https://www.swansonvitamins.com/swanson-premium-nac-n-acetyl-cysteine-600-mg-100-caps
Thanks for the links. NAC also seems to help with certain mental health issues such as depression, anxiety, OCD, etc.
https://www.psychologytoday.com/us/blog/heal-your-brain/201810/nac-the-amino-acid-turns-psychiatry-its-head