Deoxyribose suspension
From Memory Alpha, the free Star Trek reference.
Deoxyribose suspension was a fluid derived from DNA.
In 2367, J'Dan used deoxyribose suspension to carry encoded secret information in his bloodstream undetected. The suspensions were prepared in sickbay aboard the USS EnterpriseD by medical technicians, like Simon Tarses. (TNG: "The Drumhead")
