It seems to be everywhere at the moment, is it just another gimmic to spend money on? I'm early 40's with creaking knees (under physio but there doesn't seem to be a cause other than ageing), nails are ridged despite a healthy diet and taking appropriate vitamins and if it's a way of brightening and smoothing my skin I'm game but mainly interested in it for my joints.
I hear you need at least 3 months before seeing a difference so if anyone can concur and specify brands in case that makes a difference - bonus points if it's plant based!