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The Homocysteine Pathway Homocysteine is a naturally occurring amino acid produced during the metabolism of another amino acid called methionine

To soothe and strengthen the skin barrier, it includes Centella Asiatica leaf water (Cica), a star ingredient in Korean skincare known for its regenerative and anti-inflammatory properties

Higher concentration or prescription-grade products may need refrigeration

When evaluating peptides, consider the quality of evidence, personal health history, and your healthcare providers guidance

Hydration and barrier function in healthy skin.

This guide reflects the current landscape as of June 2026