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The EU's Scientific Committee on Consumer Safety (SCCS) said the mouse findings might point to a concern but they're hard to apply to humans since hairless mouse skin and human skin behave differently

Adequate levels of both iodine and selenium are required for optimal thyroid hormone metabolism

Some practitioners include copper peptides as part of broader alopecia areata protocols, combining them with treatments that modulate immune function

Prebiotic fiber supplementation in PD cohorts has resulted in enhanced bowel motility, lower gut inflammatory indicators, and beneficial alterations in microbial metabolites, while improvements in motor outcomes appear to be reliant on disease stage and intervention length [175]

doi:10.1007/s12272-013-0110-x