It's particularly effective when combined with other brightening ingredients like vitamin C and niacinamide, as found in this mask
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Kintz P (2018) Hair analysis in forensic toxicology: an updated review with a special focus on pitfalls
Clinical Pediatrics
18,19 Although heavy metal toxicities due to lead, mercury, and cadmium are generally considered rare in mainstream medicine, less well-recognized is that chronic accumulation that may not achieve classical acute toxicity thresholds may nevertheless contribute to adverse health effects