It is believed to inhibit the enzyme tyrosinase, which plays a key role in melanin production
This is especially true when the headache complaints are not accompanied by the typical features of migraine such as nausea, light/sound sensitivity, and exacerbation upon physical activity (Cutrer 2012)
PubMed Cox, H.D., Smeal, S.J., Hughes, C.M., Cox, J.E., & Eichner, D
Lu SC: Regulation of hepatic glutathione synthesis: current concept and controversies
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This may be attributed to their roles in supporting mitochondrial function and reducing oxidative stress, which can contribute to fatigue