oral glutathione efficacy skin lightening randomized controlled trial Systemic as a Skin-Whitening Agent in Adult Intravenous glutathione for skin lightening:
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doi: 10.2174/1389557043403305

Users in a moderate deficit (300-500 calories/day) consistently report better outcomes than those eating at maintenance

Biomed Pharmacother 2021;140:111778.ArticlePubMed 58
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Furthermore, tamoxifen treatment also demonstrated some clinical activity in patients with metastatic melanomas 31 and glioblastomas 32

Factors like dosing, duration, health history, and overall goals matter
