{"title":"Topical L-ascorbic acid: percutaneous absorption studies","entity_type":"Source","slug":"pinnell-2001-topical-l-ascorbic-acid-absorption","canonical_url":"https://skinknowledgebase.com/sources/pinnell-2001-topical-l-ascorbic-acid-absorption","dates":{"date_modified":"2026-05-14","date_reviewed":"2026-05-14"},"mcp_eligible":true,"evidence_sources":[],"product_fact_sources":[],"related_entities":[{"title":"Is a vitamin C serum actually worth it?","url":"https://skinknowledgebase.com/questions/is-vitamin-c-serum-worth-it"},{"title":"What causes dull skin and how do I get a glow?","url":"https://skinknowledgebase.com/questions/what-causes-dull-skin-and-how-do-i-get-a-glow"}],"body_sections":[{"heading":"Quick Summary","paragraphs":["Pinnell 2001 supports formula-quality context for topical L-ascorbic acid, including concentration, pH, and absorption considerations."]},{"heading":"What Studied","paragraphs":["Peer-reviewed percutaneous absorption study focused on topical L-ascorbic acid and formula conditions."]},{"heading":"Main Findings","paragraphs":["The source supports the idea that L-ascorbic acid behavior depends on concentration and acidic formula conditions, including the pH 3.5 context used in many vitamin C serum discussions."]},{"heading":"Why It Matters","paragraphs":["It helps explain why vitamin C serum value depends on formula design rather than the ingredient name alone."]}],"source_type":"peer_reviewed","original_source_url":"https://pubmed.ncbi.nlm.nih.gov/11207686/"}