• Hyaluronic Acid, A Key Molecule in Skin Aging – Eleni Papakonstantinou – Department of Pharmacology; School of medicine; Aristotele University of Thessaloniki; Greece – Pulmonary Cell Research-Pneumology; University Hospital Basel; Switzerland - 2012.
• Cosmeceuticals – Peter Elsner; Howard I. Maibach – Friedrich Schiller University, Jena, Germany – University of California, San Francisco, USA. Pág. 319, 320, 322 a 326, 328, 334, 335, 340, 341, 343, 344.
• Coenzyme Q10 enhances dermal elastin expression, inhibits IL-1α production and melanin synthesis in vitro - M.Zhang – The Space Biology Research Technology Center. Beijing, China – 2012.
• Discovering the link between nutrition and skin aging – Silke K. Schagen – Departments of Demartology, Venerology, Allergology and Immunology, Dessau Medical Center, Germany – 2012.
• The Healing Power of Vitamins, Minerals and Herbs – Pág. 372, 373, 382, 383 - Wayne Kalyn – 2000.
• Ingestion of BioCell Collagen®, a novel hydrolyzed chicken external cartilage extract; enhanced blood microcirculation and reduced facial aging signs – Stephen R. Schwartz – International Research Services Inc., Port Chester, New York, USA – 2012