I've tried multiple things over the years with no improvement.

Are there any studies with results showing this as a suitable way to reduce tremors?

There are some indications that specific beta-carbolines (harman/norharman) could be a causative factor in genetically predisposed people. Coffee, tobacco smoke and fried/grilled food are the most significant sources.

See e.g. https://link.springer.com/article/10.1007/s12311-015-0751-z