Try the pharmacy or the health food store -- I got some pharmaceutical grade (for sore throats and such) at the pharmacy, a couple of years ago.

Often athletes use it to rehydrate (in short, to retain water).

Use at your own risk. Ketosis is ONLY a measure of whether or not you are spilling excess ketones, and nothing else. You can actually gain weight and be in ketosis...it's complicated but that's the bottom line.

Enjoy your reading!