Which brands do you know of that typically do not use extra ingredients in their products? Extra ingredients such as silica, stearates, etc.?
I don't know if it's a brand in particular, or the form of the supplement. The extra ingredients like magnesium stearate are used in the processing of capsules and tablets.
Powdered supplements that aren't in pill form appear to be more natural. I have Now brand L-Glutamine Powder, and it shows 100% free-form L-glutamine and no other ingredients.
__________________ "We can judge the heart of a man by his treatment of animals." ~Immanual Kant~