Can't get into the scientifics about how the Flower Remedies work, but if anything, the 5 flower combination sold as Rescue Remedy definitely works to ease stress.
Case in point, a BC student many years ago started her car, noticed that she left her book on top of the car, got out to get it and the car was somehow driving itself backwards. In a poor move, she attempted to reach in with her hand to hit the brake and it didn't really work and she was dragged accross the parking lot until her car hit another car and stopped. She came in crying and understandably hysterical, with her pants ripped at her thigh and her roadburned skin embedded with asphalt. We immediately gave her Rescue Remedy, she calmed down and was calm thoughout the ride to the hospital and the scrubbing of her thigh with a metal brush to remove the embedded asphalt.
Also, went to a vet some years ago in Morgan Hill to get some shot for a dog I was taking care of before he went into a kennel for a week. The very conventional appearing vet asked why the dog was going to the kennel and I said that I was going to an herbal symposium. He said, "oh yeah, I know about those things, I use that stuff Rescue Remedy on animals when they come in with trauma from accidents. I have even given the drops to an animal lying in the street after being hit by a car." I looked at him and said, "That doesn't sound like standard vetrinary practice." and he said, "No, it isn't, but it works!"
I think that Rescue Remedy should be in EVERYONES home and/or purse. (Especially moms!) The fact of the matter is that works. It alleviate physical and mental stress, but you will never actually feel it working. It just does.
You can buy a cheaper version of it by Healing Herbs brand called Five-Flower Formula.