Minstrel my 8.5 year old has been on Yumove + for about 3 months now and I have definitely noticed an improvement in his movement, and he is less stiff than he was beginning to get. I get it from Yumove themselves and because he also has their Yucalm for his stress and anxiety problems get a good price on his bi-monthly subscription. They are widely available on Amazon, Vetuk etc.