Potato juice is better than eating raw potato, because you have less to eliminate. Those alkaline minerals in the potato are large minerals that remind me of distilled water. The waste from distilleds water is pH 14, pure "lime". Tree lime is better than vegetable lime.................so Maple Syrup is KING. Tap a tree aND DRINK FRESH tree water for the best alkaline source on the planet.
The potato is better than anything commercial, so don't worry about it, but seek fruits as the better deal.