Aluminum, a strongly suspected neurotoxin, is found in some OTC antacid products (as the hydroxide) such as MAALOX. Read the label! Re PD clustering in welders- it makes a difference what kind of welding; gas (oxyacetylene) welding produces mostly H2O and CO2. Electric welding produces lots of O3 (ozone). I read in several recent journal articles that dopamine, the substance whose replenishment, maintenance, or enhancement is the main object of PD drug therapy, in the wrong places is also toxic! So there! Not being a science boffin, I quote the 18th-century philosopher Alexander Pope: "A little learning is a dangerous thing." J. R. Bruman (818) 789-3694 3527 Cody Road Sherman Oaks, CA 91403