Vitamin C
From Tardis Wiki, the free Doctor Who reference
Vitamin C was among the remedies Jackie Tyler suggested to treat the newly regenerated Tenth Doctor's neuron implosion on Christmas Eve 2006. (TV: The Christmas Invasion [+]Loading...["The Christmas Invasion (TV story)"])
Beth Halloran claimed to have taken a lot of Vitamin C to explain why she never felt ill. (TV: Sleeper [+]Loading...["Sleeper (TV story)"])