As was posted on another thread, LDN is not approved if you are in the Tovaxin clinical trial. That is per OPEXA. The reason: it's not an FDA approved medication to treat MS symptoms and they will not approve it for anyone in the clinical trial. I asked more than once. The response was if you want to take LDN then you are out of the Tovaxin clinical trial, end of story.
“When everything seems to be going against you, remember that the airplane takes off against the wind, not with it.” - Henry Ford