I have been using Dualgen-5 Fast-Dry for just 60 days. I have had ZERO side effects and I have noticed my hair DENSITY and individual hair THICKNESS has improved a great deal. I can no longer see through my hair, which used to be the case! My hair has always been very thin, but I am starting to see a significant difference in FULLNESS. I am using the Dualgen-5 Fast-Dry during the day because it's 1) easy to apply, 2) dries fast, and 3) no causes no mess like the Kirkland stuff! I also like the Essengen-6 Plus for days-time use (if you don't mind Finasteride; I am trying it out now). During the night I use the Kirkland stuff (only because I have a couple bottles left), and in the last week I started using the Dualgen-15 NO PG Plus at bedtime. The products I have purchased here are definitely high-quality, premium Minoxidil/Finasteride products compared to others I've used, so I am very happy to have found them! I was always worried about how Minoxidil products would affect my hair-styling during the day; but DO NOT WORRY use the Dualgen-5 Fast-Dry, or the Essengen-6 plus for day-time use and you will be just fine.