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Light Salt and Potassium-Chloride Substitutes Explained

Quick answer: Light salt is ordinary salt (sodium chloride) mixed with potassium chloride. A salt substitute is potassium chloride with no sodium at all. Both are cheap ways to get potassium, a mineral that's hard to get on keto because so many potassium-rich foods are starchy. A trial of 20,995 people found a potassium-enriched salt substitute lowered strokes. But too much potassium is dangerous for people whose kidneys can't clear it, so if you have kidney disease or take blood-pressure medication, talk to your doctor first.

In this article

What's actually in the shaker

Product Sodium chloride Potassium chloride What it's good for
Regular salt (table, kosher, sea, pink) All of it None Sodium
Light salt Part Part Sodium and potassium together
Salt substitute None All of it Potassium only

KetoDick describes light salt as a mixture of the two that "gives you the sodium and potassium you need" (from the video) (video lbRPlGZ3Rvw). Any brand works, he says: what you're looking for on the label is potassium chloride (video UygKGoP_BtA). For a pure substitute, he says there's no reason one brand would get it right or wrong, because it's just potassium chloride (video -dHjt_Bpruk).

Why potassium is the hard one on keto

Sodium is easy: salt your food, drink some broth. Potassium is trickier. He points out that many of the foods people think of for potassium, like sweet potatoes and white potatoes, are so high in carbs that you'd blow past keto trying to get enough from them (video lbRPlGZ3Rvw). That's part of why people say potassium is a "problem" with keto.

Sodium and potassium also work as a pair. He stresses they aren't absolute values but a ratio, so too much of one with too little of the other causes trouble (videos lbRPlGZ3Rvw, -dHjt_Bpruk). A potassium salt is a simple way to move both in the right direction.

How KetoDick uses them

His approach changed over time, and he says so.

The arithmetic, from his figures: a quarter teaspoon of substitute is about 640 mg of potassium, and he put three a day at a little over 1,800 mg. He also showed that 3,000 mg of potassium as substitute is a big pile on a dish, more than you'd shake on food without concentrating on it (video -dHjt_Bpruk).

So what you do, if your doctor is fine with it: start with light salt in place of regular salt at the table. It's the gentlest change.

Why not just take potassium pills?

He gives two practical reasons (video -dHjt_Bpruk):

  1. They're small. He says many over-the-counter potassium supplements carry only a few percent of a day's amount, so people end up taking several, which "is really not wise" (from the video).
  2. You can buy the wrong thing. Some potassium products are meant to act as drugs, such as diuretics, rather than as nutrition.

And the bigger one: potassium and magnesium supplements can have kidney implications that eventually affect the heart (video lbRPlGZ3Rvw).

Who needs to ask a doctor first

Too much potassium in the blood (hyperkalaemia) is the risk. Here's who should talk to a doctor before using light salt or a substitute:

The WHO makes the same carve-out in its own guidance (below). This is the one part of keto electrolytes where "ask your doctor" really is the answer, not a formality.

What the research says

KetoDick's take

He calls light salt "reasonably safe" (from the video) as a potassium source and prefers it to pills, with greens covering magnesium and calcium (video lbRPlGZ3Rvw). He also rates it above pink Himalayan salt for keto: it adds potassium, and he calls pink salt's trace minerals insignificant (video UygKGoP_BtA). And in the same breath he says he's not a doctor, and that electrolytes are exactly the area to bring your doctor into (video lbRPlGZ3Rvw).

Key takeaways