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About Nattokinase
Plant: Enzyme from natto (fermented soybeans). Contains soy.
A fibrin-dissolving enzyme, used for biofilm and fibrin nests. A documented alternative to Lumbrokinase, generally considered somewhat less potent but useful if Lumbrokinase is not tolerated or available.
Reference dosing
| Dosing | Allergy Research Group label: 1 softgel (100 mg NSK-SD, 2,000 FU) twice daily with 8 to 10 oz of water, or as directed by your practitioner. Take away from food, as with other enzymes. The Recovery guide also lists 20,000 FU twice daily as a higher-dose option: agree any higher dose with your prescriber. |
Label warnings: use only under medical supervision if you take anticoagulant drugs, and do not use in any condition associated with bleeding. Ask a practitioner first if you are pregnant, breastfeeding, have a health condition or take any medication. Dosed as capsules, not as a tincture.
These are figures from the sources used on this site. They are not a prescription. Follow the product label and your prescriber.
Safety and cautions
Contraindications: Use only under medical supervision if you take anticoagulant drugs, and do not use in any condition associated with bleeding (Allergy Research Group label). Ask a practitioner first if you are pregnant or lactating, have a health condition or take any medication. Made from fermented soybeans, so it contains soy. The product page lists no other drug interactions, which means none are documented there, not that none exist: check with your prescriber or pharmacist.
Herbs can interact with prescription medicines and other supplements. Check with your prescriber or pharmacist first, and do not use herbs in pregnancy or while breastfeeding unless a doctor agrees.
Information last checked: 6 November 2026.
Symptoms linked to this herb
Traditional uses from our symptom map. Not medical advice.
Where to buy
Elovita (UK)Allergy Research Group Nattokinase 100 mg NSK-SD — 180 capsules · £142.95 · Softgels, 100 mg (2,000 FU)BONO (UK)Allergy Research Group Nattokinase 100 mg — 60 softgels · £44.55 · Softgels, 100 mg (2,000 FU)Vitacost (US)Allergy Research Group Nattokinase 100 mg — 60 softgels · $48.99 · Softgels, 100 mg (2,000 FU)Allergy Research Group (US)Nattokinase NSK-SD 100 mg — Allergy Research Group (60 softgels) · $48.99 · Softgels, 100 mg (2,000 FU)NutraMedix US (US)Nattokinase — NutraMedix · See product page · Not a ratio tincture — dosed in drops, see product pageCheck the label and the seller. A link is not a recommendation.
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