I don't know what it is, but my body likes to break down this double bonded l-cysteine (which is known as l-cystine) rather than taking l-cysteine (or the acetyl supplement version, NAC). I have tried NAC, l-cysteine HCL, and plain l-cysteine. This is the best (l-cysteine HCL comes in second place, then plain l-cysteine and then NAC last).<br /><br />Maybe your body is different, but if you're wondering what the heck this stuff is, it's definitely twice as good as l-cysteine (literally). Major joint fortification, metal awareness, allergy relief, you name it (all of the benefits you hear about NAC and more).<br /><br />Best of all, THERE IS NO SMELL! But when you're body breaks it down, that's another story!<br /><br />I am going to be a Bulk Supplement customer forever! Hats off to them for the quantity AND QUALITY of their products!

L- Cysteine helps re-grow hair on top of your head. I have male pattern baldness and use this 2 times, day along with other amino acids to help re-grow some hair. I have some re-growth on top of my head, but I have a long way to go.

No foul odor or taste, for the most part. But it doesn't fully dissolve, I'm guessing particle size varies widely, and the bits that don't dissolve are crunchy.

I think this is a great product for the price. I totally meant to buy l-cysteine and bought l-cystine instead, and that is my fault. Im bummed. The only thing I'm not impressed with is that their products do not come with a dosing spoon. I would have given 5 stars otherwise.

Seems to be helping... the only thing is that I've read that this works best in the body when taking Vitamin B supplements and I've never liked the smell of those, but I'm taking that now to help the process.

I got this while looking doe another supplement, it turned out to be one I didn't already know about.