You can buy N acetyl cysteine from I herb and vitacost amongst many other places. Its aim in treatment for Cpn is to break open the elementary bodies, rendering them unable to reproduce: http://www.davidwheldon.co.uk/NAC.html
I don't think the L form will work in the same way.
I still take it now because if I should become infected again, it will stop the infection in its tracks and therefore stop MS from rearing its ugly head once more.
An Itinerary in Light and Shadow Completed Dr Charles Stratton / Dr David Wheldon abx regime for aggressive secondary progressive MS in June 2007, after four years. Still improving with no relapses since starting. Can't run but can paint all day.