The best remedy for keto flu is SALT. If you’re experiencing headaches, fatigue, muscle cramps, and general sluggishness, use more salt. Keto changes the way your body holds on to electrolytes, so some people need much more sodium (salt) when they eat this way. You can use electrolyte powders or drops if you like but it’s fine to just salt your food generously or drink a cup or two of broth made with a bouillon cube. (Check with your doctor first if you have high blood pressure.) A tried-and-true home remedy for severe leg cramps & charley horses is a generous squirt of mustard or pickle juice. (In your mouth, not on your leg!) If you take medicine for diabetes or high blood pressure, feeling unwell can be a sign that your doses need to be adjusted (because the diet is working!), so work with your doctor.