The best replacement for d3 is d2.

The best alternatives to d3 are rated as following:
★★★★★  d2
★★★★  d700
★★★★  d
★★  d3s
★★  d300
★★  vitamin d
★★  d4
★  d800
★  vitamin d2
★  d3x
★  d7000
★  highcharts
★  5d
★  raphael
★  d610
★  d600
  google charts
  poe
  canon 5d
  d2 vitamin
  1d mark iii
  cholecalciferol
  tableau
  z2
  calcium
  avic z2
  d4 honda civic
  j3
  nikon d3s
  processing
  d3
  google visualization
  nikon d700
  d700 nikon
  avic z1

Your alternative for d3 is not listed? Suggest!
Speaking about d3, one probably shouldn't forget about calcium.

Other search terms related to d3 and their ratings are:
★★★★★ calcium
★★★★ k2
★ fish oil
★ meteor
★ vitamin k2
★ cholecalciferol
calcium and magnesium
dx lens
raphael
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Google Trends

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d3
d2
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