The first study presents a summary of ashwaganda. The second paper presents a comparison between PD in India vs PD in other parts of the world.
Second study is long and thorough, not a quick read.
From 2nd, India studies tend to focus on non-motor traits and India genetics.
An Overview on Ashwagandha: A Rasayana (Rejuvenator) of Ayurveda.
ncbi.nlm.nih.gov/pmc/articl...
Research in Parkinson's disease in India: A review.
Pratibha Surathi, Ketan Jhunjhunwala, [...], and Pramod Kumar Pal.
Dihexa peptide shows potential for PD and ALZ and (I believe) is currently available 
citicoline as an adjunct therapy in PD
Benfotiamine In The Mix For PD Again? 
Citicoline in Parkinson's Disease
