How much do Seedlings benefit from CO2 supplementation ?

I've got 7 seedlings and 1 rooted clone and 1 TBD clone indoors.

The clones are in the window where they get afternoon sun.

The seedlings are under a Screw in LED panel.

I want the seedlings to get some roots going and some "growing momentum". So I can put them outdoors under a very bright sun.

I might go ahead and give them CO2 since I have the sugar yeast etc.

But I wonder what other folks might have observed.

CO2 won't help your seedlings as it isn't your limiting factor. If its only getting afternoon sun then your limiting factor will be light and no amount of CO2 will increase growth rate.