Guides

Vitamin B12 tablets with eggs, milk and cheese on a kitchen table

Vitamin B12: who may lack it, which form to cho...

Vitamin B12 comes mainly from animal foods, so vegans, older people and people on metformin or acid-reducing medicines should talk to a doctor. If you choose a supplement, compare the...

Vitamin B12: who may lack it, which form to cho...

Vitamin B12 comes mainly from animal foods, so vegans, older people and people on metformin or acid-reducing medicines should talk to a doctor. If you choose a supplement, compare the...

A glass of water and one tablet on a nightstand at dusk

Is melatonin safe? Dose, timing, children and w...

Melatonin is a hormone your body makes at night, also sold as a food supplement. The EU sleep-onset claim needs exactly 1 mg close to bedtime, and melatonin is not...

Is melatonin safe? Dose, timing, children and w...

Melatonin is a hormone your body makes at night, also sold as a food supplement. The EU sleep-onset claim needs exactly 1 mg close to bedtime, and melatonin is not...

Pumpkin seeds, almonds, dark chocolate, spinach and magnesium capsules

Magnesium deficiency: how it is diagnosed and w...

Only a doctor can confirm magnesium deficiency, usually with a serum magnesium blood test. Tiredness or cramps alone cannot tell you the cause. You can check your food sources and...

Magnesium deficiency: how it is diagnosed and w...

Only a doctor can confirm magnesium deficiency, usually with a serum magnesium blood test. Tiredness or cramps alone cannot tell you the cause. You can check your food sources and...

Vitamin D softgels, tablets and drops in winter sunlight

Best vitamin D supplement: D3, dose, format and...

The best vitamin D is D3 in a dose that fits your blood test, with all sources under 100 µg (4000 IU) a day, in a format you take daily....

Best vitamin D supplement: D3, dose, format and...

The best vitamin D is D3 in a dose that fits your blood test, with all sources under 100 µg (4000 IU) a day, in a format you take daily....

Bananas, avocado, white beans, dried apricots and tablets

Potassium deficiency: how much you need, where ...

Adults need about 2000 mg of potassium a day by the EU label norm, and EFSA sets the adequate intake at 3500 mg, mostly from food. Supplements hold small amounts...

Potassium deficiency: how much you need, where ...

Adults need about 2000 mg of potassium a day by the EU label norm, and EFSA sets the adequate intake at 3500 mg, mostly from food. Supplements hold small amounts...

Iron capsules next to lentils, spinach and pumpkin seeds

Ferritin and iron deficiency: what the blood te...

Ferritin is the protein that stores iron, and a blood test reads it as a marker of iron stores. Only a doctor can say whether your result means iron deficiency,...

Ferritin and iron deficiency: what the blood te...

Ferritin is the protein that stores iron, and a blood test reads it as a marker of iron stores. Only a doctor can say whether your result means iron deficiency,...