Your hair is primarily composed of sulfur and protein (keratin). Adding more sulfur to your body with supplements like Methylsulfonylmethane (MSM), is a healthy, safe way to increase hair growth.
MSM is organic sulfur, found naturally in every plant and animal cell and in all of your body's living tissues. MSM is a food, easily absorbed by your body. (Ref. 1.)
According to a study at Oregon Health Sciences University, all study participants experienced increased hair growth after six weeks while taking MSM. (Ref. 2.)
As sulfur, MSM stimulates your scalp's circulation, which nourishes your hair follicles. Sulfur is also called "the beauty mineral," because you need sulfur to keep hair beautiful and glossy. (Ref. 1.)
To increase your hair's strength, shine and growth, take MSM supplements daily with Vitamin C. There isn't an established RDA for MSM, since it's considered safe. But a common dosage is 1,000 to 3,000 mg daily, in capsules, tablets or powder. Drink extra water when taking MSM.
(See Reference 1)
Consider taking MSM if you're vegan or vegetarian, since your diet may result in a sulfur deficiency. (Ref. 1.)