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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, sulfur products may cause the skin to become dry.
There isn't enough reliable information available to know if taking sulfur by mouth as medicine is safe. Sulfur might cause diarrhea when taken by mouth.
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 nightly for up to 6 nights.
Children: Sulfur is POSSIBLY SAFE when applied to the skin appropriately, short-term. Products containing sulfur in concentrations up to 6% have been used safely when applied nightly in children and adolescents for up to 6 nights. Products containing sulfur in concentrations up to 2% have been used safely when applied for 3 hours daily for up to 6 days in infants.
Sulfa allergy: It is commonly thought that people who are allergic to sulfa drugs might be allergic to sulfur containing products. This is not true. People with an allergy to "sulfa" react to the sulfonamide in some antibiotics and related drugs. They do not react to elemental sulfur. *