FU: the unit on the label

The amount of nattokinase is expressed on the label in FU (Fibrinolytic Units), a standardised laboratory measure of enzyme activity. Labels show, for example, 2,000 FU per capsule. That figure says more about the amount of enzyme than the number of milligrams.

• Compare products on FU per recommended daily dose, not on milligrams.
• Natto naturally contains vitamin K2; some nattokinase supplements are purified so that they contain no K2. The label will say so.
• Nattokinase comes from soy. Soy is an allergen; check the allergen information on the label.

How nattokinase is offered

Nattokinase is offered as a single-ingredient formula and in combination with other enzymes, usually in capsules. You will find all options in our enzymes collection. Examples from our range, with the dosage according to the label:

• Doctor's Best Nattokinase 2,000 FU – 2,000 FU per vegetarian capsule; 1 capsule a day between meals. Also available as 270 capsules.
• Vitals Nattokinase NSK – 100 mg fermented soybean extract (NSK-SD®) providing 2,000 FU per capsule; 1 capsule a day with a meal.
• Arthur Andrew Medical Nattovéna® – the label states 4,000 FU nattokinase; 2 capsules a day, up to 4 capsules a day, on an empty stomach.

If you want to compare nattokinase products, look at these points:

• Amount: expressed in FU per capsule and per recommended daily dose.
• K2: does the product contain K2, or has it been purified of it?
• Allergens: soy; check the allergen information.
• Capsule: plant-based or not, if you follow a vegan diet.
• Medication, pregnancy, breastfeeding or planned surgery: consult your doctor first and read the warnings on the label.

Do not exceed the recommended daily dose. Keep out of the reach of young children.

A food supplement is not a substitute for a varied, balanced diet and a healthy lifestyle.

No health claims are authorised in the EU for nattokinase. This article contains general product information and is not medical advice.