Some of the ingredients in PerformElite are most effective when they are used daily. Beta-alanine is one of the ingredients that "loads" itself into the muscles, and skipping a day of consuming the beta-alanine in PerformElite will reduce muscle concentrations of beta-alanine.
Conversely, some people build up a tolerance to caffeine over time with regular use. Therefore, once every 1-3 months, you may want to not consume any products that contain caffeine (PerformElite, coffee, soda, etc.) for 3-5 days to "reset" your sensitivity to caffeine.
You can also use PerformElite Caffeine Free on your recovery/easy/off training days to keep certain ingredients loaded without having to consume the caffeine found in our regular PerformElite.