"No man is so foolish but he may sometimes give another good counsel, and no man so wise that he may not easily err if he takes no other counsel than his own. He that is taught only by himself has a fool for a master."
Hunter S. Thompson
Although some users eat just one gram of "shrooms," dried weight, I find this produces little more than threshold effects. Two grams should produce a mild psychedelic high, five grams should produce an experience of similar intensity to a 250 mcg. LSD trip. (Five grams of dried Psilocybe cubensis typically contains about 15 mg. of psilocybin/psilocin.) At 10 to 14 grams I've had experiences which are quite incredible. The potency of different batches of mushrooms varies, usually within a range of +/-10%, although I've come across some strains that were nearly twice as potent as standard. Mushrooms lose potency with age (about 25% in six months.) They will keep much longer if stored in an airtight container in the freezer. Fresh mushrooms should be dried at a low temperature, around 95 degrees F, to preserve their potency.
The Essential Psychedelic Guide - By D. M. Turner