I just received a response from LEF via email and here is what they said ...
The starting material for the N-acetyl-L-cysteine is L-Cysteine HCl Monohydrate. The L-Cysteine HCl Monohydrate is derived from human hair.
So, I guess it is likely that most NAC supplements are indeed derived from human hair. It's probably a safe bet that most NAC supplements in a given price range are derived from human hair, with more expensive ones (like around 3 times more expensive) might be synthetic Lab made. Of course you would have to contact the manufacturer to be sure. I tend to think this is something most people do not know about since there does not seem to be much information online about it. This also makes me wonder how many other things there are like this out there we may be ingesting.
I realize it's not like you are actually ingesting the hair, but the thought of human hair in a vat with NAC being chemically extracted and then ingesting the NAC, is still repulsive to me, it probably would be to most people which is likely why it's not advertised. There are also the concerns like hair dye, etc., raised in my first post.
Anyone know of any verified Lab manufactured synthetic NAC (non hair or animal derived) and prices ?
I have been using 56 grams of whey powder "designer whey" ( 36 grams protein content) everyday for awhile now. Does anyone know how this compares to around 600 MG of NAC as far as increasing Glutathione production goes ?
I also wonder how around 1 gram of Methylsulfonylmethane (MSM) might compare as far as raising Glutathione. Are there any other options that are comparable with NAC ?