Since this electrolyte powder has less then 50 calories per serving, it's a good drink option during intermittent fasting.

Can I take electrolytes while fasting?

No, electrolytes shouldn't interfere with a fast. They don't have calories, so they don't stimulate pro-growth pathways like mTOR (which is activated by carbs/insulin, and branched-chain amino acids).

Does Ultima Replenisher raise blood sugar?

It has zero sugar and zero calories and is totally keto-friendly. They taste like popular sports drinks, but with less chemicals and less sugar.