Sunblock = Infertility

Teenagers follow role models. Most of their role models are from Cricket and Bollywood.

Like their role model, they too will prefer sunscreen.

Like many other modern habits, Indians are disrespecting natural sun exposure boon they have. They use sunscreen lotion! 😀

Some of them do it by mimicking their role models from Bollywood and Cricket, and some do it for fair skin obsession!

What they actually do is, they penetrate unwanted chemicals to the skin and hamper normal skin operations.

For Men, it is like, injecting female hormones as per this research. 🙂 Now you know why we have womanly men around. 🙂 And why infertility is increasing in urban youth.

Out of many possible reasons, one is sunscreen obsession!


Some Sunscreen Ingredients May Disrupt Sperm Cell Function

Many ultraviolet (UV)-filtering chemicals commonly used in sunscreens interfere with the function of human sperm cells, and some mimic the effect of the female hormone progesterone, a new study finds. Results of the Danish study will be presented Friday at the Endocrine Society’s 98th annual meeting in Boston.

“These results are of concern and might explain in part why unexplained infertility is so prevalent,” said the study’s senior investigator, Niels Skakkebaek, MD, DMSc, a professor at the University of Copenhagen and a researcher at the Copenhagen University Hospital, Rigshospitalet.

Although the purpose of the chemical UV filters is to reduce the amount of the sun’s UV rays getting through the skin by absorbing UV, some UV filters are rapidly absorbed through the skin, Skakkebaek said. UV filter chemicals reportedly have been found in human blood samples and in 95 percent of urine samples in the U.S., Denmark and other countries.

Skakkebaek and his colleagues tested 29 of the 31 UV filters allowed in sunscreens in the U.S. or the European Union (EU) on live, healthy human sperm cells, from fresh semen samples obtained from several healthy donors. The sperm cells underwent testing in a buffer solution that resembled the conditions in female fallopian tubes.

Specifically, the investigators evaluated calcium signaling, which is signaling inside the cell brought on by changes in the concentration of calcium ions. Movement of calcium ions within sperm cells, through calcium ion channels, plays a major role on sperm cell function, according to Skakkebaek. CatSper is a sperm-specific calcium ion channel that he said is essential for male fertility. This channel is the main sperm receptor for progesterone, a potent hormone attractant for human sperm cells. Binding of progesterone to CatSper causes a temporary influx, or surge, of calcium ions into the sperm cell, controlling several sperm functions necessary for fertilization.