Henan Julong Biological Engineering Co,.Ltd, is the biggest manufacturer of Feed grade L-Tryptophan ,Feed grade L-Threonine and others Amino Acid in China . Our product have famous and excellent faith and reputation in international market

2.  certificates and License 

The Company has passed the certification of ISO9001 International Quality Management System, ISO24001 Environmental Management System and FAMI QS.

3.    Our factory presented in the VIV Netherlands 2014 , VIV Thailand 2015.

Welcome visit our website to more informations :  

4.   Our professional lab

 We started to produce L-Threonine from 2011. We already have 5 years experience of L-threonine production ,which is the earliest manufacturer in China. 

Q1: Can i get some samples? A: Yes, we can supply the free sample, but the shipping cost be paid by our customers.

Q2: How to start orders or make payments? A: Proforma invoice will be sent first after confirmation of order, enclosed our bank information. Payment by T/T, Western Union or Paypal or Escrow(Alibaba).

Q3: How to confirm the Product Quality before placing orders? A:You can get free samples for some products used to confirm the quality of our products. at same time Welcome visit our facory and see the qualtiy spot.

Q4:Is there a discount? A:Different quantity has different discount.

Q5: How do you treat quality complaint? A:First of all, our quality control will reduce the quality problem to near zero. If there is a real quality problem caused by us, we will send you free goods for replacement or refund your loss. quality problem caused by us, we will send you free goods for replacement or refund your loss.