You'd get just as much out of it if you just yelled the name of the herb at the bottle. Juliette de Bairacli Levy has provided us with a reliable roadmap for herbal use with our animals. They do work if the herbs are decent quality. Don't expect the same miracles from sawdust. Most of the tinctures on the market today are made in anywhere from 8 hours to 3 days.
Tinctures are usually preferable to tea, because tinctures last indefinitely.
Also, Tinctures enter your system in seconds as compared with dry herbs in capsules, which have to be digested first. Actually, making your own tinctures is relatively simple and can be fun. Needless to say, you need to start out with good quality herbs. Growing your own does give you the advantage of complete control of not only soil conditions but also the proper timing for harvesting. There are many good books on this subject available at health food stores or check your local library.