Electrolytes for Hikers: What They Are and When They Actually Help

This is the first in a series of hike hacks I want to share, and it covers something I have used and tested for years: electrolytes. There are many reasons people take supplements, but here I want to focus specifically on electrolytes and minerals, and on when they genuinely make a difference for demanding sport in hot conditions.

I always carry electrolytes on the Camino in tablet form and drop them into my water bottles. Read on and decide for yourself whether they belong in your pack too.

What are electrolytes?

Before you jump on the trend, here is the scientific explanation.

Electrolytes are chemical compounds, primarily salts, that form positively or negatively charged ions when dissolved in water. These ions are essential for many biochemical processes in the body. They are involved in transmitting electrical impulses in nerve and muscle cells and in maintaining fluid and pH balance.

The most common electrolytes in the body include sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+), chloride (Cl-), phosphate (HPO42-) and bicarbonate (HCO3-). They are found in different concentrations in body fluids such as blood, sweat and urine and inside your cells, and they play a decisive role in healthy body function: nerve and muscle function, fluid balance, acid-base balance and much more.

In plain hiker terms: when you sweat for hours, you lose more than water. You lose the salts that make your muscles and nerves work properly. Electrolyte tablets and drinks put those salts back.

There are three reasons I keep taking them on every long-distance walk.

1. Fluid balance and avoiding cramps

It is far from only on hikes that I use electrolytes. I have grown so fond of them that I take them before football matches, marathons, ultra runs and long rides on the bike.

The basic reason is cramping. Like a lot of people, I get cramps when I push hard in the heat, especially during long-distance efforts. I have lain in my bunk at an albergue on the Camino Francés in the evening and felt my legs seize up after nothing more dramatic than a long day of walking. Almost every pilgrim I have shared a dorm with knows that exact sensation.

Part of the cause is a poor fluid balance because the body is short on electrolytes. So on the extra hard days I take them before, during and after the stage, keeping both my fluid balance and my salt balance topped up. Since I started doing that consistently, evening cramps have become rare for me.

2. Vitamins and minerals in the same bottle

Electrolytes come as powders, as tablets and as ready-made sports drinks. I honestly like all three formats. It can look like one big marketing stunt, and I understand the scepticism, but my experience is that they have had a real effect on how I feel on hard days.

Many mixes also have vitamins and minerals added, and most are low in calories. That makes them a genuinely good alternative to sugary drinks when you need to get a lot of fluid down anyway. I consider it a small hike hack: the same litre of water you were going to drink now carries salts, minerals and vitamins along with it.

3. They make the water taste better

The last reason is the simplest one: taste. When you walk the Camino you are active all day, often in serious heat, and that means drinking a lot of water. There are plenty of places to refill your bottle along the way, but the tap water does not always taste like it does at home. I drink tap water everywhere in Spain without any worries, and to make it more pleasant I drop an electrolyte tablet in the bottle. It tastes better, and it delivers the benefits from points one and two at the same time.

When water tastes good, you drink more of it. On a hot 30 km stage, that alone can be the difference between finishing strong and limping in dehydrated.

Why you should NOT take electrolytes

Now for the honest counterpoint. If you eat a varied diet and your fluid and salt balance is fine, there may be no good reason to take electrolytes at all.

I have just listed three reasons I love them, but they are absolutely not a requirement for performing at your best, whether you are doing sport or heading out on a long walk. Your body gets electrolytes from ordinary food, and for a moderate day of walking in mild weather, food and water cover you completely.

So if you never cramp, have no trouble drinking enough, and prefer the taste of plain water or something else entirely, you may well be one of the people who should skip them. They solve a specific problem: heavy, prolonged sweating. If you do not have that problem, there is nothing to fix.

Where to find electrolytes on the trail

The good news is that you do not need to carry a full supply from home. If you are walking the Camino, you can find electrolytes in supermarkets and pharmacies along the way, and the small cafés and bars stock sports drinks such as Aquarius that contain electrolytes. Aquarius in particular is everywhere in Spain and has fueled many a pilgrim through the afternoon heat.

Tablets are my preferred format for the pack because a tube weighs almost nothing and turns any water source into a sports drink. Look for tablets that list sodium, potassium and magnesium on the label, since those are the ones that matter most for sweating athletes. Powders work just as well but are bulkier and messier to dose on the move.

If you are putting together your full Camino kit, electrolyte tablets sit high on my packing list alongside the other small items that punch far above their weight. You can find the rest of my recommendations in my gear guides.

Do you have your own experience with electrolytes, good or bad, or do you think the whole thing is nonsense? Either way, I would love to hear about it.