The best replacement for lactate is lactic acid.

The best alternatives to lactate are rated as following:
★★★★★  lactic acid
★★★★  calcium citrate
★★★  calcium carbonate
★★  pyruvate
★  magnesium oxide
★  ldh
★  lactose
★  calcium chloride
★  normal saline
  calcium gluconate
  amlactin
  lactic acid level
  lactate dehydrogenase
  lactic
  carbonate
  svo2

Your alternative for lactate is not listed? Suggest!
Speaking about lactate, one probably shouldn't forget about sepsis.

Other search terms related to lactate and their ratings are:
★★★★★ sepsis
★★★ ringer's
★★ d5w
★ abgs
★ acidosis
★ blood gas
urea
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Google Trends

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lactate
lactic acid
calcium citrate