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Home / Business / Sunscreen goes into the blood after only one day of use, the study says

Sunscreen goes into the blood after only one day of use, the study says



The study, published Monday in the medical journal JAMA, also found that the blood concentration of three of the ingredients continued to rise as daily use continued, and then remained in the body for at least 24 hours after the sunscreen use ended.

So should you stop using sunscreen? Certainly not, say experts.

"Studies need to be performed to evaluate this finding and determine if there are true medical implications for the absorption of certain ingredients," said Yale School of Medicine dermatologist Dr. David Leffell, a spokesman for the US Dermatology Academy. He added that in the meantime, people should "continue to be aggressive against sun protection."

"The sun is the real enemy here," said Scott Faber, senior vice president of government affairs at the Environmental Group, or EWG, a lawyer group publishing an annual sunscreen guide.

"It's not news that things you put on your skin are being absorbed into your body," Faber said. "This study is the FDA's way of showing sunscreen manufacturers, they must do the studies to see if chemical absorption poses health risks."

The Need to Protect

According to the Skin Cancer Foundation, more Americans are diagnosed with skin cancer each year than all other cancers combined. Around the world, melanoma is ranked as the 19th most common cancer in both men and women, says the World Cancer Research Fund.
  The myth of the sunscreen

In the United States, sunscreen was originally approved as an over-the-counter solution for sunburn. They came in two types: one using chemical combinations to filter the sun, the other using minerals to block the sun, such as titanium dioxide or zinc oxide, leaving the story white coating. Do not want to track a white hue, the popularity of the chemical sunscreen increased.

Due to the way they were used at that time, there was no particular concern about a potential health effect. But it was soon changed, and the FDA began asking the safety testing industry, said David Andrews, senior researcher at EWG.

"They were originally used in small quantities to avoid sunburn on vacation," Andrews said. "Now, they recommend that they be used every day and use them for large parts of your body. And the FDA started raising concerns."

A Small Study of Sunscreen Chemicals

The new FDA study recorded 24 rapid volunteers who were randomly assigned to a spray or sunscreen containing avobenzone, oxybenzene or octo-cryo as ingredients or a sun cream with cream containing the chemical ecamsule.

Volunteers were asked to put their assigned sunscreen at 75% of the body four times each day for four days. Thirty blood samples were taken from each volunteer over seven days.

Of the six who used ecamsule cream, five levels of the chemical in the blood were statistically significant at the end of day one. For the other three chemicals, especially oxybenzene, all volunteers showed significant levels after the first day.

"Reviewing the results tables of the study, one thing about oxybenzone stood out," said David Andrews, senior researcher at EWG. "Oxybenzone was absorbed into the body at about 50 to 100 times higher concentration than any of these three other chemicals they tested."

  Are sun-protecting dead coral reefs?
In 2008, the US Centers for Disease Control and Prevention analyzed urine samples collected by a government survey and found oxybenzene in 97% of the samples. Since then, studies have shown a potential relationship between oxybenzene and lower testosterone levels in juvenile boys, hormone changes in males and shorter pregnancies, and disturbed birth weight in babies, but researchers cautioned in predicting attachment.
Of all sunscreen ingredients, oxybenzone is known to be the most common cause of contact allergies; A 10-year study found 70% of the people a positive patch test when exposed.
A Swiss study found oxybenzene or one of four other sunscreen chemicals in 85% of breast milk samples, which sparked that newborns could potentially be exposed.
And Hawaii, the Pacific nation Palau and Key West recently banned sunscreen containing oxybenzone and octinoxate because they cause coral bleaching and are dangerous to marine ecosystems.
The European Union has mostly replaced oxybenzene in sunscreen products with newer, more protective substances that block several of the hazardous UV-B and UVA rays. But the newer products have not passed the safety tests needed for FDA approval. So oxybenzene remains in use; In fact, a 2018 report from the EWG estimated that it was in two-thirds of all chemically based sunscreens sold in the United States.

Protect yourself from the sun

In an editorial attached to the new study, former FDA chairman Dr. Robert Califf assured readers that just because the study found chemical levels "well above the FDA guidelines, these ingredients do not mean uncertain."

In a statement, the Personal Care Products Council, which is the National Trade Council for sunscreen, cosmetic and personal care products, agreed.

"The presence of plasma sunscreen after maximum use does not necessarily lead to safety problems," said Alex Kowcz, chief researcher of the Council.

"It is important for consumers to know that in the context of this study, sunscreen was used on 75% of the body four times a day for four days – which is twice as much as would be used in the scientific community considering real conditions. "Kowcz said. The Council was concerned, she said, that the FDA's study might confuse consumers and counteract the use of sunscreen.

The American dermatology academy recommends using at least one ounce of sunscreen for all exposed skin every 2 hours or after swimming, including "back, neck, face, ears, tops of feet and legs. If you have thin hair, you must also Use sunscreen for the scalp or wear a folded hat, to protect your lips, use a lip balm with an SPF of at least 15, says the academy, adding that since UV rays are always present, sunscreen should be applied to exposed skin itself In Cloudy Days and Winter.

Research Needed

Califf said the next step would be to properly design clinical trials of the industry to test safety and determine the optimal dose to prevent skin cancer while balancing risk and benefit. ] In addition, he said that an urgent question involves absorption in infants and children who have different body surface conditions to total size and whose skin can absorb substances by diff erensialhastigheter. "

Personal Care Products Council's statement said the industry has offered" state-of-the-art toxicological safety options as alternatives "to the FDA's test method." We look forward to our ongoing work with the FDA to ensure that consumers have access to products containing a wide variety of sunscreen active ingredients, "said Kowcz.

While science continues to answer sunscreen questions, Califf and other experts call the public to continue protecting the skin from the sun's dangerous rays.

The American dermatological The academy recommends choosing the two mineral sunscreens containing titanium dioxide and zinc oxide whenever possible as first choice, but sunscreen containing the 12 ingredients to be examined by the FDA is not considered uncertain by the agency and it has not suggested stopping its use now

There are ways to protect yourself and your family other than sunscreen, according to the academy. 10 am and 2 am when the sun is at its hottest and when your shade is shorter than you. Wear protective clothing, such as long-sleeved shirts and trousers, a wide-width hat and do not forget about the sunglasses.

"It seeks shade, uses clothes and when needed with sunscreen," said EWGs Andrews, "but does not use sunscreen to prolong the time in the sun."


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