Saw palmetto is a dwarf palm found in tropical climates that produces berries. These berries contain a naturally occurring substance that may block 5-alpha-reductase. This is the same mechanism by which finasteride works to grow scalp hair when taken orally by men.
All formulations of hand sanitizers are drying to the hands. Ideally, a hand cream should be used after every hand sanitizer use. The best time to apply a hand cream is at bedtime when the hands are rest.
While the CDC (Centers for Disease Control and Prevention) has credited hand sanitizers with minimizing the severity of the flu outbreak last year, there are some important organisms that cannot be killed by any type of hand sanitizer.
Since these devices are sold over-the-counter, no one really wants to know because injection into the skin would technically make the rollers a device that would require Food and Drug Administration attention.