MSM and sulfa alergy interaction?

When I was a child I was put on sulfa meds that almost killed me, and the doc said if I tried sulfa products again it would probably stop my heart. I do have some chemistry background so I realize there are pretty significant differences between sulf-a, sulf-ite, sulf-ur, ect.; and I have taken MgSO4 (Magnesium sulfate) to suppliment Mg into my diet with no problems. So how do the EXPERTS feel about someone who has a supposid sulfa allergy taking MSM?

Thanks in advance Tweet