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."