Welcome to steem @murray64 ! Two things for you to try. First and most importantly Nicotinamide Riboside ( Niagen). It may be hard to get In Australia but do yourself a favor and get it. Start by taking 1g per day for at least a week then scale back to 500mg to 250mg . Secondly you might also find the probiotic L. Reuteri helpful. High doses of omega3 has helped some people with arthritis as well.