A salt substitute is any seasoning designed to replace regular table salt while delivering less sodium. The most common type swaps some or all of the sodium chloride in regular salt for potassium chloride, a mineral that tastes salty but doesn’t raise blood pressure the way sodium does. Other salt substitutes skip potassium entirely and rely on herb and spice blends, or ingredients like MSG, to make food taste flavorful without added sodium.
How Potassium Chloride Mimics Salt
Regular table salt is sodium chloride. Your tongue detects its saltiness through specific ion channels on taste receptor cells. Potassium chloride activates some of those same channels, which is why it registers as salty. But potassium also triggers receptors involved in bitter and sour taste perception, which explains why many people notice a metallic or bitter aftertaste when using potassium-based substitutes, especially at higher concentrations.
Commercial salt substitutes handle this in different ways. Some products replace 100% of the sodium with potassium chloride, while others use a blend. A common ratio is 75% sodium chloride and 25% potassium chloride, which preserves a more natural salt flavor while still cutting sodium intake by a quarter. That 75/25 blend was the formula used in one of the largest clinical trials on salt substitutes, involving nearly 21,000 participants in China. Food manufacturers sometimes add small amounts of sweetener or flavoring agents to mask the bitterness that potassium chloride can introduce.
Other Types of Salt Substitutes
Not every salt substitute contains potassium chloride. There are two other major categories worth knowing about.
Herb and spice blends are completely sodium-free and potassium-free. A typical recipe combines garlic powder, dried onion, paprika, thyme, and black pepper. These won’t replicate the exact taste of salt, but they add enough flavor complexity that many people find they don’t miss the salt as much. You can buy premixed versions or make your own at home.
MSG (monosodium glutamate) works differently. It delivers umami, the savory depth you taste in mushrooms, aged cheese, and soy sauce. MSG does contain some sodium, but gram for gram it has about two-thirds less sodium than table salt. Research shows that partially replacing salt with MSG can reduce total sodium content by up to 32.5% without changing how acceptable the food tastes to most people. At certain concentrations, MSG also suppresses bitterness and enhances the perception of saltiness, making food taste more seasoned than the actual sodium level would suggest. The catch is that MSG works best in foods that already have a savory profile, like soups, stews, and stir-fries. It won’t do much for your morning eggs or a slice of watermelon.
Blood Pressure and Heart Benefits
The case for salt substitutes is strongest when it comes to cardiovascular health. The World Health Organization recommends adults consume less than 2,000 mg of sodium per day, which works out to just under a teaspoon of regular salt. Most people eat well above that threshold.
Potassium works against sodium in the body. It relaxes artery walls and helps lower blood pressure, essentially counteracting the stiffening effect that excess sodium produces. So potassium-based salt substitutes offer a double benefit: you get less sodium going in and more potassium working in your favor.
The Salt Substitute and Stroke Study, one of the largest trials of its kind, tested a potassium-enriched salt substitute in nearly 21,000 adults who had a history of stroke, were older, or had uncontrolled high blood pressure. The study found that switching to the salt substitute lowered the risk of stroke, total cardiovascular events, and premature death compared to using regular salt. Those are meaningful reductions in a population already at high risk.
Who Should Be Cautious
Potassium-based salt substitutes are not safe for everyone. Your kidneys are responsible for clearing excess potassium from your blood, so anyone with reduced kidney function needs to be careful. The National Kidney Foundation advises people with kidney disease to avoid salt substitutes containing potassium chloride entirely, noting that excess potassium can actually be more harmful to them than excess sodium. When potassium builds up in the blood, a condition called hyperkalemia, it can cause dangerous heart rhythm problems.
Certain medications also raise the risk. Blood pressure drugs that block the renin-angiotensin system (commonly prescribed for hypertension and heart failure) reduce the body’s ability to excrete potassium. Potassium-sparing diuretics have the same effect. Case reports have documented life-threatening potassium spikes in people who combined these medications with potassium-based salt substitutes. If you take blood pressure or heart medications, check with your pharmacist or doctor before switching to a potassium-containing product. Herb-only blends and MSG-based options don’t carry this risk.
Tips for Using Salt Substitutes in Cooking
If you’re trying a potassium chloride product for the first time, start by blending it with regular salt rather than replacing salt completely. A 50/50 mix is enough for most people to notice a sodium reduction without detecting the metallic edge. Over a few weeks, you can gradually shift the ratio.
Adding a small amount of acid, like a squeeze of lemon or a splash of vinegar, can also mask bitterness and brighten the overall flavor of a dish. The same goes for a pinch of sugar or a touch of honey in savory recipes. These tricks work because sweetness and acidity both compete with bitter taste signals on the tongue.
For people who find any amount of potassium chloride off-putting, herb and spice blends are a practical alternative. Building a shaker with garlic powder, onion, paprika, thyme, and pepper gives you a go-to seasoning that works on roasted vegetables, grilled meat, eggs, and salads. The flavor profile is different from salt, but the goal isn’t to perfectly replicate saltiness. It’s to make food satisfying enough that you don’t reach for the salt shaker.
MSG can fill in gaps where herbs alone fall short, particularly in liquid-based dishes. Adding a small amount to soups, sauces, and grain bowls creates a rounded savory flavor that makes the dish taste more seasoned overall. In studies, panelists rated soups made with a combination of reduced salt, potassium chloride, and MSG as equally salty or even saltier than full-sodium versions, with no off-flavors.