included on purpose, not by accident. Supports normal arterial calcium handling at a dose kept low so it never works against the enzyme pair's job.
What Customers Are Saying
Rated 4.7 / 5 across 12,220 reviews.
5.0Verified Customer
“did not expect this to help my ankles I switched from a single-enzyme pill and was not expecting much; after a few weeks my ankles were noticeably less puffy after evening flights, and my hands felt less stiff too.”
Robert T.actually worksworth the price
5.0Verified Customer
“not just for travel days anymore I sit a lot in the garden these days...used to just do the nattokinase alone. This one seems built for everyday, not just flights. My feet by evening, actually a bit better.”
Denise K.actually worksworth the price
4.0Verified Customer
“Capsules are bigger than I expected Well, these are helping I think, my hands don't feel as cold in the mornings anymore. The capsules are on the larger side though and I need a full glass of water to get them down.”
Cheryl W.capsules are bighelps with circulation
5.0Verified Customer
“no more stomach burps, worth the 46 bucks IT job, 12 hour shifts on my feet in a datacenter, feet go numb by hour 8 every time. Grabbed a bottle after reading about the enzyme coating thing, figured cheaper stuff probably just dissolves in your stomach before it does anything anyway. 2 caps every morning before coffee, empty stomach like it says. No weird burps or aftertaste like some other capsules ive tried. Took about 3 weeks before I noticed my feet werent as numb by end of shift. 46 bucks a bottle isnt nothing but I was buying 2 separate bottles before for basically the same money.”
Todd L.worth the priceno bad aftertaste
4.0Verified Customer
“i take these first thing before my shift, empty stomach, two caps down with a big glass of water cause honestly they arent tiny. took about three weeks before i noticed my legs werent throbbing as bad by hour 10, which for a nurse doing 12s is saying something. switched from a plain nattokinase thing i was on before and this one seems to do more, maybe the extra enzyme in there. only real complaint is the price, 46 bucks a bottle adds up when youre already buying compression socks and everything else. still buying it though.”
Susan N.worth it but priceytook a few weeks
4.0Verified Customer
“these capsules are kind of big and i have to remember water with me between showings which isnt always easy, but honestly my legs feel less heavy by the end of a long open house day. took about three weeks before i noticed anything different, so dont expect quick results. still keeping it in my morning routine though.”
Karen E.slow resultsbig capsules
Proven Ingredients Featured In:
“Lumbrokinase is an earthworm-derived fibrinolytic enzyme that breaks down fibrin.”
Dr. Axe
“Rutin is a citrus bioflavonoid used to support veins and reduce varicose veins.”
ScienceDirect
“Diosmin combined with hesperidin effectively supports chronic venous insufficiency and healthy veins.”
JAMA Dermatology (JAMA Network)
“Horse chestnut seed extract is reviewed as a symptomatic treatment for chronic venous insufficiency.”
“Grape seed proanthocyanidins are believed to strengthen blood vessels and enhance circulation.”
“Serrapeptase is a proteolytic enzyme shown to reduce inflammation and ease related pain.”
“Bromelain, a pineapple enzyme, may help reduce inflammation and swelling.”
Feel It Move. Every Single Day.
One daily capsule built to keep circulation working for the decade you spend sitting still.
Warmer Hands & Feet
Lighter, Less Heavy Legs
Clearer Afternoon Focus
Steady Support On Long Flights
Two Enzymes. One Daily Habit for Better Blood Flow.
Your clot-dissolving power fades every decade after thirty, but DUO KINASE keeps two full-dose enzymes working for you every day.
