The relationships of vitamin D, vitamin D receptor gene polymorphisms, and vitamin D supplementation with Parkinson’s disease

Table 2 Vitamin D₃ supplementation in PD patients

Author	Country	Type of study	Number of participants (T/C)	Intervention	Follow-up	Adverse events
Hiller et al. 2018 [148]	USA	RCT	27/24	Vitamin D₃ 10,000 IU/day	16 weeks	None
Suzuki et al. 2013 [41]	Japan	RCT	56/58	Vitamin D₃ 1200 IU/day	12 months	None

ISSN: 2047-9158