A black caston oil may be the ultimate anti-aging treatment, according to a new study.

The study of more than 10,000 black castan oil users published in the American Journal of Dermatology found that those who use castor oils have a lower risk of acne, redness and other skin problems than those who don’t.

The research team also found that people who use the oil for more than a month have a significantly lower risk for dark circles, red spots and other visible signs of aging.

The study, led by researchers at the University of California, Los Angeles (UCLA), was funded by the National Institutes of Health.

The researchers tested the effectiveness of the oil in reducing the signs of dark circles and redness in a sample of 679 black castoreans who took part in the study.

They found that the oil had no detectable anti-ageing effects, but only when applied to the skin after five weeks of regular use.

The researchers tested different levels of the compound on the skin and found that after five days of daily use, there was no increase in the number of dark spots or redness.

“Our results show that regular use of castor ointments has no negative effects on the human skin,” the authors wrote.

“However, when applied during the early stages of aging, the use of these products can increase the risk of skin aging.”

In addition, those who regularly used the oil experienced a significantly reduced risk of wrinkles and red spots.

“There is no evidence to support the use in patients with acne,” the study authors concluded.

“These findings may have implications for use of other skin-care products, such as cosmetics and lotions.”

The researchers added that while castor extracts are relatively safe, they should not be used by people with preexisting skin problems, since the oil could increase their risk of infection.

“In the future, it may be helpful to further investigate the use and safety of castorean oil in patients who are at high risk of developing acne,” they wrote.

The authors of the study said they were encouraged by the results.

“This is the first report that has demonstrated that a topical castoreacol (sucrose) has no effect on the incidence of skin ageing and the risk for acne,” lead researcher Rana Kasturi, MD, told the BBC.

“It also seems to be a safe product, and it has a low cost, which is important for the aging population.”