Why not wear a N95 or better mask while shooting at the indoor range?
When you leave, make sure to wash your hands and blow your nose (especially the blow-your-nose part if you *dont* wear a mask)
And it wouldn't hurt to take a daily vitamin C and a couple of Tums (calcium) -- but don't take them at the same time. Take one in the morning at the other at night. The calcium is to help your bones keep from absorbing lead. Not sure if it will drive out the lead that's already in your bones, but they will turn loose of it eventually and you pee it out.
"The only way to stop a bad guy with a gun is with a good guy with a gun"