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We Need to Talk About Electrolytes

Electrolyte products are everywhere. But what do they actually do, how much do you need, and when do they matter? We break down the science without the sales pitch.

Max Stephens

5/11/2026

Walk through a supermarket or listen to any podcast lately and you'll see it. Electrolyte powders, hydration packets, performance drinks. Every brand has one now. Different packaging, different claims, same promise.

This doesn't make them bad. Some of them are genuinely useful. But the way this category has exploded makes one thing clear: there is a lot of marketing, a lot of money being made, and not nearly enough clarity on what is actually going on inside your body.

Most companies build the product first, then shape the message around it. If the goal is actually to help people feel better, the starting point should be a different question entirely. What does each electrolyte actually do? How much are we already getting? How much do we need? And when does any of this actually matter?

Let's get into it.

What are electrolytes, exactly?

Electrolytes are minerals that carry an electrical charge in your body. That charge is what allows your nerves to fire, your muscles to contract, and your cells to manage fluid properly. Without them, water doesn't get used efficiently. It just passes through you.

There are seven electrolytes in the human body: sodium, potassium, magnesium, calcium, chloride, phosphate, and bicarbonate. The four that most directly affect how you feel, perform, and recover are sodium, potassium, magnesium, and calcium. Those are the ones worth understanding.

Sodium

Sodium is the most misunderstood one. It has a bad reputation because of its connection to processed food and blood pressure. But sodium itself isn't the problem. It's essential.

It regulates fluid balance, supports nerve function, and plays a key role in maintaining blood volume. Without enough of it, your body can't hold onto water properly. That's when hydration starts to break down. When you sweat, sodium is the primary mineral you lose.

Most people on a standard diet consume plenty of sodium. If your meals include packaged or restaurant food, you're probably getting more than enough without thinking about it. The average American takes in over 3,000 milligrams a day, while general recommendations sit around 2,300. That's where the "cut your sodium" messaging comes from. But that advice is aimed at people eating highly processed diets, not active people sweating regularly and eating mostly whole foods.

Once activity increases, the math changes. Most people training regularly should aim somewhere between 3,000 and 6,000 milligrams per day. For heavier training, longer sessions, or hot conditions, that range can climb to 4,000 to 8,000 milligrams or more.

A useful way to think about it is sweat loss. You lose roughly 500 to 1,000 milligrams of sodium per hour of sweating, sometimes more. If you get white salt marks on your clothes, stinging sweat in your eyes, or a gritty feeling on your skin during hard efforts, you're a salty sweater and you're losing more than average.

Here's where it gets counterintuitive. If you clean up your diet and start cooking most of your own food, sodium can drop fast. Whole foods are naturally low in it. Add in more water and you can unintentionally dilute what's already in your system. That shows up as fatigue, headaches, dizziness when you stand up, flat workouts, and cravings for salty food. On paper it looks like you're doing everything right. In practice, your body is telling you something is off.

The simplest fix is usually the right one. Salt your food. Pay attention to how you feel during and after workouts. If energy is stable and you're not dealing with headaches or lightheadedness, you're probably in a decent range.

Potassium

Potassium works alongside sodium. While sodium largely operates outside your cells, potassium works inside them. Together they maintain fluid balance and support muscle and nerve activity. Sodium helps you hold onto fluid. Potassium helps direct where that fluid goes.

The recommended intake is around 3,500 to 4,700 milligrams per day. Most people don't come close.

Potassium is found in potatoes, bananas, avocados, spinach, beans, and yogurt. A medium potato gives you around 900 milligrams. A banana is closer to 400. An avocado around 700. Those are solid numbers, but they add up slower than you'd expect. One banana isn't going to get you there.

The practical approach is building meals around potassium-rich foods rather than treating them as side notes. A meal with potatoes and greens, or beans and vegetables, moves the needle in a way that a banana on the side doesn't.

Low potassium shows up as fatigue, muscle weakness, or that flat feeling in workouts where your muscles just don't fire the way you expect. If sodium is the electrolyte people obsess over, potassium is the one they quietly ignore. And in a lot of cases, bringing it up matters just as much.

Magnesium

Magnesium supports muscle relaxation, helps regulate the nervous system, and is involved in hundreds of processes in the body. Where calcium helps muscles contract, magnesium helps them release. Where stress ramps things up, magnesium helps bring things back down.

When it's low, the symptoms aren't always obvious at first. Muscle tightness is a common one, not full cramps, just that constant stiffness or twitching. Sleep can feel off. You're tired but your body doesn't fully settle. Some people notice more irritability or that wired feeling late at night when they should be winding down. Low magnesium can also make it harder for your body to properly use potassium and sodium, so if you're doing everything else right and still feel off, magnesium is often part of the missing piece.

Recommended intake is roughly 300 to 400 milligrams per day. A lot of people fall short, especially if their diet lacks nuts, seeds, leafy greens, and whole grains. Stress, exercise, alcohol, and caffeine can all increase your needs or accelerate losses.

If you're going to supplement one electrolyte, magnesium is probably the one. But not all forms are equal.

Magnesium glycinate is well absorbed and tends to have a calming effect, which is why most people take it at night. Magnesium citrate is also well absorbed but can have a mild laxative effect at higher doses. Magnesium oxide is cheap and common in store brands, but the absorption is poor. The milligram number on the label looks impressive. Your body won't use much of it.

