The Science of Salt: Why Sodium is a Lifeline for POTS Patients.

If you have been diagnosed with Postural Orthostatic Tachycardia Syndrome (POTS), there is a good chance one of the first things your doctor told you was: "Eat more salt." For most people, that advice sounds completely backwards. We have been told our entire lives that too much salt is bad for us. So why is more sodium one of the most universally recommended treatments for POTS?

The answer lies in the plumbing. Specifically, your plumbing.

What POTS Actually Does to Your Body

POTS is a form of dysautonomia, which is a fancy way of saying that the autonomic nervous system — the autopilot that controls things you never think about, like heart rate, blood pressure, and digestion — is not working the way it should.

In a healthy body, when you stand up, gravity pulls blood downward into your legs and abdomen. Your nervous system instantly compensates by tightening your blood vessels and slightly increasing your heart rate to push that blood back up to your brain. You never notice it happening.

In a body with POTS, that compensation is either too slow, too weak, or both. The result? Blood pools in the lower half of your body, your brain does not get enough of it, and your heart starts racing to try to make up the difference. That is why standing up can feel like running a sprint — dizziness, pounding heart, brain fog, nausea, and sometimes fainting.

The Blood Volume Problem

Here is where it gets really interesting. Research published in the Journal of the American Heart Association and supported by Dysautonomia International has shown that a significant number of POTS patients have what doctors call hypovolemia. That is a clinical term that simply means "not enough blood volume." Studies estimate that many POTS patients are operating with roughly 13% less total blood volume than a healthy person of the same size.

Think of it like a plumbing system. If you have the same pipes but less water running through them, the pressure drops. When you stand up and gravity pulls that already-reduced water supply downward, the pipes in your upper body — including your brain — run close to empty. Your heart has to pump faster and harder just to keep baseline circulation going.

This is not a behavioral problem. It is not anxiety. It is a measurable, physiological deficit in total blood volume, and it is one of the primary drivers of POTS symptoms.

How Sodium Saves the Day

Sodium is the key to unlocking more blood volume. Here is the simplified science:

When you consume sodium (the primary component of salt), it enters your bloodstream through your digestive system. Once there, it does something critical — it holds water. Through a process called osmosis (where water naturally moves toward areas of higher salt concentration), sodium pulls fluid from surrounding tissues into your blood vessels and keeps it there.

More sodium in the bloodstream means more water stays in the bloodstream. More water in the bloodstream means higher blood volume. Higher blood volume means better blood pressure, less pooling in the legs, and less compensatory heart racing when you stand up.

A clinical crossover study published by the National Institutes of Health (NIH) confirmed this directly: POTS patients placed on a high-sodium diet showed measurable increases in both plasma volume and total blood volume. They also showed reduced levels of norepinephrine — a stress hormone that spikes when the body is struggling to maintain blood pressure — and a meaningful decrease in standing heart rate. In other words, the salt was doing exactly what their nervous system could not: keeping enough blood in the right places.

How Much Salt Are We Talking About?

The numbers can be surprising. The general population is often told to limit sodium, while POTS care plans sometimes move in the opposite direction. In some cases, doctors may recommend sodium intake as high as 3,000 to 10,000 mg per day, usually paired with roughly 2 to 3 liters of fluid. That range is not a casual wellness tip. It is a clinician-directed intervention for a specific physiology problem.

• Sodium target: Your doctor may set a target based on your blood pressure, kidney function, medications, symptom pattern, and whether you have low blood volume or blood pooling.
• Salt versus sodium: Sodium chloride is only partly sodium, so salt grams and sodium milligrams are not the same measurement. This is one reason labels and logs matter.
• Fluid intake: Sodium works with water. Extra salt without adequate fluid may not expand blood volume and can leave you thirsty, uncomfortable, or worse.

For the average healthy adult, that kind of sodium intake would raise some eyebrows. For a POTS patient whose clinician is treating low blood volume or poor upright tolerance, it may be appropriate. But it still needs medical context. People with kidney disease, heart failure, uncontrolled high blood pressure, pregnancy-related concerns, adrenal disorders, or certain medication regimens should not self-prescribe high sodium because they read an article on a salt company's website.

The reassuring science is real: controlled research has shown that a high-sodium diet can increase plasma volume and reduce standing heart rate in POTS patients, and short-term data did not show impaired vascular function in that study. The responsible conclusion is not "everyone should take more salt." It is: sodium can be a powerful POTS tool when the right patient uses the right amount with the right medical guidance.

Not All Salt is Created Equal

Getting doctor-directed sodium from food alone can be genuinely hard, especially for those of us who also have to navigate food allergies, MCAS triggers, texture problems, nausea, or days when eating is simply difficult. This is where supplemental sodium products can help: they make the sodium part measurable, repeatable, and easier to pair with fluid.

But electrolyte balance is bigger than sodium. The body also relies on potassium, magnesium, calcium, chloride, phosphate, bicarbonate, kidney function, medications, hormones, food intake, sweat losses, GI losses, and more. That is exactly why we do not add large supplemental doses of potassium or magnesium to our products.

Salty Zebra uses ingredients such as freeze-dried lemon, which naturally contain potassium, magnesium, and other minerals in food-level amounts. What we do not do is turn every serving into a broad mineral supplement. A person with POTS may use very different amounts of our product depending on their clinician's sodium target. If every extra serving also carried a meaningful dose of added potassium or magnesium, we could accidentally push someone's total intake in the wrong direction.

That matters. Too much potassium in the blood can be dangerous, especially for people with kidney disease, heart failure, adrenal problems, diabetes-related complications, or medications that change potassium handling. Too much supplemental magnesium can cause diarrhea, nausea, cramping, low blood pressure, weakness, and in severe cases heart rhythm problems, especially when kidney function is impaired. Over-the-counter electrolyte products can look harmless, but stacking them all day without medical context can create the same problem they are supposed to solve: imbalance.

So our role is intentionally narrow. We are here to be a clean, transparent, MCAS-conscious sodium supplier. We are not trying to manage your entire electrolyte panel, diet, kidney function, medication list, or medical risk profile. That belongs with you and your doctor, pharmacist, dietitian, or care team. In a world full of "more of everything" hydration powders, restraint is part of the formulation.

The Bottom Line

Salt is not the enemy. For millions of people living with POTS, it is one of the most accessible and effective tools for managing daily symptoms. The science is clear: increased sodium intake expands blood volume, reduces standing heart rate, and lowers the stress hormones that make every moment upright feel like a battle.

Of course, every body is different. The specific amount of sodium that works for you should always be discussed with your healthcare team, especially if you have co-existing conditions like hypertension, kidney disease, heart disease, adrenal disease, pregnancy, or medications that affect fluid and electrolytes. The goal is not reckless salting. The goal is enough sodium, enough water, and enough medical context to help your body do the job it has been struggling to do.

Your hydration is not a luxury — it is a lifeline. And we think your lifeline should be delicious.