Yes, the potassium chloride; definitely has effect on energy levels. But also great as a sleep aid.
Been an insomniac for a couple of decades; so anything I took right before bedtime used to disturb me.
By doing I found out that potassium chloride in water, mixed with magnesium chloride, +a little lithium chloride; is the best night cap for me ever.
Keeps me from awaking 4 o clock (adrenal time) also prevents the jolts I used to have when going to sleep, sound sensitivity etc.(magnesium deficiency)