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Doctor's Best Best Natto-Serra Circulatory & Immune Support90.0 ea

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  • Dual acting enzyme complex
  • Supports circulatory system
  • Supports immune system

Dietary Supplement

Science Based Nutrition

Dual Acting Enzyme Complex 

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

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 intestine for optimal absorption. 

Serrateric is a trademark of Deerland Enzymes, Inc. 

Contains Nothing Other Than Listed Ingredients


*These statements have not been evaluated by the Food and Drug Administration.  This product is not intended to diagnose, treat, cure or prevent any disease.


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


©Doctor's Best, Inc


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. 


Serrateric, modified cellulose (vegetarian capsule)
Serving Size1 veggie capsule
Serving Per Container90
Amount per Serving%DV
Serrapeptase Enzyme40000SPU


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    Shipping Weight (in lbs): 0.55

    Product in inches (LxWxH): 3.81x 2.12x 3.81

    Item Code: 928580

    UPC: 75395000294

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