Keto Electrolytes: Sodium, Potassium and Magnesium Explained
Most "keto supplements" are unnecessary. Getting these three minerals right is the exception.
Short answer: Not always. Salting food, drinking broth and eating avocado, greens and seeds covers many people. Supplements help when symptoms persist.
Why keto changes your electrolyte needs
Lower insulin makes the kidneys release more sodium, and water follows. At the same time, keto removes salty processed foods, bread and many potassium-rich starchy foods. The net effect is that some people end up short — which shows up as headaches, cramps and fatigue.
Sodium
Most people on keto do better salting food generously and drinking salted broth during the first weeks. People with high blood pressure, heart failure or kidney disease should not raise sodium without medical advice.
Potassium
Adults need several grams of potassium a day from food. Keto-friendly sources per typical serving:
| Food | Serving | Why it helps |
|---|---|---|
| Avocado | Half (75 g) | One of the densest keto sources |
| Spinach (cooked) | Half a cup | High, but also high in oxalate |
| Salmon | One fillet | Protein plus potassium |
| Mushrooms | One cup | Low carb, decent potassium |
Potassium supplements are a different matter: high-dose potassium can be dangerous with kidney disease or some blood pressure drugs, so get advice before using them.
Magnesium
Magnesium supports muscle and nerve function and is commonly low in modern diets. Good keto sources include pumpkin seeds, almonds, leafy greens and dark chocolate. Supplements in citrate or glycinate form are well tolerated; high doses can cause diarrhoea.
Homemade electrolyte drink
- 500 ml water
- A quarter teaspoon of salt (about 575 mg sodium)
- A quarter teaspoon of potassium-based "lite" salt, if you have no kidney or medication contraindications
- Juice of half a lemon
- Sweetener to taste
Sip through the day rather than drinking all at once.
Frequently asked questions
Do I need electrolyte supplements on keto?
Not always. Salting food, drinking broth and eating avocado, greens and seeds covers many people. Supplements help when symptoms persist.
What are the signs of low electrolytes on keto?
Headaches, muscle cramps, fatigue, dizziness on standing and heart palpitations. Palpitations or fainting need medical attention.
This guide is general information for healthy adults, not medical advice. See our medical disclaimer.