Do yogurt's contain salt?
Yogurt doesn't contain salt.
Typically, the "higher end" brands of yogurts will not use gelatin. (Gelatin is usually used to thicken yogurt that is slightly watery, which is usually the case in cheaper yogurts and diet yogurts.) In the UK, Rachel's, Yeo Valley and Pearl du Lait do not contain gelatin. If you get really stuck, you can make your own yogurt quite easily.