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I take a supplement called Niagen that is a new form of B3 (Niacin is B3) and I noticed an improvement in energy. Niagen (nicotinamide riboside or NR) is a powerful NAD+ booster and is perhaps the most high tech supplement out there. Do a search for it on google and you will see a lot of studies. Read this, longecity.org/forum/topic/8...
The info in that link shows how to regenerate your mitochondria, which in PD has been damaged. They use niacinamide and also NR in the method. It is a very interesting forum thread and can help all of us get some of our energy back.