NAC
N-Acetyl Cysteine, commonly referred to as NAC, is one of three components of phase 1 of the NAC Protocol.
NACET
NACET, or N-Acetylcysteine ethyl ester, is a form of NAC that is more bioavailable.[1] However, it is also more expensive.
Space Cowboy and UNLEAVENS have said that NACET is probably not worth the increased price except for people who demonstrate a sensitivity to plain NAC[2][3].