The use of visualization in athletics has been proven to ameliorate athletic performance across many different sports.

The use of aloe has not been proven to keep weight off.

However, the use of sunscreen has not been proven to lower the risk of melanoma skin cancer.

The use of steroids in children has not been proven to work due to the fact that they seem to recover completely with or without them.

Regular use of multivitamins has not been proven to increase the risk of early or localized prostate cancer.

Its use as a direct control agent was proven in the field.

The use of endothermic materials is established and proven to be sound engineering practice.

In fact, long-term use of beta-blockers has been proven to reduce the risk of another heart attack and death by up to 40 percent.

The repeated use of them is proven by the presence of some chipping from wear.

While disinfectants have been suggested, their routine use to clean brushes has not been proven of value.