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People just doing keto alone, not even fasting, also benefit heavily from electrolytes. So my answer is yes. Can’t help in the Walmart specific recommendations. Potassium, magnesium, sodium in general though.
I mean if you are doing a dirty fast then perhaps not REALLY? But for the duration you’re going for likely you’ll feel a lot better. Something like liquid IV could do the trick for you or some other low calorie electrolyte powder from Amazon. Really sodium and potassium are key and you can also take a ZMA nightly for the rest.
So many products out there that will likely work for you on your dirty fast.