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About product and suppliers:
        Alibaba.com offers 589 au concentrate products. About 3% of these are air freight. 

A wide variety of au concentrate options are available to you, such as free samples, paid samples. 

There are 589 au concentrate suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of au concentrate respectively. 

Au concentrate products are most popular in North America, Western Europe, and Northern Europe. 

You can ensure product safety by selecting from certified suppliers, including 116 with ISO9001, 4 with Other, and 2 with ISO14001 certification.