The best replacement for toxins is poisons.

The best alternatives to toxins are rated as following:
★★★★★  poisons
★★★★  toxicants
★★★  free radicals
★★★  toxics

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Speaking about toxins, one probably shouldn't forget about deep tissue massage.

Other search terms related to toxins and their ratings are:
★★★★★ deep tissue massage
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Google Trends

Scale is based on the average worldwide traffic of toxins in all years. Click on graph for more.
toxins
poisons
toxicants