Various additives for sea bait have been around for years.
Three friends and I tested many different ideas over 2/3 years on over 35 boat trips in the UK, fishing at anchor with bait (not lures/pirks).
We have marinated squid in natural oils,such as fish,crab,lobster etc.
Tried to inject worms with the latest "feeding frenzy" artificial chemical.
Used everything from freshwater feeders to old wasing-up liquid bottles to get "stimulants" soaked in sponge,cotton wool,cork etc, down to the "frenzied" fish.
It was almost impossible to field test the efficiency of these methods.
The users sometimes caught more fish,sometimes they didn,t.
When we all used exacly the same bait,rigs etc, some of us caught more than the others.
Sometimes the uptide rods caught more than the "droppers" ,sometimes they didn,t.
Port outfished starboard and then starboard outfished port.
I suspect it will always be like this, especially sea fishing.
We finally lost interest in making someone else rich or performing miracles and went back to enjoying our fishing.
It stopped the charter skippers having a smile as well.
I think if the fish are there and you have a good natural bait, you have as much chance as the angler next to you.
I can,t remember the exact wording,but its something like "If it sounds too good to be true, it probably is".