I am Roshan Indika, engaged in selling Casein in food in Russia, thus, it is extremely important for me to select a reliable supplier of Casein in food.
Google “Company Name”
A renowned company name usually shows a great deal results on Goolge Search, because its company name is frequently searched by their customers or cited by other web sites.
Take “Foodchem International Corporation” as an example, as has been showed in the below picture, there comes out more than 298,000 searching results on Google. 
History of Supplier
History counts for a lot, a supplier with long history in the Casein in food industry has a wealth of experience to accurately grasp the Casein in food market, most of unexpected problems can be solved timely and accurately. The Chinese government gives all the enterprise a issued business license, from which history of enterprises can be found. Under such a fierce competition of Casein in food market, enterprises who can survive over five years can normally be trusted.
The picture below shows the license certificate of Foodchem International Corporation, China’s leading supplier of food additive and food ingredients with establishing year of more than 8.
Location
Generally cargo takes ship delivery; thus, sustainable trading companies tend to set their sites in coast cities, such as Shanghai, Qingdao, and Tianjin in China.
Shipping and Payment
In order to meets different needs of buyers, according to intercoms, Casein in food suppliers often provides several payment ways, such as FOB, L/C, D/P, T/T and so on.
Exquisite Website
Qualified Casein in food suppliers tend to have more elaborate and professional web site, with better user experiences and less bugs or faults.
Google “Website”
While Googling a company website, there will be attached links along with the website on result page. It is an effective and reliable route to judge company scale and brand awareness since not a single company is able to impact Google’s objective valuation towards any company.
Exhibition
Casein suppliers will never ever lose the opportunity to communicate with customers face to face on exhibitions. Although with rapid development of the network, some people choose not to attend exhibitions, while substantial companies still avail these opportunities to meet their clients and looking for potential clients.
Therefore, exhibitions provide a efficient solution to find Casein in food good suppliers: Visit suppliers’ websites to see their participation in the exhibitions.
Warehouse
Warehouse is also important for Casein in food suppliers, Casein in food traders make judgments through Casein in food market situation. On one hand, while Casein in food is in the upside, traders purchase bulk Casein in food for storage, and sell with the price advantage; On the other, vendors need to keep cargo in warehouse in case customers need LCL loaded.
Foodchem International Corporation owns an EDC warehouse in Shanghai, an advanced warehouse system which only few trading companies in Shanghai can provide, it avails fast delivery within 1 week.
Sales of Supplier
There are tons of suppliers of Casein in food in China, thus, supply scale should be important, Casein in food suppliers with a certain size suppliers tend to have more bargaining power, in some country, we can even find their Casein in food supply volumes through customs data.