**Study Summary:**
This clinical trial examines how taking vitamin D3 supplements might help heart nerve function in men with Parkinson's disease who have low vitamin D levels. Parkinson's disease affects the brain and movement and can make the heart's nerves work less effectively. Vitamin D3 is thought to protect nerves and may help balance the body's nervous system, which might improve heart function in these patients.
**Key Points:**
- Participants will take a vitamin D3 pill (50,000 IU) once a week for 8 weeks.
- The study requires heart rate tests before and after the 8-week period.
- Only men aged 51-70, with specific criteria, can join, and certain medications or health issues may exclude participation.
**Eligibility:**
To join, you must be a male with mild to moderate Parkinson's, aged 51-70, and currently taking Levodopa medication. You should not have severe health problems or be on certain medications like blood pressure or heart drugs.
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