I came across this product by chance. Had recurring knee and leg issues for sometime. I was willing to try anything new. I was told I would feel the impact from Solgar 7 in about 14 days. For me, the impact was immediate. I have gone from trouble walking, to excercycling 20ks a day, I have also felt the benefit in not having restless leg syndrome and am having a much better nights sleep. Sargol 7 will be used by me for the forseeable future. I have recommended this product to many people. Love it.