We buy all of our supplements from swansonvitamins.. and I herb.. they have good products and reasonable prices.. I believe that you only have to look for whether it has fillers in it.. remember to start slow.. and do not expect a miracle over nite... your body will decide whether your eye floaters are the most important place to use the msm first... you could have other situations in your body that to your body KNOWS are more vital for the msm to be used on first. and also be aware that it detoxes the liver of all the chemicals you have stored there from medications.. food chemicals.. air pollution.. ect... that the body has not been able to rid itself of...and are not needed in your body to use.. they are just stuck there like the old trash !! AND when you take MSM it is released into your blood stream.. many people who start taking msm complain of getting sick.. this is because you have just taken a garbage truck and dumped the garbage into your blood stream. yukko !!! ... and you may feel the results of all that hitting your blood stream.. so start slow !! build up on the amount you feel you need..
We Only realized the importance of MSM 2 years ago... I am now taking ... 15,ooo mg... but I have had lots of scaring from operations.. so my floaters have just now left... and I have been on MSM for a year.. Hair, nails and skin look great tho'... my husband found out that he cannot take as much as me... he gets a sore in his mouth when he takes to much... when he backs off with in a couple of days it is gone.. kinda like he has burned the inside of his cheek... you will have to find YOUR own limit.