1. Shoulders MD, Raines RT. Collagen Structure and Stability. Annu Rev Biochem [Internet]. 2010 Mar 29 [cited 2024 Jun 21]; 78: 929-958. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2846778/
2. Aguirre-Cruz G, León-López A, Cruz-Gómez V, Jiménez-Alvarado R, Aguirre-Álvarez G. Collagen Hydrolysates for Skin Protection: Oral Administration and Topical Formulation. Antioxidants [Internet]. 2020 Feb 22 [cited 2024 Jun 21]; 9(2): 181. Available from: https://www.mdpi.com/2076-3921/9/2/181
3. Pu SY et al. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients [Internet]. 2023 Apr 26 [cited 2024 Jun 21]; 15(9): 2080. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10180699/
4. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6505
5. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6522
6. Versus Arthritis. What is collagen? [Internet]. Versus Arthritis [cited 2024 Jun 21]. Available from: https://versusarthritis.org/about-arthritis/complementary-and-alternative-treatments/types-of-complementary-treatments/collagen/
7. Santana JCC et al. Valorization of Chicken Feet By-Product of the Poultry Industry: High Qualities of Gelatin and Biofilm from Extraction of Collagen. Polymers (Basel) [Internet]. 2020 Mar 2 [cited 2024 Jun 21]; 12(3): 529. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7182801/
8. US Department of Agriculture (USDA). Eggs [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/748967/nutrients
9. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6510
10. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6502
11. NHS. Vitamin C [Internet]. NHS [reviewed 2020 Aug 3; cited 2024 Jun 21]. Available from: https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-c/
12. US Department of Agriculture (USDA). Strawberries, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/1102710/nutrients
13. US Department of Agriculture (USDA). Orange, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/2344665/nutrients
14. US Department of Agriculture (USDA). Lemon, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/2344662/nutrients
15. US Department of Agriculture (USDA). Blackberries, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/173946/nutrients
16. US Department of Agriculture (USDA). Raspberries, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/167755/nutrients
17. US Department of Agriculture (USDA). Blueberries, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/171711/nutrients
18. Versus Arthritis. MSM: What is it? [Internet]. Versus Arthritis [cited 2024 Jun 21]. Available from: https://versusarthritis.org/about-arthritis/complementary-and-alternative-treatments/types-of-complementary-treatments/msm/
19. Cho S et al. Drink Containing Chlorophyll Extracts Improves Signs of Photoaging and Increases Type 1 Procollagen in Human Skin in Vivo. 2006 Apr 13 [cited 2024 Jun 21]. Available from: https://oldkmbase.medric.or.kr/KMID/0604220060130040111
20. Solway J, McBride M, Haq F, Abdul W, Miller R. Diet and Dermatology: The Role of a Whole-Food, Plant-Based Diet in Preventing and Reversing Skin Aging – A Review. J Clin Aesthet Dermatol [Internet]. 2020 May 1 [cited 2024 Jun 21]; 13(5): 38-43. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7380694/
21. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6357
22. US Department of Agriculture (USDA). Nuts, hazelnuts or filberts, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/2515375/nutrients
23. NHS. Others – Vitamins and Minerals [Internet]. NHS [reviewed 2020 Aug 3; cited 2024 Jun 21]. Available from: https://www.nhs.uk/conditions/vitamins-and-minerals/others/
24. NHS. Vitamin E [Internet]. NHS [reviewed 2020 Aug 3; cited 2024 Jun 21]. Available from: https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-e/
25. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6522
26. Rinnerthaler M, Bischof J, Streubel MK, Trost A, Richter K. Oxidative Stress in Aging Human Skin. Biomolecules [Internet]. 2015 Jun [cited 2024 Jun 21]; 5(2): 545-589. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4496685/
27. US Department of Agriculture (USDA). Broccoli, raw [Internet]. USDA [cited 2024 Jun 21]. Available from: https://fdc.nal.usda.gov/fdc-app.html#/food-details/1103170/nutrients
28. NHS Inform. Vitamins and minerals [Internet]. NHS Inform [reviewed 2020 Apr 30; cited 2024 Jun 21]. Available from: https://www.nhsinform.scot/healthy-living/food-and-nutrition/eating-well/vitamins-and-minerals/#vitamins
29. European Commission. Characteristics [Internet]. European Commission [cited 2024 Jun 21]. Available from: https://ec.europa.eu/food/food-feed-portal/screen/health-claims/eu-register/details/POL-HC-6346