research Elemental Distribution in Medicinal Plants Commonly Used in Folklore Medicine in Mexico 8 citations, February 1997 in “International journal of environmental analytical chemistry” Most medicinal plants in Mexican folklore have safe element levels, but arsenic exceeds safe limits in almost all.
research Effects of Keratin Pretreatment on Damaged Hair During Perm Procedure March 2023 in “Asian journal of beauty & cosmetology” Keratin pretreatment improves the quality of damaged hair during perming.