Looks like you had too much of it yourself :)
The effects of neurotoxicity of lead is studied well enough at this point that anyone calling for _more_ lead in children's diet should themselves get tested for heavy metals or straight up admitted to the hospital,
There is NO SAFE LEVEL of exposure to lead. There is no safe amount of lead in blood. Any amount of lead in the organism is toxic and harmful and really, WTF are you even proposing.
Also in plants lead has exclusively negative effects. Negatively affects growth, photosynthesis, inhibits respiration, disrupts mineral nutrition, etc, etc. Worst of all, it accumulates so then it's transferred up the food chain.
Seriously, get yourself a blood test, something's waaaaay off, no one with IQ above 60-ish and with the access to internet should propose lead supplementing of children.
The studies are all wrong. That's the most dangerous thing about it. It's simply not possible for you as a victim to tell there is anything wrong with you, you can only tell in hindsight.
There are NO safe levels provided by any reputable agency. 72μg you provide is about 20 times HIGHER than 3.5μg above which CDC recommends a corrective action.
"The studies are all wrong" -- show us your published work then, professor. I'm sorry but the level of the harmful communication in your comments would have, at this point, be supported by a massive body of evidence confirmed by irrefutable facts, followed by the Nobel prize in medicine.
I really think that if you're seriously thinking all that, you need help.