Is there a risk of applying sunscreen? Research says chemical sunscreen ingredients go into the bloodstream
May 09, 2019 Source: Sina Technology
Window._bd_share_config={ "common":{ "bdSnsKey":{ },"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":" 0","bdSize":"16"},"share":{ }};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')) .src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];Sina Technology News Beijing time on May 9th news, according to foreign media reports, a recent US government research report said that when people apply sunscreen on the skin, the chemicals in these sunscreen products will be absorbed into the blood And their impact on human health is still unknown.
The study, conducted by researchers at the US Food and Drug Administration (FDA), found that sunscreen chemicals penetrate the body's blood fairly quickly and can reach alarming levels, with enough necessary for these substances. The security is further tested.
The study was small and had only 24 participants. However, this is the first time researchers have accurately measured the amount of sunscreen chemicals in human blood and the time these chemicals stay in the blood. It is unclear whether these chemicals will cause the level of harm seen in the study of health.
Researchers say the significance of the study is that the discovery of chemicals in the blood does not mean that people should stop using sunscreen, especially considering that sunburn can also pose a well-known serious risk. The results of the study were published in the May 6 issue of the Journal of the American Medical Association (JAMA).
Dr. Kanade Shinkai, a dermatologist at the University of California, San Francisco, is one of the authors of a review article on the study in the same issue. She said that people should continue to use sunscreen and follow sunscreen recommendations. She said: "We are very sure that the sun may cause skin cancer and melanoma."
However, the results of this study suggest that it is necessary to further study the potential health effects of these chemicals after entering the bloodstream. We don't know what the data of the circulatory system (blood) absorbs sunscreen chemicals means, which is very worrying.
It’s not just the skin that is affected
Sunscreens have been widely used in recent decades, but surprisingly, little research has been done on the safety and efficacy of many of the common chemicals in these products. In this new study, 24 healthy adult volunteers were asked to apply sunscreen on their skin four times a day for four days. These participants were divided into four groups, each receiving a different sunscreen formula (one lotion, one lotion and two sunscreen sprays).
The researchers used the recommended amount of sunscreen. Specifically, 2 mg of sunscreen is applied per square centimeter of skin, and the total area applied is 75% of the body of each participant. Participants stayed in the lab for 7 days and were not actually exposed to the sun. During the study, the researchers collected 30 blood samples from each participant.
The researchers examined the blood levels of four common sunscreen ingredients: avobenzone, oxybenzone, octocrylene, and ecamsule. They want to know if the blood levels of these chemicals exceed 0.5 ng per ml, which is the threshold set by the FDA in 2016. The FDA believes that if any drug absorbed by the blood exceeds this threshold, an additional safety study should be performed.
The test results showed that the four chemical substances in the participants' blood levels exceeded the threshold within a short day of applying sunscreen. Moreover, when sunscreen is reapplied, the amount of these chemicals in the blood will gradually increase over the next few days, indicating that sunscreen chemicals may accumulate in the blood over time.
Safety study
These findings from the new study do not mean that chemical sunscreen products are unsafe, but do show that sunscreen ingredients need to pass the same safety tests as other "systemic" drugs (drugs that enter the bloodstream). Further research will focus on whether exposure to these chemicals in the blood is related to potential cancer risks or effects on the reproductive system.
The researchers also pointed out that their research was conducted indoors without exposure to sunlight or heat radiation, and these factors may affect the extent to which sunscreen chemicals are absorbed into the bloodstream. In addition, more research is needed to determine if blood absorption levels will change due to factors such as skin type, age, and how much sunscreen is applied. In February of this year, the FDA introduced new regulations aimed at improving the safety of sunscreens and asked the sunscreen industry to provide more evidence on the safety of 12 common sunscreen ingredients. Dr. Kanade Shinkai pointed out that in theory, if the manufacturer could not submit the data before November, all sunscreens containing these 12 chemicals could be removed. However, Dr. Kanade Shinkai expects manufacturers to postpone this deadline, and if there is evidence that these companies are working on safety research, they may be allowed to postpone.
Although some people worry that the chemical composition of sunscreen will affect health, some sunscreen ingredients do not penetrate into the blood and are generally considered safe, including zinc oxide and titanium dioxide, both of which are so-called mineral sunscreens. ingredient. This type of product works by covering the skin and reflecting light, rather than absorbing light like a chemical sunscreen.
It is worth mentioning that the use of sunscreen is just one of the recommended ways to protect yourself from sunburn. Other methods suggested by the US Centers for Disease Control and Prevention include finding shelters, wearing protective clothing, hats, and sunglasses. (任天)
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