You're close here, but you're not quite right. The link that you posted mentions 5 migrograms per deciliter of blood, while your post mentions 5 micrograms per

You're close here, but you're not quite right. The link that you posted mentions 5 migrograms per deciliter of blood, while your post mentions 5 micrograms per decaliter of blood. This is a 100 fold misstatement. A deciliter of blood is 1/10 of a liter, while a decaliter is 10 liters. For reference, I believe that the average adult male has roughly 10L of blood, so 5 micrograms per decaliter would be 5 micrograms in the body of an adult, whereas 5 micrograms per deciliter would be probably something like 5 micrograms in a baby. I don't necessarily trust this site (https://www.healthline.com/health/how-much-blood-in-human-body https://www.healthline.com/health/how-much-blood-in-human-bo...), but it says that babies have ~75 mL (0.075L, or 0.75dL) while the average adult has 4500 - 5700 mL of blood (4.5-5.7L, or 45-57dL, or 0.45-0.57DL). I'm also surprised that the article sticks with their "no lead is good" posture.