A study analyzed 96 used personal care and topical OTC drug items from U.S. consumers for microbial contamination.
Over 55% of eye and face products with global preservatives had high levels of microorganisms, while 79% of mascara products showed similar issues.
The research found that products with global preservatives struggled to maintain adequate preservation compared to those with non-global preservatives, with common contaminants including various bacteria and yeast.