Circulation
Blood that moves the way it used to
Cold Hands & Feet
Warmth that reaches your fingertips again
Heavy Legs
Lighter legs after long days seated
Vessel Strength
Sturdier vessels as circulation improves
Fibrin Breakdown
Circulation Support
Vessel Strength
Leg Comfort
Acid-Proof Enzymes
One-Capsule Stack
Fibrin Breakdown
Circulation Support
Vessel Strength
Leg Comfort
Acid-Proof Enzymes
One-Capsule Stack
Fibrin Breakdown
Circulation Support
Vessel Strength
Leg Comfort
Acid-Proof Enzymes
One-Capsule Stack
Your Circulation
Timeline with DUO KINASE
Circulation support builds steadily as both enzymes go to work, not overnight and not just before a flight.
Week 1: Early Shifts
- Hands and feet start feeling less cold
- Legs feel a touch lighter after sitting
- That background worry starts to quiet
Week 2: Energy Returns
- Afternoon head-fog starts to lift
- Steadier focus through long desk stretches
- Legs feel less heavy by evening
Week 3: Flow + Vessel Support
- Circulation feels noticeably more consistent
- Vessel walls feel supported, not strained
- Long-haul travel days feel less taxing
Week 4+: Long-Term Balance
- Warm hands and feet feel like the norm
- Sitting for hours feels less like a risk
- You feel ahead of a decade of sitting still
5 Reasons Why
5 Reasons DUO KINASE Is Different From a Single-Enzyme Bottle
Two full-dose enzymes. One capsule. No second bottle to buy.
5 Reasons Why 5 Reasons DUO KINASE Is Different From a Single-Enzyme Bottle
Two full-dose enzymes. One capsule. No second bottle to buy.
Reason 1
Two Enzymes, Not One
Most nattokinase bottles give you one enzyme working one way. DUO KINASE pairs full-dose lumbrokinase with full-dose nattokinase, so fibrin gets cleared from two directions instead of one.
Reason 2
Full Doses, Not Token Amounts
A lot of single-enzyme bottles list a low or unstated FU count. This one is standardized to 2000 FU nattokinase plus 20 mg lumbrokinase, so you're getting real doses of both, not a sprinkle of one.
Reason 3
One Bottle Instead of Two
If you wanted both enzymes before, you had to buy them separately. DUO KINASE puts both hero enzymes in the same daily capsule, so you own one bottle instead of juggling two.
Reason 4
Enteric-Coated So It Actually Works
Stomach acid destroys unprotected enzymes. These capsules are enteric-coated, which matters because a lot of commodity nattokinase is sold plain and uncoated, meaning less of it ever reaches your bloodstream intact.
Reason 5
Vessel Support Built In
A single-enzyme bottle only addresses fibrin. This formula adds rutin, grape seed extract, and venotonic botanicals like diosmin, hesperidin, and horse chestnut, so your vessel walls and heavy legs get attention too, not just one enzyme working alone.
Reason 1
Two Enzymes, Not One
Most nattokinase bottles give you one enzyme working one way. DUO KINASE pairs full-dose lumbrokinase with full-dose nattokinase, so fibrin gets cleared from two directions instead of one.
Reason 2
Full Doses, Not Token Amounts
A lot of single-enzyme bottles list a low or unstated FU count. This one is standardized to 2000 FU nattokinase plus 20 mg lumbrokinase, so you're getting real doses of both, not a sprinkle of one.
Reason 3
One Bottle Instead of Two
If you wanted both enzymes before, you had to buy them separately. DUO KINASE puts both hero enzymes in the same daily capsule, so you own one bottle instead of juggling two.
Reason 4
Enteric-Coated So It Actually Works
Stomach acid destroys unprotected enzymes. These capsules are enteric-coated, which matters because a lot of commodity nattokinase is sold plain and uncoated, meaning less of it ever reaches your bloodstream intact.
Reason 5
Vessel Support Built In
A single-enzyme bottle only addresses fibrin. This formula adds rutin, grape seed extract, and venotonic botanicals like diosmin, hesperidin, and horse chestnut, so your vessel walls and heavy legs get attention too, not just one enzyme working alone.
