is it safe to use for someone with allergies

I have been using MSM for awhile with great results (energy, balance etc.).

I presented it to my Mom, but she said she has an allergy to sulfur products... and thought not to take it. From research I could offer her no advice to whether or not that was a problem with MSM.

She is also on perscription drugs for menopause, high cholestral, and high blood pressure. I have been slowly introducing her to more alternative approaches.

Any advice would be great.

thanks,
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