Swimmers are also at risk. Copper is a popular algaecide in commercial and residential pools. The metal can leach into your skin with enough exposure. Too much salt can slow hair growth. If you aren't intimate friends with your salt shaker, the answer could be too much stress.
Stress naturally increases sodium retention.
If water is the problem, drink bottled water. Also, avoid foods high in copper. That list is on the Wild Yam Cream page. Don't salt your foods. Eat a low sodium diet.