Never heard that claim. Another possibility is that if you are using ascorbic acid, it has a very acid pH. IMO the GI tract does not like this much acidity. Buffered C is much better.

Definitely a possibility - whenever i've had lots coming out of me - be it from using MSM or just in general - its tended to cause digestive issues..

When I was taking 2 tablespoons a day (way too much) I felt incredible, very emotional too which was needed, because i've felt like a statue emotionally. A q-tip with some MSM and water in my nose inhaled cleared my sinuses that I didn't know were clogged to begin with, and it cleared a great deal of brain fog in a matter of minutes. I continued with 2 overflowing TBS dose for 5 days but had to stop because I do have leaky gut and constipation, this leaves them not much place to go. tmi (it's sever) Do not take (too much?) MSM if you have bad leaky gut, they will create other ways out that aren't there. FAIR WARNING. This stuff is Powerful. small doses are said to heal the gut and repel them, it's been a while now, I've stopped grains altogether and am giving small doses a try because it's a really great healing substance, but will be more gentle this time