Barb, LDN is not an I mmune system booster persay....It does raise your endorphin level which in turn, helps to correct your Immune system response as to, not attack your myelin.
Just as the Interferons say they are not IS suppressants(

..they are, rather modulators, LDN is not an IS booster, rather, also a modulator.
Oh and LDN is recommended for all types of MS.