To protect us from the sun, these days we use creams, lotions and sprays with ultraviolet radiation (UV) filters installed. Organic ("chemical") and mineral ("physical") UV filters are used.
Mineral filters, which consist of zinc oxide or titanium dioxide, have the disadvantage that the skin is whitish when applied – unless you've squashed zinc oxide and titanium dioxide. The resulting nanoparticles are so tiny that they suspect they enter the body over the skin. However, skin penetration has never been scientifically proven.
Much less obvious are organic ("chemical") filters. Some of them showed effects on the balance of hormones in laboratory and animal experiments. How important it is to people is not familiar with the Federal Public Health Office (FOPH). However, because the doses used in the laboratory are significantly higher than the estimated intake, FOPH believes that health risk "from today's perspective is unlikely."
However, organic sunscreen reserves are currently receiving new foods, and a study published in the American Medical Journal "JAMA" in May shows that organic filters can soon be detected in human blood after being applied to the skin.
The first day's limit was reached
The study was conducted by the US Food and Drug Administration (FDA). Twenty-four healthy adults in the laboratory carried conventional creams, lotions or sprays four times a day four times a day at the recommended level (2 mg / cm2) to 75 percent of the body surface. The products contained four broadest sun protection agents (avobenzone, oxybenzone, octocrylate and ecamsul).
The study showed that all four sun protection factors in the blood were detected above the threshold (0.5 nanograms per deciliter). The limit was usually reached after one day and continued to grow the next few days.
What effect it is currently affecting our health. In a study comment, dermatologist Canada Shinkai of the University of California, San Francisco, writes that "detecting sun protection factors can not be considered harmful." Further tests are urgently needed before any concerns can be completely eliminated.
Earlier studies with the sunblock factor by oxybenzone showed that it can be detected in blood, urine, mother's milk and amniotic fluid. So for Canada Shinaki clearly: "Definitely there is a reason for concern about who purchases drugs and can expect to be tested for safety." But sunscreen has never been proven. These medications can not be denied, but those who want to play safe should use better mineral filters.
This opinion is shared by Christian Surber, a research associate and visiting professor at the Basel and Zurich Dermatological University Clinics. Surber advises conscious use and targeted use of sunscreens. "If you use funds according to the recommended guidelines, you are in green." In pregnant women, children and toddlers, but sunscreen with organic filters are generally avoided.