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One subject experienced mild erythema on Days 2 and 3, which resolved by Day 4 without discontinuing the lotion

Please take it as advised by your provider

Being a natural component of skin, it's well-tolerated by all skin types, including those with sensitive skin, but can be particularly helpful to those suffering with hyperpigmentation and/or melasma due to its role in changing melanin production, says Dr Jack

These findings highlight an important metabolic trade-off, suggesting that excessive augmentation of cysteine or GSH pools may not always be beneficial and could limit the efficacy of antioxidant-based therapeutic strategies