(CNN) — A voluntary recall has been issued for more than 40 over-the-counter drugs for children, including Tylenol and Motrin, because they don’t meet quality standards.

“This recall is not being undertaken on the basis of adverse medical events,” McNeil Consumer Healthcare said in a statement Friday. “However, as a precautionary measure, parents and caregivers should not administer these products to their children.”

Swimming in a chlorinated pool may boost the odds that a child susceptible to asthma and allergies will develop these problems, a study indicates.

“These new data clearly show that by irritating the airways of swimmers chlorination products in water and air of swimming pools exert a strong additive effect on the development of asthma and respiratory allergies such as hay fever and allergic rhinitis,” Dr. Alfred Bernard, a toxicologist at the Catholic University of Louvain in Brussels, Belgium, noted in an email to Reuters Health.

Medical researchers at a Cambridge University hospital took four kids who were highly allergic to peanuts — eating the smallest amount would send them into possibly-deadly anaphylactic shock — and started giving them tiny doses of peanut flour ever day. Now, they can eat peanuts.

The small-scale study at Cambridge’s Addenbrooke’s Hospital successfully “desensitized” these kids to peanuts, by slowly feeding them larger and larger doses of their own personal kryptonite.