so, Linda is reading...

welcome, Linda!

And thanks for the useful information on l-arginine.

now, the real question -- how to tell if it is a quality supplement? I buy "nature valley" from Wal-Mart right now -- but how do I know if it is a good quality supplement?

and where do I find it in liquid form?

I can attest personally to the muscle enhancing benefits, by the way... taken post-workout, it works!