My mum is 83, has PD and dementia.
Successes
1. Constipation and digestive issues very much helped with the addition of Motilitone, a prokinetic. Once a day or every other day now. No strain. Zero stress around the issue now. Previously, there was a great deal. Abdominal pains have gone. (We continue to use 200mg mag citrate, Macrogol, 500mg vit c. Mag citrate dose reduced from c 500mg)
2. Sleep has improved with the introduction of melatonin (3mg) and homotaurine (50mg) 2 or 3 hours before bed. (Mum also takes Mirtazapine 30mg but has done for years.) Pretty common for her to sleep right through now. Previously, disturbed nights ( principally dementia confusion) were the norm.
Failures
1. Cue1. Made zero difference and its presence became a source of agitation for mum.
2. Transcutaneous auricular vagus nerve stimulation. Using a TENS machine with an ear clip on the tragus. Zero impact good or bad.