The best replacement for soy is whey protein.

The best alternatives to soy are rated as following:
★★★★★  whey protein
★★★★  milk
★★★  whey
★★★  estoy
★★★  almond milk
★★  estar
★  milk formula
★  rice milk
★  soya
★  cow milk
★  dairy
★  skim milk
★  paraffin
★  beeswax candles
★  coconut milk
★  whey protein powder
★  meat
  wax candles
  regular formula
  tofu
  regular milk
  milk based formula
  yo soy
  soy lecithin
  fermented soy
  tamari
  soy
  sunflower lecithin
  paraffin candles
  alimentum
  whole milk
  pea protein
  skim
  thyroid
  nutramigen
  lactose free formula
  lactose free
  rice protein

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

Other search terms related to soy and their ratings are:
★★★★★ estrogen
★★★★★ thyroid problems
★★ thyroid issues
★ whey
★ lecithin
calcium
You have in mind a companion for soy and it is not yet here? Propose!



Google Trends

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