Boiled sweet

Boiled sweets were a type of confectionery from Earth used on at least two occasions by the Doctor.

The Doctor gives Amy a sweet. (DW: The Vampires of Venice)

Uses

To counteract the ill effects of time spillage on Jamie McCrimmon, the Doctor gave him one of his striped boiled sweets. When Jamie ate it he immediately felt better. (VD: Vortex of Fear)
After healing Amy Pond's wounds from a Saturnynian bite, the Doctor popped what appeared to be a humbug into her mouth. (DW: The Vampires of Venice)