Much has been written about the physical and chemical characteristics of graphene and its potential health and safety risks. However, to date there has been a significant absence of repeatable experimental information on the potential health effects of graphene in humans based on inhalation.
A recent toxicology study might offer some answers. In particular, an inhalation toxicology study of graphene, titled “28-Day inhalation toxicity of graphene nanoplatelets in Sprague-Dawley rats” and published in the Nanotoxicology journal, was conducted using a nose-only inhalation system for 28 days (6 h/day and 5 days/week) with male Sprague-Dawley rats that were then allowed to recover for 1-, 28-, and 90-day post-exposure period. Animals were separated into 4 groups (control, low, moderate, and high) with 15 male rats (5 rats per time point) in each group.
The results show no distinct lung pathology was observed at the 1-, 28- and 90-day post-exposure and low toxicity.