- Sodium, potassium and magnesium keep muscles contracting, nerves firing and the heart beating regularly.
- Most Canadians eat too much sodium and too little potassium.
- Diuretics, stimulants like clenbuterol, and heavy sweating can push electrolytes into dangerous territory.
- Food covers most needs; electrolyte drinks help in long sessions or heat.
Electrolytes get attention mainly when someone cramps up mid-session, but they matter more than that, especially for lifters who diet hard, sweat heavily or use stimulants. This guide covers what each electrolyte does, how much you need, and when imbalances become dangerous.
The main electrolytes
| Electrolyte | Role | Good food sources |
|---|---|---|
| Sodium | Fluid balance, nerve signals, blood pressure | Salt; most comes from processed food |
| Potassium | Muscle contraction, heart rhythm, offsets sodium’s effect on blood pressure | Potatoes, beans, lentils, bananas, yogurt, leafy greens |
| Magnesium | Muscle relaxation, energy metabolism, sleep | Nuts, seeds, whole grains, beans, dark chocolate |
| Calcium | Muscle contraction, bone | Dairy, fortified plant milks, canned salmon |
How much Canadians need
- Sodium: Health Canada’s recommended upper limit is 2,300 mg a day; Canadians average more than that.
- Potassium: adequate intake is about 3,400 mg for men and 2,600 mg for women; most people fall short.
- Magnesium: about 400 to 420 mg for men and 310 to 320 mg for women.
Hard training and heavy sweating raise needs, especially for sodium.
Cramps
Muscle cramps during training are usually caused by fatigue more than electrolytes, but low sodium from heavy sweating, low magnesium and dehydration can contribute. Pumps and cramps on some steroids (often reported with Anavar and Anadrol, in the lower back and calves) are common and not fully explained. Staying hydrated, getting enough potassium and magnesium, and stretching the affected muscle usually help.
When electrolytes become dangerous
Diuretics
Diuretics drain sodium, potassium and magnesium. Low potassium in particular can cause muscle weakness and life-threatening heart rhythms. They’ve been linked to collapses and deaths in physique sport. See our contest prep safety guide.
Clenbuterol and stimulants
Beta-agonists like clenbuterol shift potassium into cells and can lower blood levels while pushing heart rate up. See our clenbuterol guide.
Drinking too much plain water
Drinking large amounts of plain water during long, sweaty sessions can dilute sodium (hyponatremia), causing headache, nausea and confusion. Add sodium in long sessions.
Seek urgent care for palpitations, an irregular heartbeat, severe weakness, confusion or fainting.
Practical tips
- Eat potassium-rich foods daily
- Keep sodium moderate and consistent rather than very low
- Use an electrolyte drink in sessions longer than about an hour, or in heat
- Ask for electrolytes on your bloodwork if you diet hard or use stimulants
Frequently asked questions
Do lifters need electrolyte supplements?
Most get enough from food. Electrolyte drinks help in long, sweaty sessions or heat.
What causes cramps on Anavar?
Cramps and pumps are commonly reported; hydration, potassium and magnesium often help, but the cause isn’t fully understood.
Is low potassium dangerous?
Yes. It can cause weakness and serious heart rhythm problems, especially with diuretics or stimulants.
How much sodium should I eat?
Health Canada recommends staying under 2,300 mg a day for most adults; heavy sweaters need more on training days.
This article is general information for adults in Canada, not medical advice. Talk to a doctor or pharmacist before using any prescription drug, anabolic steroid or research compound, and get bloodwork done. If you’re in crisis, call or text 9-8-8 (Suicide Crisis Helpline) any time.
