Red sand

Red sand is a stimulant with biotic-enhancing properties. Its abuse is disproportionately among non-biotic friends and relatives of biotics.

Side effects include red-tinting the user's vision, and longer-term in withdrawal symptoms.

The slang expression for using it is "dusting up".

Speculation
Its description in Ascension is so like that of cocaine that it is perhaps harvested from coca plants irradiated with element zero.

Paul Grayson is one such addict.