Hi Dee,
You are correct that Myralax is not safe and you want to avoid polyethylene glycol.
The ingredient you read on the label of the B12 and the liposomal glutathione from Quicksilver is phosphatidyl choline, which is a healthy and safe, good for the brain, ingredient.
Free glutamate is a problem. It is in really high levels in some foods such as liquid soy milk, but not as easily detected in some products. The bone broth I use in this program is a clean protein source like what you would make at home, but leftover protein that is not frozen can grow histamines very quickly. If your child is sensitive, then freeze the homemade source right away and thaw each time you use it. As far as the glutamate, look into my book, as I do discuss this in detail. Your best choice with healthy foods like bone broth is to put a small amount into a glass and muscle test to see if the product creates weakness or not. If they test strong it is fine, but do remember that if it is leftover (even the next day) the product may have changed if not frozen, so muscle test then again.