In recent years, it has been shown that humates added to the feed of poultry promote growth. However, supplementation has a feed additive in pig diets has not been well reported. Therefore, this research was carried out to determine the effect of Humic substances (HS) on growth performance, blood characteristics and meat quality in finishing pigs. This study did find that dietary supplementation with humic substances can improve growth performance, lymphocyte concentration and meat quality in finishing pigs.