The best replacement for zinc acetate is zinc oxide.

The best alternatives to zinc acetate are rated as following:
★★★★★  zinc oxide
★★★★★  zinc gluconate
★★★★  zinc sulfate
★★  gluconate
★  calamine
★  zinc sulphate

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Speaking about zinc acetate, one probably shouldn't forget about erythromycin.

Other search terms related to zinc acetate and their ratings are:
★★★★★ erythromycin
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zinc acetate
zinc oxide
zinc gluconate