I've always understood that lead is permanent. The sentiment here is that it isn't permanent.
One of us is wrong, which demonstrates that the net is a bad place to get medical information.
Items that I have and which you can look up:
"Eat Smart" article by Jean Carper, 2-22-98 USA Weekend Edition of Denver Post.
"Vitamin C Found to Lower Levels of Lead in Blood...", 6-29-99 article from "Doctors Guide to the Internet" at
http://docguid.com.
""The Effect of Ascorbic Acid Supplementation on the Blood Lead Levels of Smokers", Journal of the American College of Nutrition, Vol 18, No2, 166-170 (1999).
"The Management of Lead Exposure in Pediatric Populations", Nurse Practitioner, Vol15, No 12 (Dec 1990).
"The Lead Calcium Time Bomb", American Health, Nov. 1990
"Vitamin C Toxicity", Nutrition and Diet Therapy, 3rd Edn, pg 124, West Publishing 1985
"Vitamin C Removes Lead From Blood Stream in Men",
http://psl group/dg/69F56.htm, 4-3-98
"Trace Metal Poisoning" , Cecil Textbook of Medicine, 16th Edn, pg 2218
These are all from the time period that I became concerned due to poor ventilation in or new indoor range (since remedied). I'm sure an internet search would find additional information with more recent dates.
Hopefully this can help some current and future shooters.
We have determined that my high levels were probably originated by washing arms and hands in leaded gasoline after working on cars from about 1956 to 1970s (when unleaded gas became the norm). It was exacerbated by poor ventilation, and poor protection when cleaning the bullet trap (I used a paper suit and breathing mask, but learned later that using a mask with a poor seal is worse than no mask at all, due to increased velocity of air at the leaks - I have a full beard and a mask will not seal).