Here is what Malcolm Kendrick has to say about potassium:

http://drmalcolmkendrick.org/2013/0...visible-friend/

I've been supplementing with potassium for several years for the same reason that you have, on a low carb diet it seems hard to get adequate potassium. No matter what type of potassium you take, each pill will be only 3% of the RDA so I decided to take 6 pills a day, still only 18% of RDA. Dr Eades of Protein Power recommended potassium supplementation:

"Potassium is linked to sodium. If you lose a lot of sodium through the diuretic effect of the low-carb diet, you’ll ultimately lose a lot of potassium as well. Keeping your sodium intake up as mentioned above will help preserve your potassium as well. And keeping your potassium levels up helps to ensure that you don’t lose a lot of lean muscle mass during your weight loss. Plus, just as with sodium, adequate potassium prevents cramping and fatigue.

You can replace your potassium by taking potassium supplements. In our clinical practice, we gave all patients starting the low-carb diet a prescription for potassium. You can get the same dosage by taking four to five of the over-the-counter 99 mg potassium supplements you can purchase at any health food or natural grocery store.

There are a couple of prescription medicines that you’ve got to be aware of if you markedly increase your potassium intake, so if you’re on blood pressure medicines, ask your doctor if it’s okay for you to take potassium."

I use potassium citrate and have had no ill effects. Whether or not it has helped is hard to say but my blood pressure after many years of being "borderline high" is now in the normal range but I have no way of knowing if the potassium has had anything to do with that.

Jean