The best replacement for casein protein is whey.

The best alternatives to casein protein are rated as following:
★★★★★  whey
★★★  cottage cheese
★★  whey protein
★  egg protein
  isolate protein

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Speaking about casein protein, one probably shouldn't forget about zma.

Other search terms related to casein protein and their ratings are:
★★★★★ zma
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Google Trends

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casein protein
whey
cottage cheese