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The active chemicals of commonly-used sunscreens end up in a wearer's blood.
The U.S. Food and Drug Administration, or FDA, reported recently
that the chemicals are present at much higher levels than current government health rules permit.
For this reason, the researchers call for more safety studies.
Sunscreens were first sold to prevent sunburn and did not have to meet many government regulations.
Now they are widely used to block radiation from the sun that can cause skin cancer,
the most common kind of cancer in the United States.
To test some of the effects of sunscreen, researchers worked with 23 volunteers.
They tested four forms of sunscreen by putting it on most of the volunteers' bodies four times a day over four days.
Then, they did blood tests over seven days to find the levels of certain chemicals absorbed into the volunteers' blood.
The study looked for the chemicals from sunscreen in plasma, the watery part of blood that contains blood cells.
常用防晒霜中的活性化学物质最终会进入使用者的血液。
美国食品药品监督管理局(简称FDA)近期发表的报告显示,
被吸收到人体血液中的防晒霜化学物质,远高于目前政府健康规定所容许的水平。
基于此,研究人员呼吁展开更多安全性研究。
防晒霜最初被用来避免被太阳晒伤,不必符合大多数政府规定。
而现在,防晒霜被广泛用于阻止可引发皮肤癌的太阳辐射,
皮肤癌是美国最常见的癌症种类。
在23名志愿者的协助下,研究人员对防晒霜的影响进行了测试。
研究人员测试了4款防晒霜,他们让志愿者连续4天每天涂抹4次防晒霜,而且要覆盖身体大部分皮肤。
随后,研究人员连续7天对志愿者进行血液测试,以确定志愿者血液中吸收的特定化学物质的含量。
研究测量了血浆中防晒霜化学物质的含量,血浆是血液的液体部分,含有血液细胞。
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