It’s readily available from many vendors. Just do a web search for: N-Acetyl-Cysteine or N-acetylcysteine.
&&& Which foods have it?
That's a good question and I don't know the answer. L-Cysteine is a nonessential amino acid and so should be present in some protein sources, but that's not, strictly speaking, NAC. I do know that NAC is an antioxidant and a precursor to glutathione. If you learn about some nutritional sources, please let me know.
If you learn about some nutritional sources, please let me know.
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Will do. Thanks.