Fish oil, multi, and bcaa's are all good for cutting.
But the only one that will really make a difference is BCAA's. They do a great job of helping you maintain muscle while cutting. The rest I could take or leave.
Keep your protein up and keep your training heavy.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)