They can, yes even something as ordinary as a vitamin or herb. It depends on what it is, how much you take, and for how long. Stick to the recommended serving, and if you’re on medication or managing a health condition, it’s worth checking with a doctor first.

Start with what your body actually needs, not whatever’s trending. Look at your diet, your lifestyle, your goals and if you’re unsure, a doctor or dietitian can help. Even just reading the ingredient list and dosage carefully makes a real difference.

Not always. A good, varied diet already covers a lot of ground. Supplements make more sense when there’s a specific gap to fill; they're not something everyone automatically needs.

You can, but don’t assume it’s automatically fine. Ingredients often overlap more than people realise, and some combinations can interact with medication. When you’re not sure, it’s worth asking someone qualified.

Don’t just go by what’s on the front of the pack. Check the ingredient list, how much you’re actually getting per serving, and who’s making it. And if something promises fast, dramatic results that’s usually a sign to slow down, not speed up.

There’s really no fixed timeline. It depends on the ingredient, where you’re starting from, the dose, and how consistent you are. Some things take weeks to show up; others work quietly, without you ever really “feeling” them.

Depends on what it is. Something like magnesium is often taken at night to help you wind down, while other supplements work better with food. It’s best to just follow what’s on the label for that specific product.