Well, I think it's eco friendly. It's a naturally occurring element when mined directly from a quarry or it can be found as a by-product which is then sold off.
I've been thinking about trying to add some powder to a melt-and-pour soap base I found to use on face and hair. There is a variety of sulfur called 'sublimed' sulfur which has hardly any smell at all. I can't use salicylic acid on my skin and I've had great results with sulfur masks in the past(think: the Proactiv mask) so when I read about sulfur being a good ingredient to have in hair shampoos for growth and scalp help I thought I'd ask around here and see what everyone thinks or has heard/experienced.
Wiki quote: "elemental sulfur has been used mainly as part of creams to alleviate various conditions such as scabies , ringworm , psoriasis , eczema and acne . The mechanism of action is not known, although elemental sulfur does oxidize slowly to sulfurous acid, which in turn (through the action of sulfite ) acts as a mild reducing and antibacterial agent."