Sulfur is the fifth most common element on Earth and is most commonly found in volcanic regions. For hundreds of years, through the end of 19th century, Italy was the main supplier. During the 20th century underground deposits were discovered in the US.
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This ingredient has antibacterial and keratolytic properties, is used on skin conditions including acne, psoriasis, eczema, and dermatitis and is often found in soap, shampoo and acne related skincare.