Hair is an excellent indicator of lead toxicity. Lead is a cumulative toxin that is retained in the central nervous system, bones, brain, glands, and hair. For children, 1 ppm has been found to correlate with increased risk of hyperactivity; over 3 ppm increases the risk of learning disabilities. Sources of exogenous lead are:
- Bone meal
- Car batteries
- Canned fruit/juices
- Ceramic glazes
- Cigarette ash
- Eating utensils
- Auto exhaust
- Leaded gasoline
- Hair dyes
- Insecticides
- Lead crystal dishes and glassware
- Lead refineries
- Lead smelters
- Lead water pipes
- Mascara
- Evaporated milk
| - Organ meats
- Lead-based paint
- Pesticides
- Porcelain glazed sinks and bathtubs
- Produce (near roads)
- Putty
- PVC containers
- Rainwater
- Solder
- Tobacco, pre 1986 (50% lead)
- Toothpaste
- Toys (especially those from China)
- Vinyl mini-blinds
- Water, city and well
- Wine
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