Vitamin C is the absolute best thing in the world you can do for your adrenals. It saved my life when I was at my worst.
The Liposomal vitamin C is basically vitamin C that is coated with lecithin. This makes it 90% more effective because the coating helps it get through your stomach acids and into your small intestines where it is optimally absorbed.
Check out my post above. I provided the links to where I buy my lecithin and how I make the lipo C, as well as the brand of C I use. It's much cheaper to do it this way and works just as well as Lam's stuff, in my opinion. I found it to be much more gentle, and you can adjust the amount of C as you need to when making it yourself.
I was secondary Addison's, but refused hydrocortisone because of the horrible side effects it causes. The lipo C was the best thing I did for myself, supplement-wise.