6 Electrolytes and Why They're Important

Medically Reviewed by Dr. Bryan Seigel D.C., P.L.C.

The six electrolyte minerals are sodium, potassium, magnesium, calcium, chloride, and phosphate. Each carries an electrical charge that your cells use to fire nerves, contract muscles, and hold fluid in balance. You lose all six every day — through sweat, urine, and ordinary metabolism — and running low on any one of them is enough to leave you cramping, headachy, and foggy.

Here’s what each one does, and what it feels like when you don’t have enough.

Electrolyte	What it does	Signs you may be low	Food sources	In Electrolyte Recovery Plus
Sodium	Fluid balance, nerve conduction, muscle contraction, thirst signalling	Fatigue, brain fog, headache, muscle cramps	Salt, olives, pickles, broth	✓
Potassium	Works opposite sodium in the sodium-potassium pump; muscle and nerve signalling	Muscle weakness, cramps, fatigue, irregular heartbeat	Avocado, leafy greens, potatoes, salmon	✓
Magnesium	Cofactor in over 300 enzyme reactions; muscle relaxation, sleep, bone formation	Muscle cramps and twitches, poor sleep, headaches, irritability	Pumpkin seeds, almonds, spinach, dark chocolate	✓
Calcium	Signals muscles to contract; blood clotting, heart rhythm, bone and teeth structure	Cramping or spasms, numbness or tingling in fingers, brittle nails	Dairy, sardines, kale, fortified plant milks	✓
Chloride	Most abundant negatively charged ion; digestion, pH balance, oxygen and CO2 exchange	Usually tracks sodium loss — fatigue, weakness, dehydration	Salt, seaweed, tomatoes, celery	✓
Phosphate	Pairs with calcium for bone and teeth; cellular energy (ATP), cell membranes, DNA	Fatigue, muscle weakness, bone discomfort	Meat, fish, eggs, nuts, dairy	✓

Why some lists say three, and others say seven

Look this up in a few places and you’ll get different numbers. Three. Four. Five. Six. Sometimes seven. They’re not contradicting each other — they’re drawing the line in different places, and it’s worth knowing where.

• Three or four is the sweat shortlist: sodium, potassium, magnesium, and often calcium. These are the ones you lose fastest through exercise and heat, which is why most sports drinks stop here.
• Six is the standard physiological set — the four above plus chloride and phosphate. That’s the list on this page, and it’s the one used in clinical contexts.
• Seven adds bicarbonate. It’s a genuine electrolyte and it does real work buffering your blood pH, but your body produces it rather than pulling it from food, so it doesn’t belong on a list of things to consume.

The practical version: sodium, potassium and magnesium are the three you’re most likely to run short of. Calcium, chloride and phosphate matter just as much but are easier to get from a normal diet. Bicarbonate looks after itself.

Where the count actually matters is when you’re comparing supplements. Plenty of popular mixes give you two or three of the six and stop there. Here’s why six beats four if you want the longer version.

What are electrolytes?

The electrolyte minerals are the smallest signaling molecules in the body. They travel through channels in cell membranes to trigger processes that are necessary for us to stay alive. Using these channels, electrolytes shuttle nutrients into cells, and carry wastes out of them. Electrolyte minerals travel through the space between nerve cells and muscle cells to trigger contraction or relaxation, and maintain fluid balance inside and outside of the cell.

Electrolyte levels are kept in balance by a complex hormone cascade, and this is largely regulated in the kidneys and adrenal glands. These same hormones are also responsible for the signal of being thirsty. If you feel thirsty, you’re also probably low in electrolytes! While the body must keep electrolytes in a very narrow range for you to feel your best, it can only work with what it’s got, and lots of normal daily activities use up these essential minerals. Sitting at a desk requires electrolytes to breathe, pump the heart, and tap keys on a keyboard. Getting a good workout in uses even more electrolytes since not only are the muscles and nerves cycling through them but they’re lost in sweat, too. This is why it’s so important to replenish your electrolytes every day.

Why are electrolytes important?

Electrolyte imbalances rarely announce themselves. It’s uncommon for someone to visit a doctor for low electrolytes, and it’s usually only treated as a medical condition when someone has a health crisis under extreme conditions. Day to day, it’s easy to write off a day where you just don’t feel your best.

