The best replacement for casein is whey.

The best alternatives to casein are rated as following:
★★★★★  whey
★★★  whey protein
★★  creatine
★  lactose
★  cottage cheese
★  whey allergy
★  whey post workout
★  whey at night
★  whey bodybuilding
★  caseinate
  egg protein
  micellar casein
  calcium caseinate
  protein
  lactose intolerance
  whey before bed
  syntha 6
  whey which is better
  mass gainer
  milk protein
  whey formula
  isolate
  dairy
  gluten
  zma
  whey pre workout
  soy protein
  whey protein powders
  whey protein powder
  gouache
  whey better
  calcium casein
  whey powder
  glutamine
  whey in it

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

Other search terms related to casein and their ratings are:
★★★★★ whey
★★★★ milk
★★★★ zma
★★ glutamine
★ whey protein
★ ninhydrin test
You have in mind a companion for casein and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of casein in all years. Click on graph for more.
casein
whey
whey protein