I've been taking Kirkman Labs reduced L-glutathione cream since April 9th.
https://www.kirkmangroup.com/index.php/reduced-l-glutathione-lotion.html
It brought me out of a very low-energy state (physically and cognitively) and brightened my mood. Note that I would not have qualified for Freddd's experiment:
I have been extremely specific about those who tried it and found the reversal. FIRST they had to have effectiveness of the Active B12 protocol.
The active B12 protocol still has the potential to help me (drastically), but I've had to back off due to depletion of B1 & B2 (a combination of ignorance and inability to tolerate the forms of B2 I was trying). In fact, this depletion may be responsible for the extreme brain fog I started to experience after 2 months on the active B12 protocol. I've never had such poor cognitive function.
This should provide another clue about neurological damage: i.e., why I experienced it while failing to follow the protocol correctly (and then improved on reduced glutathione) vs. those who improved on the protocol, but then experienced neurological damage by adding glutathione.
I can't put together a coherent hypothesis about this, but someone else may be able to.
Note that the lotion is a reasonably-priced alternative, as there are 57 doses in a bottle, and it's $30-$36 on Amazon (the price varies). For me, transdermal absorption is generally many times better than oral absorption. The 180-mg dose can't really be compared to what others are taking orally.