It's been a struggle trying to get one that works like the Sundown brand did, that was discontinued maybe long ago. I ordered it 2 different times and both orders were cancled, because they didn't have it, and a Sundown Only site sent me a different brand, and with a 50% restocking fee and shipping it back, I would have been out 24$, and had nothing. I kept searching, even starting to buy some of the extras listed in the Sundown brand, and found a Source Naturals brand that has some things others didn't, and so far it is looking interesting. Hasn't made me need to lift, but 10min after taking it and the Sundown MSM, that together got me lifting heavy, and feeling I didn't do a thing. I stretched Real hard, and did some isometric exercises, and my muscles feel different, like stronger. I keep wanting to stretch Hard.
I added another brand of MSM that I think I didn't realize might have been involved, but had been taking before the Sundown brand of MSM, when adding MSM to glucosamine, trying to cure a knee pain problem.
Will see how it goes..