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Chemical structure of d-lysergic acidImage via Wikipedia LSD — LSD Symposium: "LSD

Explanations on the Three Most Misunderstood Letters in the History of Science

Lysergic acid diethylamide, abbreviated 'LSD', is a derivative of lysergic acid which occurs in the alkaloids (nitrogen compounds) of ergot (permanent form of the ergot fungus) growing on cereals and grasses. Already in the microgram (the millionth part of a gram) area the colorless LSD crystals have a mind-altering effect. The threshold dose for slight bodily and weak psychic effects for most people is under 25 microgram; at techno parties the doses usually are 50 to 150 microgram; during the hippie area 300 microgram were prefered; within therapeutical frameworks up to 850 microgram are used. (A fatal LSD dosis for humans is not known.) On the black market LSD mostly is sold in the form of paper trips ('blotter acid' or 'tickets'), or as micro tablets containing between 50 and 250 microgramm of the active substance."

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