Clear X-Pill

From Uncle George's letter:"« Clear pills are if you want to avoid the intellectual regression inherent with yellow pills.»"

Primary Effects
Clear Pills make you smarter, but that is only one of their many uses. They can also counter dumbness if taken immediately after becoming slow or dumb. However, the clear pills are the key to taking a large number of pills before passing out, since they can cure the headache.

If taken correctly, Clear Pills can even give you psionic powers or special skills!