Instead, electrolyte imbalances tend to make you feel not like yourself, like you don’t want to get up and walk, and like your head is filled with rocks. Cramps are common when electrolytes are low, as are headaches, and a general feeling of malaise and lethargy. So you see, low electrolytes might not lead to a hospital trip, but they can dramatically decrease your quality of life.

Electrolyte minerals are important in maintaining hydration, too. When there aren’t enough electrolytes circulating, water gets pulled from the bloodstream to maintain solute balance. Less water in the blood means less water reaching cells, and nutrients and wastes can’t be transported effectively. When you lose electrolytes, you also lose water, and this is why drinking plain water just isn’t good enough.

The 6 electrolyte minerals in detail

1. Sodium

This is the most abundant positively charged ion in the body, and it’s needed in larger amounts than the other minerals because it’s used so heavily. Sodium is needed for nerve conduction and muscle contraction, including maintaining heart rhythm. It helps to regulate body temperature and level of thirst, as well as energy production in the form of ATP in cells.

2. Calcium

It’s true that calcium is needed for strong bones and teeth, but that’s not all! Calcium is necessary for metabolic function, blood clotting, heart rhythm regulation, and as a cofactor for many enzymes. While the majority of the calcium circulating in the blood and other fluids is electrically charged, the calcium that makes up bones and teeth is not.

3. Potassium

This ion is found in greater concentrations inside of cells, as opposed to extracellular fluid like blood. It functions opposite of sodium in many ways and is paired to it in the Sodium-Potassium Pump in cell membranes, which drives many cellular functions.

4. Chloride

This mineral is often bound to sodium in the form of table salt. Since sodium is the most abundant positively charged ion in the body, it makes sense that chloride is the most abundant negative one. Chloride supports good digestion, body-wide fluid pH balance, and optimal exchange of oxygen and carbon dioxide.

5. Phosphate

This electrolyte mineral seems to be the most forgettable, and yet it’s just as essential as the rest. It pairs with calcium to build bones and teeth, and is essential in cellular energy production. Phosphate is often bound to oxygen; when it isn’t bound it’s just phosphorus. Phosphate is an integral part of cell membranes and our DNA.

6. Magnesium

While magnesium is needed for the same reasons as the other electrolytes, such as nerve firing and muscle function, it’s also used by over 300 enzyme reactions! It’s necessary for strong bone formation and healthy sleep cycles. Muscle fibers need magnesium to slide together when they contract and relax. Being under stress depletes this mineral so if you’re having a rough week you may need extra.

How to get enough electrolytes

Processed foods have virtually no usable electrolyte minerals in them, so this is another reason it’s smart to avoid processed foods. In addition, many frozen foods and restaurant meals are high in sodium, even if they don’t taste salty, which can throw off your electrolyte balance. Alcohol can also deplete electrolytes, so indulge infrequently.

Choose fresh foods as often as possible, like green leafy vegetables and low-sugar fruits. Fresh whole foods aren’t enough though, since many foods, even organic options, are grown in mineral-depleted soil. It’s virtually impossible to get enough electrolytes from food alone in the modern world even though fresh foods are the most nutrient-dense.

Your best bet is to supplement with a well-formulated electrolyte drink. When choosing an electrolyte mix, use this checklist:

• All six electrolytes — sodium, potassium, magnesium, calcium, chloride and phosphate. Many popular mixes only include two or three.
• No added sugar — some leading brands carry 11g or more per serving.
• A supporting blend of vitamins and minerals, not just the electrolytes alone.
• No artificial colors, sweeteners, or additives — look for a natural, non-sugar sweetener such as stevia.

Wrap-up

Why are electrolytes important? Because every cell in your body uses them. From simple tasks like typing at a keyboard to complex movements like burpees, and every vital process in between, electrolyte minerals provide the charge for daily living. We get signs when our electrolytes are low, like headaches and a lack of energy, but this is easy enough to fix. Focus on whole foods, especially fresh vegetables, and drink at least one electrolyte drink every day to feel your best.

Get all 6 electrolytes — Shop now

References:

Shrimanker I, Bhattarai S. Electrolytes. 2020 Sep 12. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan–. PMID: 31082167. (https://pubmed.ncbi.nlm.nih.gov/31082167/)