Doctor's Best Natt-Serra (Nattokinase - Serrapeptase) is a combination of two natural enzymes that have been used as dietary supplements for decades and helps support the circulatory and immune systems.

Serrapeptase (serratiopeptidase) is a protein-digesting enzyme isolated from the friendly bacterium Serratia E-15 discovered in the Japanese silkworm.

Nattokinase also digests protein and is derived from "natto", a fermented soy food popular in Japan for centuries. This nattokinase is free from vitamin K.

The serrapeptase is formulated with Serrateric™, a superior alternative to enteric coating that protects the enzyme until it reaches the intestine for optimal absorption.

Benefits

Helps support the circulatory system
Helps support the immune system

Ingredients

Per 1 Veggie Capsule

Calcium (from tricalcium phosphate and calcium stearate in Serrateric) - 29mg

Serrapeptase enzyme (from Serratio sp.) - 40,000 SPU**

Nattokinase (from fibrinase enzyme) - 2,000 FU***

Other ingredients: Serrateric™ (maltodextrin, tricalcium phosphate, calcium stearate, medium chain triglycerides), delayed release capsule (hypromellose, gellan gum, purified water).

Contains Soy

**SPU - serratiopeptidase activity units

***FU - fibrinolytic activity units

Dosage

Take 1 capsule daily without food, or as recommended by your healthcare professional.

Precautions

Keep out of reach of children. Not recommended for individuals who are pregnant, nursing, allergic to soy, or have poor digestion. Consult your doctor before use if taking blood thinners. Stop taking if you experience nausea, vomiting or stomach upsets.

More Information

Natto-Serra combines two enzymes, nattokinase and serrapeptase. Nattokinase is made from fermented soy, while serrapeptase is a proteolytic enzyme, which means it breaks down protein. This kind of blend is usually chosen for circulation support and for people who specifically want both enzymes in one product.

The added Serrateric coating is there to help protect serrapeptase until it reaches the intestine, which matters because enzymes are sensitive to stomach acid. Nattokinase is often discussed for its role in fibrin breakdown, which is why it is commonly used in circulation-focused supplements. Because the formula contains soy and the label advises caution with blood thinners, those details are worth checking before you buy.

FAQ

What are the main enzymes in Natto-Serra?
Natto-Serra contains nattokinase and serrapeptase. Both are protein-digesting enzymes, but nattokinase is better known in circulation supplements, while serrapeptase is often included for broader enzyme support.

Why does Natto-Serra use Serrateric?
Serrateric is used to help protect the serrapeptase until it reaches the intestine. That helps more of the enzyme stay intact on the way through digestion.

What should I know before buying Natto-Serra?
Natto-Serra contains soy and is taken away from food. The label also advises checking with your health professional if you use blood-thinning medication.

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