"The common denominator that underlies all modern theories of biological ageing is change in molecular structure and, hence, function." – Leonard Hayflick, Professor of Anatomy at the University of California, San Francisco, and researcher on ageing.

Research continues to try and determine the intricacies of the ageing process and what causes its acceleration. But whatever the reason, it's more of a synergistic process than just coming down to one thing.

There are several converging causes including free radical damage, gene expression and DNA changes; inflammation and mitochondrial function decline. Loss of Nrf2, which helps to upregulate our cells' antioxidant defence system, is also a contributor as well as reduced telomere length.

So it may be interesting to know that within the hundreds of studies looking into the benefits of molecular hydrogen (H2), it appears to have a positive effect on... all of these.