I've now been taking mannitol for 6 months. I've also been taking N-Acetyl-Cysteine (NAC) for 3 months. I've also been doing 40 mins of high-cadence cycling every day for more than 12 months.

Things have been going really well for the past few months. How much of this can be attributed to mannitol, and how much to NAC (or the combination of both!), is not clear to me.

Mannitol might also be neuroprotective. This is something that is best measured over a period of years, rather than a period of months.

Putting a tablespoon of mannitol in my morning coffee each day is not very difficult, so I plan to keep going with the trial at least until my current stock of mannitol is used up (late next year).