Your Cart is Empty
But it doesn't have to be.
Continue Shopping.
Added to Cart
Combo Discount:
View/Edit Cart Checkout
Cart Total:
Customers Also Bought:

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

By Doctor's Best

Our Price:
You Save:
$17.63 (46)
  • Volume Discount
  • Buy 4+
    Save 5%
Earn 10% Loyalty Credit ?

This product is already in your Wish List.

View Wish List

This product is now in your Wish List.

In Stock
  • Product Code: DRB-00294
  • UPC Code: 753950002944
  • Package Quantity: 90 Veggie Caps
  • Dimensions: 2 x 2 x 3.7 in, 0.15 lbs (0.07 kg)
Bundle Offer
Save $2.00 when you purchase these items today for only $24.31


Combo Discount:



- $2.00


Product Overview

  • Science-Based Nutrition
  • Dietary Supplement
  • Dual Acting Enzyme Complex For Circulatory & Immune Support
  • Vegan
  • Non-GMO
  • Gluten Free

Best Natto-Serra is a combination of two natural enzymes that have been used as dietary supplements for decades. 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 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.

Helps support for the circulatory system

Helps support for the immune system

Suggested Use

Adult Use: Take 1 capsule up to 3 times 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 have a blood coagulation disorder. If you are taking an anticoagulant (blood-thinning medication) or vitamin K, consult a physician before taking this product.

Store in a cool dry place.

Visit Manufacturer's Website
Supplement Facts
Serving Size: 1 capsule
Servings Per Container: 90 servings
  Amount per serving % Daily Value
Calcium (from Serrateric) 24.5 mg 2%
Serrapeptase enzyme (serratiopeptidase activity units) 40,000 SPU
Nattokinase (fibrinolytic activity units) 2,000 FU
† Daily Value not established.

iHerb Customer Reviews

5 Stars
4 Stars
3 Stars
2 Stars
1 Stars


Posted by 5759480097669834289 on May 02, 2016

This product appears to be doing what it is supposed to do . . . ie reduce arterial deposits.

Was this review helpful to you?

This has cleared the congested veins in my leg that formed after trauma.

Posted by Reviewer1617056 on Apr 21, 2016

I broke my leg. Blood and lymph poured though my blood vessels in my leg and my veins couldn't clear all of it. The result a big purple patch on my foot and lower leg and impeded circulation. This gradually got bigger over two years and I started to limp. My foot hurt ! Then I read about Nattokinase which dissolves micro-blood clots and Serrapeptase which dissolves protein material. I started using the Doctor's Best Natto-Serra and the purple patch began to shrink and circulation began to be restored. Slowly but surely. Nothing else worked, Obviously I love the product and will keep using it until the affected leg and foot parts are totally clear and rejuvenated.

Was this review helpful to you?

thank you for this

Posted by 4676627497539146549 on Feb 20, 2016

is very good :)

Was this review helpful to you?

Good product

Posted by Reviewer1418149 on Apr 29, 2015

Keeps me regular, and helps my circulation.

Was this review helpful to you?

Quality and value

Posted by Reviewer1148576 on Feb 11, 2015

Taking 3 caps per nigh (1 hour after food or 4 hours after) to treat a Central Vein Retinal Occlusion along with 1 capsule Now Pine Bark Extract as an anti-inflammatory which also helps with pain relief. Very pleased with the results so far. The specialist was very surprised to see how much improved my eye was after taking this combination for 2 weeks. N.B. My blood pressure has dropped considerably since taking this. So if you have low BP or Orthostatic Intolerance, bear that in mind before taking this product.

Was this review helpful to you?

See All Reviews