Green Seal, a non-profit authority on safer and more sustainable cleaning and facility care products, is now certifying alcohol-based hand sanitizers that meet the highest standard for health and safety in the marketplace amid growing consumer concern about toxic products.    With the COVID-19 pandemic spurring many first-time producers to enter the market, the FDA has warned consumers to avoid more than 200 hand sanitizer products because of incorrect formulations and high levels of hazardous i...