Ken Allan and an ETSU student (I knew that moved away) both tested my initial tincture against sinemet ...results were 2 drops tincture had approx 1 mg L-dopa. Ken Allan used kitchen testing/ ETSU expensive equipment and both got the same...pretty cool. I have since made tinctures of different plant parts (both dried and not dried that I would like tested) When I have a minute, I will look up Ken Allan's proceedure for the kitchen experient test and share it.