Quick introduction
MSM (Methylsulfonylmethane) is an organic sulfur compound found naturally in plants and animals, including humans. It is a mogger compound to reduce oxidative stress, apart from that it can take your skin lighthening game to the next level.
Mechanism of Action
MSM influences melanocytes and supports glutathione production indirectly via the transsulfuration pathway.
Dosage
You should take around 1-3g a day.
Any more than that will just result in you taking a ton of shits a day.
Sourcing
I would always recommend to get the powder form instead of the capsule form, as the latter is a lot cheaper in most cases.
You can source MSM anywhere, be it your local store or on amazon.