The best replacement for p5p is b6.

The best alternatives to p5p are rated as following:
★★★★★  b6
★★  pyridoxine
  vitamin b6

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Speaking about p5p, one probably shouldn't forget about magnesium glycinate.

Other search terms related to p5p and their ratings are:
★★★★★ magnesium glycinate
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p5p
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