Procaine treatments for cognition and dementia.

Procaine is a controversial substance which has been used for "antiageing" effects including cognitive improvement for more than 50 years.Preparations which contain procaine as a component are claimed to prevent, reverse and interrupt dementia. Several products are widely promoted and can be purchased "over the counter" outside the US and via the Internet. Procaine preparations are said to be readily available in over 70 countries and to be used by more than 100 million people.