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Why does hydroquinone cause rebound hyperpigmentation when you stop using it? Hydroquinone destroys tyrosinase irreversibly by denaturing the enzymes copper active site, which triggers melanocytes to upregulate MITF (microphthalmia-associated transcription factor) the master regulator of melanocyte activity as a compensatory response

Antioxidant Support Known as the master antioxidant, glutathione neutralizes free radicals and reduces oxidative stressmajor drivers of aging and age-related disease

PMID: 22537212 | DOI: 10.1111/j.1753-4887.2012.00476.x [21] Machowetz A, Poulsen HE, Gruendel S, et al

Coupled to these oxidation-reduction steps is a transport process in which protons (H + ) from the mitochondrial matrix are translocated to the space between the inner and outer mitochondrial membranes

They'll most likely want to do routine bloodwork to check your B12 levels