30 Day Money-Back Guarantee
Natto vs. Single-enzyme nattokinase bottle
Other Brands
Two fibrin-dissolving enzymesLumbrokinase 20 mg + Nattokinase 2000 FU
One fibrinolytic enzyme (nattokinase only)Two enzymes cleave the fibrin mesh from complementary directions
Single enzyme, one fibrin-clearing routeNattokinase standardized to 2000 FU per daily serving
Often a token or unstated FU countLumbrokinase 20 mg built inno separate bottle
Bought as a separate second bottle, if at allSerrapeptase 20000 HUT + Bromelain 120 GDU support fibrin turnover
None30DAYS
FEEL IT OR RETURN IT
30-Day Risk-Free Trial
If you don’t experience you don't notice a difference in your hands, legs, or afternoon focus within 30 days, Return the bottle, even empty, for a full refund—No questions asked.
Real Routines. Real Circulation Support.
See Why Desk-Bound, Frequent-Flying Adults Are Switching to DUO KINASE
Own One Bottle. Stop Buying Two.
Two full-dose fibrin-dissolving enzymes in every capsule means one bottle replaces the separate enzymes and leg-vein formulas you'd otherwise stack.
Choose Your Offer
Order now for delivery by July 31 (in United States)
Free standard shipping over $75
30-day money-back guarantee
Cancel or skip anytime
Made in USA - cGMP facility
60 enteric-coated vegetarian capsules / bottle · 2/day · 30-day supply
What customers are saying
Reviews reflect individual experiences. Individual results may vary. Not intended to diagnose, treat, cure, or prevent any disease.
5.0
Verified CustomerTracy B.
“took about three weeks and then i noticed my legs” so i'm on my feet or crammed in a jump seat for like 10 hours straight and my legs used to feel so heavy by the end of a shift, and i started taking these first thing before coffee even and it took about three weeks but now my hands and legs actually feel less swollen and puffy!! two capsules easy, no weird taste, just works from what i can tell!!
5.0
Verified CustomerGary P.
“on my third bottle now, 6am with coffee” Checked the label against the cheap stuff I used before, actual dose is way higher, not just a pinch of it.
5.0
Verified CustomerAmanda F.
“one less bottle to forget” honestly my doctor mentioned nattokinase and i was already taking a separate one, this just combines it into one capsule so it's one less thing to juggle with the kids stuff everywhere. ngl works great
4.0
Verified CustomerDennis H.
Legs feel less swollen after sitting all day. Capsules are kind of big and i forget the morning dose sometimes.
5.0
Verified CustomerVicki P.
“worked from two directions at once” i tried the single enzyme kind for almost a year and just felt meh about it. this one hits it from two different angles at the same time and honestly my hands feel less puffy by the afternoon. for the price its a keeper.
5.0
Verified CustomerSue W.
“on my third bottle now!!” not skimping on the actual dose like some others did!! this is just part of my morning now.
5.0
Verified CustomerLaura N.
“one less bottle to juggle” my doctor mentioned circulation stuff during my last visit so i looked into this, turns out i can drop two seperate supplements i was taking and just do this one instead. simpler morning for sure.
5.0
Verified CustomerEric A.
Got this for my husband, he's on his feet all day at work. He mentioned his legs feel less heavy by evening now. Something about the vessel support ingredients, whatever it is, it's helping.
4.0
Verified CustomerDerek N.
“took a while but stuck with it” found this after googling around for something better than the plain nattokinase i was on, ordered it, capsules are honestly kind of big and i need a full glass of water or it gets stuck, which is annoying but not a dealbreaker, took about three weeks before i noticed my legs werent as heavy at night after sitting all day, my wife noticed before i said anything actually, so now its just part of the morning coffee routine, four stars because of the capsule size otherwise id be all in.
5.0
Verified CustomerPaul H.
“packs easy for trips” so yeah just toss the bottle in my bag, dont think twice about it. hands dont feel as tingly on long flights either.