Home chemists make speed out of pseudoephedrine.

Q. What ingredients are used to make meth?

A. Over-the-counter cold and asthma medications containing ephedrine or pseudoephedrine, red phosphorous, hydrochloric acid, drain cleaner, battery acid, lye, lantern fuel, and antifreeze are among the ingredients most commonly used.

(From http://www.kci.org/meth_info/faq_meth.htm)