From vitamins C and D to calcium and magnesium, it’s critical to know whether you’re taking the correct dosage to avoid health problems

There are more than 100,000 supplements on the US market – capsules, powders, tablets and gummies sold to improve or maintain health. Supplements can contain vitamins, minerals, botanicals and amino acids on their own or in various combinations.

The consumption of these products is surging. But it’s a common misunderstanding that these products are entirely safe, says Dr Pieter Cohen, an internist and associate professor at Harvard Medical School. Excessive amounts of nutrients can cause health problems, so it’s critical to know whether you’re using the correct dosage of high-quality products.

Water bottles are the ‘perfect environment for bacteria to grow’ – as we’ve seen from the horror pics on social media. Follow these steps to stay clean

Environmentally friendly and convenient, reusable water bottles are on the rise. But on social media, people seem confused about how to clean them, and post horrifying pictures of mold growing inside.

Water sourced from a municipal water supply is likely very clean, explains Kelly Reynolds at the University of Arizona, who studies water quality and disease transmission.