Starting around 200 to 400 milligrams in the evening is a reasonable place to begin. Better sleep, less muscle tension, and a more relaxed baseline are all signs it's working.

Calcium

Calcium is usually associated with bone health, and that's fair, but it doesn't stop there. It also plays a direct role in muscle contraction, nerve signaling, and heart rhythm. Every time a muscle contracts, calcium is involved. That includes everything from picking something up off the floor to your heart beating. Magnesium helps muscles relax, but calcium is what initiates the contraction in the first place.

The recommended intake is around 1,000 milligrams per day for most adults. Unlike potassium and magnesium, a lot of people do hit this, but it depends heavily on diet. Dairy is the most common source. Where intake drops is when dairy is removed and not intentionally replaced.

Absorption matters as much as intake here. Without enough vitamin D, calcium absorption drops significantly. That's why the two are often paired together. Getting calcium in your diet is one thing. Using it properly is another.

Why ratios matter more than totals

Your body doesn't run on individual numbers. It runs on ratios.

Think of sodium and potassium as a push and pull system. Sodium controls fluid outside your cells. Potassium controls fluid inside them. When they're in balance, water moves where it's supposed to. Muscles contract and relax cleanly. Nerves fire the way they should.

When that balance shifts, things feel off. High sodium with low potassium leads to fluid retention outside the cells, that heavy sluggish feeling, higher blood pressure, and muscles that don't respond the way you want. Historically, humans consumed far more potassium than sodium. Today that ratio has flipped for most people, and that imbalance is where a lot of issues start.

Magnesium sits underneath all of this. It helps regulate how sodium and potassium move in and out of your cells. Without enough of it, the whole system becomes less efficient. You can be taking in the right amounts of everything else and still feel off if magnesium is low.

Calcium and magnesium have their own balance too. Calcium drives contraction, magnesium drives relaxation. Too much calcium relative to magnesium can lead to tightness. Too little calcium affects contraction strength and nerve signaling.

More is not always better. Balance is what matters.

What to actually do about it

Start with food. That's the most natural way to cover your bases and the most sustainable.

Salt your food to taste, especially if you're active and eating mostly whole foods. Focus on potassium-rich meals. Potatoes are underrated here, one of the most efficient sources you can eat. Beans, lentils, leafy greens, and avocados all help. Include magnesium sources regularly: pumpkin seeds, almonds, spinach, dark chocolate. If your diet consistently covers those, you're already ahead of most people.

Supplementation makes sense when your needs are higher than food can cover. The simplest option is adding electrolytes to water. That can be as basic as a pinch of salt and a squeeze of lemon or a powder.

A word on electrolyte packets

When you're evaluating an electrolyte product, focus on the mineral content, not the branding.

The packet format has taken off for a reason. They're convenient, portable, and easy to throw in a bag. But the market has filled up fast, and a lot of what's out there is riding the trend more than delivering real value.

The first thing to look at is the sodium content. A lot of popular packets are sitting at 200 milligrams or less per serving. That sounds like something, but if you've been sweating for an hour you've already lost two to five times that amount. It's not enough to move the needle.

The second thing is what they're using to make it taste good. Natural fruit flavors are fine. What you want to watch for is the combination of citric acid, malic acid, and artificial sweeteners like sucralose or acesulfame potassium. Citric acid and malic acid give that tart, refreshing taste that makes a product feel like it's doing something. They're not harmful in small amounts, but they're flavor tricks, not functional ingredients. Sucralose is one of the most common sweeteners in this category. It's calorie free and stable, which is why brands love it, but some people are sensitive to it and it offers nothing nutritional.

Then there's the sugar question. Some packets lean on cane sugar or glucose for quick energy during exercise, which can make sense in the right context. Others use stevia, which is a cleaner option. The issue is when a product has both a long sweetener list and minimal mineral content. At that point you're essentially buying flavored water with a wellness label on it.

The packets worth buying are the ones where the mineral content is the star, not the flavor. LMNT is a good example. High sodium, real potassium and magnesium numbers, no sugar, simple ingredient list. It doesn't taste like candy, but that's the point. Liquid IV has built a massive brand but leans heavily on sugar and the sodium content is on the lower end. It's not a bad product, but it's closer to a sports drink in a packet than a true electrolyte supplement. Ultima and Nuun sit somewhere in the middle, lighter on sodium but cleaner on ingredients.

Read the label before you buy. If sodium is under 500 milligrams and the ingredient list reads like a candy formula, keep looking.

The bottom line

Electrolytes aren't a magic fix. They're a missing piece that often goes unnoticed because the symptoms are subtle.You don't need to obsess over exact numbers every day. But having a rough sense of what your body needs and where it's coming from goes a long way.

Pay attention to how you feel. Cramping, fatigue, headaches, brain fog, and unusual cravings for salty food are all signals worth listening to. Sometimes it's sleep or stress. Sometimes it's as simple as needing more sodium or potassium.

Hydration is not just about how much you drink. It's about what's in that water and how your body uses it.

Get that right, and things tend to quietly improve across the board. Energy is more steady. Workouts feel better. Mood can shift.

It's one of those small adjustments that makes everything else work a little better.