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New Insights on Muscle Strength: The Role of Inhibiting an Enzyme that Hinders NAD+ Synthesis University of Texas Medical Branch researchers show that treating with an inhibitor of an enzyme that breaks down an NAD+ precursor enhances muscle strength and endurance and shortens recovery time in aged mice

The nozzle of the spray bottle should always be kept sterilized and sanitary at all times to prevent any degradation or bacterial contamination of the product

Avoid products in clear glass containers or jars that expose the contents to air and light every time you use them

Thats not realistic for pharmaceutical products