Fake salt is a common nickname for salt substitutes, products designed to taste like regular table salt but made partly or entirely from potassium chloride instead of sodium chloride. They exist to help people cut sodium intake without giving up the salty flavor they’re used to in cooking and at the table. Most commercial versions blend about 70% potassium chloride with 30% sodium chloride, though ratios vary by brand. Some also include monosodium glutamate (MSG) or other flavor enhancers to improve the taste.
What’s Actually in Salt Substitutes
Regular table salt is pure sodium chloride. Salt substitutes swap out some or all of that sodium chloride for potassium chloride, a mineral compound that activates many of the same salt-taste receptors on your tongue. The two leading replacement strategies in the food industry are potassium chloride and MSG. MSG contains about one-third the sodium of regular salt, gram for gram (12.28 g of sodium per 100 g compared to 39.34 g in table salt). Replacing just half a teaspoon of regular salt with half a teaspoon of MSG in a recipe can cut sodium by roughly 37%.
Products labeled “lite salt” or “half salt” typically blend sodium chloride and potassium chloride in near-equal proportions. Products labeled “salt substitute” or “salt free” often contain no sodium chloride at all, relying entirely on potassium chloride plus flavor-masking ingredients. You’ll find both types in the spice aisle of most grocery stores, often shelved right next to regular salt.
Why It Tastes Different
If you’ve ever tried a salt substitute and noticed a bitter or metallic aftertaste, that’s potassium chloride. The compound triggers bitter and metallic taste receptors alongside the salt receptors, which regular sodium chloride does not. This is the biggest barrier to wider adoption. Food scientists have found that small amounts of sugar (including trehalose and sucrose) can reduce the bitter-metallic taste of potassium chloride while keeping the salty flavor intact or even enhancing it. That’s why some commercial blends include tiny amounts of sweetener or MSG to smooth out the flavor profile. In cooking, the off-taste is less noticeable in heavily seasoned dishes, soups, and stews than it is when sprinkled straight onto food.
How It Affects Blood Pressure
Salt substitutes work on two fronts: they reduce sodium intake and increase potassium intake. Both shifts push blood pressure in the same direction, downward. A diet high in sodium and low in potassium (the typical Western pattern) causes blood vessels to constrict, increasing resistance to blood flow and raising blood pressure. Boosting potassium while cutting sodium helps relax those blood vessels. It also reactivates several of the body’s built-in blood pressure regulation systems, including hormonal feedback loops that control fluid balance and nerve signals that keep vessels from staying too tight.
The largest trial on salt substitutes, published in the New England Journal of Medicine, followed nearly 21,000 people in rural China over about five years. Participants who used a potassium-enriched salt substitute instead of regular salt had a 14% lower rate of stroke, a 13% lower rate of major cardiovascular events, and a 12% lower rate of death from any cause. These were people who either had a history of stroke or were 60 and older with high blood pressure, so the benefits were measured in a higher-risk group. Still, the results were significant enough that the World Health Organization issued a guideline endorsing potassium-enriched salt substitutes as a population-level strategy for reducing hypertension and cardiovascular disease.
Who Should Be Cautious
The potassium in salt substitutes is harmless for most people. Healthy kidneys efficiently clear excess potassium from the blood. But for people whose kidneys don’t work well, or who take certain medications, extra potassium can build up to dangerous levels, a condition called hyperkalemia. Symptoms include muscle weakness, numbness, and in severe cases, irregular heartbeat.
The highest-risk combination is using a potassium-based salt substitute while also taking blood pressure medications that raise potassium levels on their own. ACE inhibitors (a very common class of blood pressure drug) are the most documented culprit. Potassium-sparing diuretics and certain kidney medications carry the same risk. Case reports have documented life-threatening potassium spikes in people using salt substitutes alongside these drugs, with the salt substitute’s role initially overlooked because clinicians didn’t think to ask about it. If you have chronic kidney disease or take any medication for blood pressure or heart failure, check with your doctor before switching to a potassium-based salt substitute.
How to Use Salt Substitutes in Cooking
You can use salt substitutes in most of the same ways you use regular salt, with a few practical adjustments. Start by replacing only half the salt in a recipe with the substitute, then taste and adjust. This helps you get used to the flavor difference without a dramatic change. Dishes with bold seasonings, garlic, citrus, or acid (like tomato-based sauces) mask the metallic edge of potassium chloride better than plain foods do.
For baking, be more conservative. Salt plays a functional role in bread and pastry beyond flavor, affecting gluten development and yeast activity. Potassium chloride doesn’t behave identically in these reactions, so a full swap can change texture. A 50/50 blend works well in most baked goods without noticeable differences.
MSG is another option if you want to reduce sodium without the metallic taste issue. Because it contains only a third of the sodium in regular salt, you can use it alongside a smaller amount of regular salt to get a savory, rounded flavor at significantly lower sodium levels. This approach is especially effective in soups, stir-fries, and rice dishes.