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N-acetylcysteine, or NAC, is an over-the-counter compound that can be purchased at your local health food store

Not for long. The U.S. just reclassified it as a drug. [1] I have a few bottles of it, but when they truly expire I will have to make my own.

[1] - https://proteanutrition.com/2021/06/08/fda-changes-in-usage-...

NAC is easily purchased as an OTC supplement to this day. And that's not changing any time soon.
It used to be able to be easily purchasable over Amazon. They removed all listings due to the FDA classification I assume. So not so easily anymore.
I hope you are right. As sp3000 mentioned, it was pulled from Amazon. Walmart still has it for now. There is a store about 40 miles from me that sometimes carry these.