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FYI: S-Factor is stimulant free. Because of this it has to be given a fair amount of time to "kick in". A lot of people notice more strength and stamina before the first bottle is empty. However, for most, the greatest changes take place during the 2nd and 3rd bottles. Those are changes noticed on a daily basis.
But if you're looking for more endurance for a strenuous physical activity like skiing or biking or kayaking (stuff like that) it's possible to notice benefits right away, like the first time you take it. And especially noticeable at higher altitudes because of an increase in oxygen efficiency.
Bottom line, stick with it for a while. You'll be amazed and very satisfied.
Please excuse minor distortions in the photo upload process.