The best replacement for nuun is skratch.

The best alternatives to nuun are rated as following:
★★★★★  skratch
★★★★★  saltstick
★★★★  gu brew
★★★★  cytomax
★★★★  zipfizz
★★★  hammer fizz
★★★  gu
★★★  emergen-c
★★  zym
★★  endurolytes
★  camelbak elixir
★  high 5
★  nuun all day
★  high 5 zero
  ultima
  osmo

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Google Trends

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nuun
skratch
saltstick