I don't notice a difference. My BP is still high. But I can't monitor the cyst without an MRI, so it may be helping there.
There is no way it *cannot* be beneficial, as onions are very healthy, and juicing concentrates nutrients. No one eats a full raw yellow onion a day otherwise - this is the only way.
I drink one yellow onion (3 inches in diameter), which is about one cup of juice....