Linked from
The 16 pages that link to Ascorbic acid, each with the reason it gives.
GlutathioneRelated: Glutathione can help restore oxidized ascorbate to its active form.
BlanchingRelated: Blanching can reduce vitamin C through heat exposure and leaching into water.
ScurvyRelated: Replacing it treats the underlying deficiency responsible for scurvy.
NitriteRelated: In curing, it accelerates pigment formation and helps limit nitrosamine formation.
Lime juiceRelated: It occurs in lime juice and can slow enzymatic browning in cut foods.