Infertile through sun milk: chemicals in UV filters can damage sperm

Infertile through sun milk: chemicals in UV filters can damage sperm

New study: sun milk can affect sperm function
Danish researchers have found that chemicals in sun milk can interfere with male sperm function. The UV filters can be harmful even in small quantities. The scientists described the results as worrying.

UV filters in sun milk can disturb sperm
According to dermatologists, one should not save on sunscreen when applying sunscreen. This advice does not always seem appropriate for men. As researchers from the University of Copenhagen have found, UV filters contained in sun milk can disrupt the function of sperm even in low doses. In addition, some chemical UV filters have a similar effect to the female sex hormone progesterone. This hormone is used worldwide to prevent premature babies, but according to new studies has no significant benefit. According to the Danish scientists, their results are worrying. The experts are increasingly demanding chemical tests before products are approved.

Several approved sunscreens tested
Sun creams mostly contain chemical, sometimes mineral filter substances that absorb or reflect UV radiation and thus protect the skin. Often several filter substances are combined, in some sunscreens nanoparticles such as nano-titanium dioxide are now used. As can be seen from a communication published on the website of the "Endocrine Society", the researchers led by Niels Skakkebaek from the University of Copenhagen tested in their study how 29 of the 31 UV filters for human sperm permitted in Europe and the USA for sunscreens were tested worked. They found that 13 of them impaired sperm function by changing their ion balance.

Effect even with very low doses
According to the information, the chemical substances activated a channel in the cell membrane of the germ cells, which led to a strong, premature influx of calcium. Usually, this only takes place when the sperm has reached the egg cell. If this happens too early, the “boost” is missing later and fertilization cannot take place. According to Skakkebaek, this effect already occurred at very low doses. It is already known from previous studies that at least some of the chemical UV filters are absorbed by the skin and can subsequently be detected in both the blood and urine. In addition, older studies have shown that plasticizers can affect the genome. A study by a German-Danish research group showed that substances that are used in sun milk and toothpaste, among other things, can damage male sperm.

Researchers express their concern
As the scientists found in the current study, the impairing effect of nine of the 13 sperm disruptive UV filters is due to the fact that the chemicals act like the female sex hormone progesterone. According to the researchers, this speaks for the fact that these agents are endocrine disruptors - chemicals that have a hormone-like effect. The 13 objectionable UV filters include the chemical compounds octyl salicylate, avobenzone, octocrilene, octinoxate, oxybenzone (also known as benzophenone-3) and Padimat-O, which are used in common sun creams as well as in cosmetics and lipsticks with UV protection are included. "These results raise concerns and could partially explain why medically unexplainable infertility is so common," said Skakkebaek. "Our study suggests that the competent authorities should have the effects of UV filters on fertility examined better before approval." (Ad)

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