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Sulphur and the bodyWhen applied to the skin: Sulfur is POSSIBLY SAFE when applied to the skin appropriately, short-term. Products containing sulfur in concentrations up to 10% have been used safely for up to 8 weeks. In some people, applying sulfur products to the skin may cause the skin to become dry.
Special Precautions & Warnings:
Pregnancy and breast-feeding: Sulfur is POSSIBLY SAFE when applied to the skin appropriately, short-term. Products containing sulfur in concentrations up to 6% have been applied safely every night for up to 6 nights. There isn't enough reliable information to know if sulfur is safe to take by mouth when pregnant or breast-feeding. Stay on the safe side and don't take it by mouth.