Has nothing to do with the work it does..200 will work..and 200 is a higher level adressed even if the potence is lover than c is..only 12 x is a bit lower in freq than 12 c, and 200x a bit under 200 c but still adress a higer level in the body that 12 does, the general is that 12 hits a bodylevel only, and is only a stimulant, while 30 and above regulates..