I am Ceyda, engaged in selling Methyl-Sulfonyl-Methane in Russia, thus, it is extremely important for me to select a reliable supplier of Methyl-Sulfonyl-Methane.
Warehouse
Warehouse is also important for Methyl-Sulfonyl-Methane suppliers, Methyl-Sulfonyl-Methane traders make judgments through Methyl-Sulfonyl-Methane market situation. On one hand, while Methyl-Sulfonyl-Methane is in the upside, traders purchase bulk Methyl-Sulfonyl-Methane 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 Methyl-Sulfonyl-Methane in China, thus, supply scale should be important, Methyl-Sulfonyl-Methane suppliers with a certain size suppliers tend to have more bargaining power, in some country, we can even find their Methyl-Sulfonyl-Methane supply volumes through customs data.
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. 
Certificate
A formal operation supplier of food additives normally passes ISO certificate as well as other well-known certificate like halal, kosher, ect.
Shipping and Payment
In order to meets different needs of buyers, according to intercoms, Methyl-Sulfonyl-Methane suppliers often provides several payment ways, such as FOB, L/C, D/P, T/T and so on.
Exquisite Website
Qualified Methyl-Sulfonyl-Methane suppliers tend to have more elaborate and professional web site, with better user experiences and less bugs or faults.
History of Supplier
History counts for a lot, a supplier with long history in the Methyl-Sulfonyl-Methane industry has a wealth of experience to accurately grasp the Methyl-Sulfonyl-Methane 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 Methyl-Sulfonyl-Methane 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.
http://www.foodchemadditives.com/products/methylsulfonylmethane