1) https://www.cancer.org/cancer/cancer-causes/radiation-exposure/uv-radiation
2) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406
3) https://thrivecausemetics.com/blogs/blog/what-is-astaxanthin-and-why-is-it-better-than-vitamin-c-for-your-skin
4) https://www.cancer.org/cancer/cancer-causes/radiation-exposure/uv-radiation
5) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3709783/
6) https://allgoodproducts.com/what-is-oxybenzone/
7) https://www.news-medical.net/health/What-is-Melanin.aspx
8) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2671032/
9) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5514578/
10) https://www.nobelprize.org/prizes/chemistry/1938/ceremony-speech/
11) https://link.springer.com/article/10.1007/s10811-019-01904-8
12) https://www.webmd.com/vitamins/ai/ingredientmono-1063/astaxanthin
13) https://www.fda.gov/news-events/fda-voices/shedding-more-light-sunscreen-absorption
14) https://uk-air.defra.gov.uk/research/ozone-uv/moreinfo?view=increase-uv-radiation#:~:text=The%20depletion%20of%20the%20ozone,%2C%20ultraviolet%20(UV)%20radiation.
15) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5946307/
16) https://www.healthline.com/health/depression/benefits-sunlight#benefits
17) https://pubmed.ncbi.nlm.nih.gov/18803658/
18) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5269753/
19) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5295690/
20) https://www.ncbi.nlm.nih.gov/books/NBK247164/figure/skincancer.f3/