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laboratory vs. commercial grade

I found ingredients for PMDD at local chemical supply stores.  I was told
there are two types of KNO3, MgSO4 and K2SO4.  There's the commercial grade
(cheaper) and the laboratory grade (use as analytical reagents for lab
use).  Common sense tells me that it's probably the commercial grade.  Just
to be sure,  what should I get?  Is there an international standard or unit
of measure for chemicals that I should look for?

Thanks in advance.

Jonathan Uy
Cebu, Philippines
5js at usc_edu.ph