The best replacement for horsetail is silica.

The best alternatives to horsetail are rated as following:
★★★★★  silica
★★★  equisetum
★★★  marestail
★★★  equisetum arvense
★  biosil
★  bamboo silica
★  horse chestnut
★  fern

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

Other search terms related to horsetail and their ratings are:
★★★★★ silica
You have in mind a companion for horsetail and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of horsetail in all years. Click on graph for more.
horsetail
silica
equisetum