MSM - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509882/
MSM - https://www.naturalmedicinejournal.com/journal/beneficial-effects-sulfur-containing-supplement-hair-and-nail-condition
Zinc: https://pubmed.ncbi.nlm.nih.gov/17618180/
Zinc: https://anndermatol.org/Synapse/Data/PDFData/0140AD/ad-21-142.pdf
Zinc: https://pubmed.ncbi.nlm.nih.gov/22741940/
Biotin - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4171924/
Biotin - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4989391/
Biotin - https://www.essentialnutrition.com.br/media/artigos/collagen/Biotina-Familial-Uncombable-Hair-Syndrome-Ultrastructural-Hair-Study-and-Response-to-Biotin.pdf
Silica aka Silicon
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4938278/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3546016/
https://pubmed.ncbi.nlm.nih.gov/11344694/
DISCOUNT CODE REVEALS INSTANTLY!