Various ingredients in many popular sunscreen can enter the bloodstream after just one day of use, according to a recent study published in the medical journal JAMA.

The study conducted by the Center for Drug Evaluation and Research examined 24 healthy volunteers who were randomly assigned to a spray or lotion sunscreen that contained avobenzone, oxybenzone or octocrylene or a cream sunscreen that contained the chemical ecamsule.

Volunteers applied their sunscreen to 75 percent of their bodies each day for four days.

By the end of the first day, five of the six participants who applied the ecamsule cream had levels of ecamsule in their blood that are considered significant.

Participants who applied the other sunscreen, especially those who used products that contained oxybenzone, also showed significant levels of the chemical in their bloodstreams by the end of the first day.

These findings are significant, as the chemical oxybenzone has been shown to be a common cause of contact allergies.

Oxybenzone is also being studied for its potential connection to other conditions, including lower testosterone levels in adolescent boys and shorter pregnancies and disrupted birth weights in babies.

However, scientists who responded to the study warned that it should not prevent people from applying sunscreen, as the Skin Cancer Foundation notes that more Americans are diagnosed with skin cancer each year than all other cancers combined.