Too little — or too much — of a single vitamin or mineral can change how you feel. These guides explain what each one does, the signs of a deficiency, and how to read your levels the way a doctor does.
Your calcium levels do far more than build strong bones — calcium also keeps your heart, muscles, and nerves working, which is why your body guards its blood level so carefully. A calcium blood test is a common part of routine check-ups, and this guide explains what your result means, what high and low levels…
Folate deficiency is one of the most common vitamin shortfalls in the world, and because its early signs are so vague — tiredness, low mood, a sore tongue — it often goes unnoticed for months. Folate (vitamin B9) is essential for building healthy red blood cells and DNA, so when your levels drop, your whole…
Zinc deficiency is easy to overlook, yet this small trace mineral runs an enormous number of jobs — from defending you against infections to healing wounds and keeping your sense of taste sharp. Because your body has no large store of zinc, a shortfall can build quietly and show up in surprisingly varied ways. This…
Your potassium levels rarely make headlines, but few numbers on a blood test matter more for your heart. Potassium is an electrolyte — a mineral that carries an electrical charge — and your body keeps it within a remarkably narrow range, because both too little and too much can disturb your heartbeat. This guide explains…
Magnesium is one of the hardest-working minerals in your body, involved in hundreds of processes — yet a deficiency is common and surprisingly easy to miss. It can show up as muscle cramps, poor sleep, fatigue, or anxiety, and a routine blood test doesn’t always catch it. So what are the signs of magnesium deficiency,…
Vitamin B12 deficiency is surprisingly common — and surprisingly easy to miss. Its symptoms creep in slowly and look like everyday tiredness, yet left untreated it can cause lasting nerve damage. So how do you know if you’re low, what’s a normal B12 level, and what should you do about it? Let’s decode it. What…
Vitamin D — the “sunshine vitamin” — is one of the most common deficiencies in the world, affecting an estimated one billion people. Yet its symptoms are so vague that most people never connect the dots. So how do you know if you’re low, what is an optimal vitamin D level, and how can you…