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This is a conceptual argument rather than a measured one again, the human PK data do not exist but it illustrates why systemic delivery is not self-evidently advantageous for a cosmetic goal, and why the burden of proof sits squarely on anyone claiming injection is the better skin route
Nov-Dec 2009;137(11-12):594-600
Mild vomiting or gastrointestinal discomfort
Improves Skin Texture- Hyaluronic acid maintains optimal hydration levels and helps to improve skin texture
Tryps and trips: cell trafficking across the 100-year-old bloodbrain barrier
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