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Doctor's Best, Natto-Serra, 90 Veggie Caps

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Doctor's Best, Natto-Serra, 90 Veggie Caps

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Doctor's Best, Natto-Serra, 90 Veggie Caps

In Stock
  • Expiration Date: October 2020
  • Shipping Weight:
    0.18 lbs
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  • Product Code: DRB-00294
  • UPC Code: 753950002944
  • Package Quantity: 90 Veggie Caps
  • Dimensions:
    2 x 2 x 3.7 in, 0.15 lbs
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Frequently Purchased Together
Product Overview


  • Science-Based Nutrition
  • Helps Support the Circulatory and Immune System
  • Dietary Supplement
  • Vegan
  • Non-GMO
  • Gluten Free

Doctor’s Best Natto-Serra is a combination of two natural enzymes that have been used as dietary supplements for decades. Serrapeptase (serratio-peptidase) 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 of vitamin K. The serrapeptase is formulated with Serrateric, a superior alternative to enteric coating that protects the enzyme until it reaches the instestine for optimal absorption.

  • Helps support the circulatory system
  • Helps support the immune system

Suggested Use

Adult Use: Take 1 capsule daily without food, or as recommended by a nutritionally-informed physician.

Other Ingredients

Serrateric, modified cellulose (vegetarian capsule).

Contains soy.


Do not use this product if you are pregnant or nursing, are allergic to soy, or if you are taking blood thinning medication, consult a physician before taking this product.

Store in a cool dry place.

Supplement Facts
Serving Size: 1 veggie capsule
Servings Per Container: 90 servings
  Amount per serving % Daily Value
Calcium (from Serrateric) 25 mg 2%
Serrapeptase enzyme (serratiopeptidase activity units) 40,000 SPU
Nattokinase (fibrinolytic activity units) 2,000 FU
† Daily Value not established.
iHerb Customer Reviews

BP reduction

Posted by iHerb Customer on January 26 2018 | Verified Purchase

This product has been a revelation my modest hypertension has been dramatically reduced. I have taken it for many months and my doctor was very happy on the last visit. Why join the medical chemistry consumer industry.

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Doctor's Best Natto-Serra

Posted by iHerb Customer on December 27 2017 | Verified Purchase

Somehow make me feel more energetic after starting on these. Overall very satisfied with the product.

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Posted by iHerb Customer on December 4 2017 | Verified Purchase


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Posted by iHerb Customer on August 2 2017 | Verified Purchase

Good for recovery and immune system but I wish I could find ones with better power-value balance as these are lower than average at 40000spu and I didn't notice that mentioned in description

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Posted by iHerb Customer on July 28 2017 | Verified Purchase

Great product , using it for years !!

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