The best replacement for vitamin c is ascorbic acid.

The best alternatives to vitamin c are rated as following:
★★★★★  ascorbic acid
★★★★  ester c
★★★★  calcium
★★★  retinol
★★  vitamin e
★★  zinc
★★  vitamin d
★  retin a
★  vitamin c with rose hips
  airborne
  synthetic vitamin c
  chemotherapy
  echinacea
  natural vitamin c
  lipitor
  vitamin c complex
  vitamin c
  vitamin b
  glycolic acid
  l ascorbic acid
  citric acid
  oranges
  copper peptides
  idebenone
  multivitamins
  statin drugs

Your alternative for vitamin c is not listed? Suggest!
Speaking about vitamin c, one probably shouldn't forget about rose hips.

Other search terms related to vitamin c and their ratings are:
★★★★★ rose hips
★★★★ bioflavonoids
★★★ ascorbic acid
★★ zinc
★★ iron
★ food
★ echinacea
★ citric acid
★ citrus
★ acerola
★ adderall
★ acid
★ bioflavonoids abortion
★ rosehip
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Google Trends

Scale is based on the average worldwide traffic of vitamin c in all years. Click on graph for more.
vitamin c
ascorbic acid
ester c