Read some of the reviews on this link then apply that to just about any other product as all the distilled MSM in the country is manufactured by just one company.
Stay away from imported or anything with added ingredients, anti-caking agents etc.
The reason sulfur gives you energy is that it transports more oxygen into the cells from the water you drink and binds toxins to carry them out. That is the immediate effect. Long term it helps build new cells with more permeable cell walls for better function anywhere in the body.
From the cellular matrix study:
Some of the many benefits of organic sulfur crystals include:
-Increasing enzyme production within bodily glands and improving resistance to illness
-Increasing flexibility in muscle tissue
-Increasing blood circulation
-Reducing muscle inflammation and promoting muscle healing
-Promoting the healthy growth of hair and fingernails
-Discouraging the growth of cancer cells through oxygenation
-Reversing osteoporosis, Alzheimer's disease and Parkinson's disease
-Promoting healthy skin production and reducing wrinkles
-Regulating insulin production
-Improving colon function and eliminating colonic parasites