Every year, Australians spend hundreds of millions on sleep aids such as weighted blankets, wearables, magnesium sprays, sleep-optimising mattress toppers and blue-light glasses. Some of these genuinely help people, and there's nothing wrong with that. But buried beneath all the spending is a set of habits with the strongest scientific backing and they're completely free.

A small subset of supplements have genuine clinical evidence behind them. Not marketing claims, but randomised controlled trials and meta-analyses (studies that combine data from multiple trials to draw stronger overall conclusions). Here are five that have earned their place.

When it comes to our health, so much of what is happening inside our bodies goes unnoticed - until it doesn't. Fatty liver disease is a perfect example of this, most patients have no idea they have it until a blood test or scan picks it up incidentally. The good news? It is also one of the most responsive conditions to the right diet and lifestyle changes.

Cholesterol blood tests are a very common part of routine medical check-ups. Most people understand that we are aiming avoid high cholesterol to reduce our risk of atherosclerosis and heart disease. It is also recognised that heart disease and heart attacks are the number one killer in the developed world. Hence, cholesterol gets a lot of attention and rightly so!

When it comes to our body, we are often unaware of what is actually going on internally and how we are producing energy to go about our daily lives. To understand more we should start with blood glucose. Why? Because I believe it gives us the biggest bang for our buck!