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That's where it earns its place on our list

Dermatologic diseases Pemphigus Severe erythema multiforme (Stevens-Johnson Syndrome) Exfoliative dermatitis Bullous dermatitis herpetiformis Severe seborrheic dermatitis Severe psoriasis Mycosis fungoides 5

Co-enzyme B12 also interacts with the enzyme methionine synthase (5-methyltetrahydrofolate-homocysteine methyltransferase), required for the conversion of homocysteine to methionine, which is essential for folic acid metabolism and the formation of thymine, which is a component of DNA

For melasma, that means laser treatments and natural skincare routine, and good sun protection (which can be a mineral sunscreen or even UPF clothing)