Lipsticks tested by a U.S. consumer rights group The Campaign for Safe Cosmetics found that more than half contained lead and some popular brands including Cover Girl, L’Oreal and Christian Dior had more lead than others, the group said on Thursday.

The Bodycote Testing Group in Santa Fe Spring, California, found that sixty-one percent of lipsticks had detectable lead levels of 0.03 to 0.65 parts per million (ppm).

The FDA has not set a limit for lead in lipstick.

“It’s critical that manufacturers reformulate their product,” said Stacy Malkan, a co-founder of the coalition. “It’s possible to make lipsticks without lead, and all companies should be doing that.”

“Lead builds up in the body over time and lead-containing lipstick applied several times a day, every day, can add up to significant exposure levels.”

“All the brands of the L’Oreal Group are in full compliance with FDA regulations” as well as safety requirements in international markets, L’Oreal USA said in a statement on Thursday.

P&G said in a statement that the quantity of lead a consumer might be exposed to from its lip product “is hundreds of times less than the amount that she would get from eating, breathing and drinking water.”

Lead can cause learning, language and behavioral problems such as reduced school performance and increased aggression. Pregnant women and young children are particularly vulnerable. The toxin has also been linked to infertility and miscarriage, it said.