I have been taking this MSM on and off for quite some time now, but really don't know if it is helping me yet.
I have so very many allergies and intolerances that it is hard to know.
I do know that if I can tolerate it for long enough my asthma, chemical sensitivities and cough should improve.
David Wolfe writes in his book "Longevity Now " about the attributes and benefits of MSM and also advises that it be from pine trees which this is.
I will start again soon hopefully to take it once more and report back.