Gwern is famous for running lots of self-blinded experiments on himself.
But I guess it varies by individuals so maybe some people would lose it.
I am actually curious enough to try it but I would need to do it next semester or next year because I would need to also buy or secure enough multivitamins for the year (two cures a year, it would not be a double blind anymore if I get them just before the cure) and since some of them are prescription I'll have to talk about it with my doctor, see if he would prescribe enough and if yes, how long is their shelf life and how I would go to get placebos.
So you fill some inert powder into the placebo capsules, just so they have the same weight as the one you crush your non-placebo in.
Life is not just how many years you live, or rigid classifications of diseases