Carbon monoxide is injected into the interior of the meat product along with other materials to produce a desired carbon monoxide saturation level. The amount of carbon monoxide in the added fluid is controlled to produce a desired carbon monoxide saturation level distributed substantially evenly throughout the volume of the meat product. This desired saturation level may vary depending upon the nature of the meat product being treated, however, the saturation level will generally remain at less than 100% or complete saturation for most meat products. The liquid added to meat product may be added simultaneously with the carbon monoxide or may be added as a pre-treatment before application of carbon monoxide or as a post-treatment after the application of carbon monoxide.