The best replacement for malic acid is citric acid.

The best alternatives to malic acid are rated as following:
★★★★★  citric acid
★★★  maleic acid
★★  magnesium malate
★★  tartaric acid
★  acetic acid
★  malate
  l malic acid

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Speaking about malic acid, one probably shouldn't forget about magnesium.

Other search terms related to malic acid and their ratings are:
★★★★★ magnesium
magnesium supplement
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malic acid
citric acid
maleic acid