Do Arnica and Bromelain REALLY help with swelling or is it just hogwash?

Many of the women on the facelift forums say they took Arnica and Bromelain prior to their facelift to help with swelling. Others say their doctors told them that was nonsense and just to avoid salt, alcohol, too much sugar and anything that causes bleeding like Vit E, aspirin, Ibuprofen etc. SO: Do any doctors here think that Arnica/Brom actually work? I'm extremely skeptical about supplements and think they are mostly just nonsense.