Salt Substitutes Could Fix High Blood Pressure for Millions — But Hardly Anyone Is Using Them

A 20-year national study found salt substitutes effectively reduce blood pressure but almost nobody uses them. Here is the public health failure this represents and what to do about it.

The finding is straightforward and mildly damning: salt substitutes — products that replace some or all of table salt's sodium chloride with potassium chloride, reducing sodium intake while preserving the flavour function that salt provides in cooking — are effective at reducing blood pressure, cheap, widely available, and used by almost nobody who would benefit from them.

A large national analysis spanning nearly two decades of dietary data, published in late March 2026, found that salt substitute usage among Americans with hypertension — the population for whom the benefit-risk calculus is most clearly favourable — is approximately 2-3 percent. This means that 97-98 percent of the people most likely to benefit from a simple, low-cost dietary intervention are not using it.

The blood pressure reduction from consistent salt substitute use is modest but clinically meaningful. Studies have found average systolic blood pressure reductions of 5-8 mmHg in hypertensive individuals — equivalent in cardiovascular risk terms to the effect of the first-line pharmaceutical treatments that doctors routinely prescribe. The population-level impact of achieving this reduction across the tens of millions of Americans and European residents with hypertension would be substantial: reduced rates of heart attack, stroke, and heart failure on a scale that would be genuinely significant in public health terms.

Why is usage so low? The analysis identifies several factors. Healthcare providers rarely recommend salt substitutes specifically — they recommend 'reducing salt' in general terms but do not typically direct patients to the specific product category or explain how to use it. Many patients are unaware that salt substitutes exist as a category. Some who try them dislike the taste difference (potassium chloride has a slightly different flavour profile than sodium chloride) and discontinue without the coaching that would help them adapt.

The public health response to this finding is simple and cheap: healthcare provider education about recommending salt substitutes specifically, consumer awareness campaigns, and clear labelling. The political will to execute a public health intervention this straightforward is, historically, the binding constraint.