The first thing I would do is check with your doctor. Hair loss is not generally considered a typical symptom of Parkinson’s itself.

However, excessive physical or emotional stress can cause temporary hair shedding. The American Academy of Dermatology says this is called telogen effluvium. It often begins a few months after a stressful event, serious illness, surgery, fever, or major weight loss. Continued stress can sometimes make the shedding last longer.

There are many other possible causes, including heredity, thyroid problems, low iron, nutritional deficiencies, autoimmune conditions, weight loss, illness, or certain medications. A doctor or dermatologist can help determine what is actually causing it.

Please check with your doctor.

Another possibility is weight loss. Losing weight quickly can cause hair loss.

Yes, castor oil is skin and hair magic!! The process is a little exhausting and feels weird (like massaging a turkey for the oven, lol) but so worth it!! Added quick fix benefit is a little extra in belly button aids digestion!!

My wife and I Both have slowed or stopped hair loss by applying caster oil directly to the scalp a couple of times a week. It is also very useful if you have dry skin.
I am an 83 year old man with PD (I am in my 14th year since being diagnosed.) My wife is my life partner. We both use caster oil for skin issues.