I’m nether convince or not that scents, additives, etc work or not. And I don’t swallow the ad blurb by so-called “name” anglers they did this, did that, and this bait or that bait caught by far the most fish of the session, season, lifetime. Only to find out the “name” has been sponsored by company who make the bait he/she was plugging 6 months before.
Like it or not, it is NOT scientific testable, repeatable analysis, it is crypto science on a par with Snake oil Sales.
Sorry but the variance of variables is so vast in the water environment you just can not set up a repeatable scientific experiment to test this bait, scent additives, etc against others. And if you think you can, lets be having your experimental design for testing it.
Having said all that, if using it gives you the “confidence” to fish as well as you possibly can do, then it’s done its job. But not for the reasons the makers want you to believe it has.