Ingested. The second link you supplied. Heard from people I play with that they take it for long time and they think it 'helps a lot' with pain in knees, elbows etc...
Note that I provided the links so that you could see WebMD's take on the
Effectiveness of GS vs MSM. This is listed under the
USES tab for each.
It is
possible that the use of a MSM supplement might be enhanced by also using DMSO topically at the desired joint. Alternately, topical MSM might be viable if used with Emu Oil or if used in a Liposome lotion. Other topical MSM products might not be very effective at all.
Warning: It is
possible that
mega-dosing with MSM might be detrimental to the liver or spleen. I suggest a bit of research on
MSM and
liver (or
spleen)
toxicity.