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We have bulk supplies at https://aussie-alum-supplies.com.au
There are better products for cold sores than alum. However, you can buy alum in the spice department in most grocery stores.
It is alum-based baking powder.
Alum can be purchased in a one pound package. It is a granulated powder that is used in pickling recipes, papermaking, dying and coloration.
At any grocery store usually in the spice section because it is mostly sold in powder form.
There are several suppliers on eBay
Aluminum-based baking powder.
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I can't see how.
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