some say vitamin K2 decalcifies the pineal gland and helps produce melatonin?Fourtillan surmised those naturally unable to sufficiently synthetise the melatonin and it's derivative (valentonine, the true sleep hormone) were more prone to Alzheimer and Parkinson.
He managed to conduct a clinical trial with 350 old patients with mostly Parkinson and Alzheimer : he provided them with skin patches containing both melatonin and valentonine, then made public 150 direct accounts; it helped tremendously the majority of them, although of course it never cured them.