The best replacement for alkaloids is ephedrine hcl.

The best alternatives to alkaloids are rated as following:
★★★★★  ephedrine hcl
★★★★★  extract
★★★★  ephedra extract
★★★★  ephedra
★  ephedra extracts
★  ephedrine sulfate

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

Other search terms related to alkaloids and their ratings are:
★★★★★ ephedra
★★★★ dragendorff reagent
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alkaloids
ephedrine hcl
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