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The Food and Drug administration regulates the concentration of alcohol in gel sanitizers. Alcohol is an active ingredient in gel sanitizers. The manufacture must follow very strict FDA guidelines called current Good Manufacturing Practices (cGMPs) when they make their product. The active ingredient must be within 10 percent of the concentration stated on the label 62% plus or minus 6.2%. In addition, the Standard Operating Procedures (SOPs) used during the manufacture are very carefully controlled by guidelines set up by the FDA. During manufacture the product often goes through several stages of testing for the concentration of alcohol. The short answer is the concentration is regulated by the FDA and is carefully controlled.