&gt;Even more frightening is how easy it is to take too much pure caffeine. One brand recommended that consumers use a “1&#x2F;32 teaspoon” to measure a safe amount. For comparison, a “pinch” of salt is generally considered to be one-sixteenth of a teaspoon.<p>If I were going to do something like that I&#x27;d dissolve a teaspoon in two gallons of water and use a cup.<p>Caffeine is one of those drugs that can sneak up on you. LD 50 is actually pretty high - it&#x27;s usually quoted as 75-100 cups of coffee in an adult.  The problem is the curve is wider than most drugs.  Some people can handle truly massive amounts, but you&#x27;re on the other side of the curve you can die from a comparatively small dose.