Many people suffer from allergies triggered by indoor and outdoor substances. These allergens include, but are not limited to, pollen, dust, mold, pet dander, certain foods, certain medicines or vaccines, personal care products, and environmental pollutants. An allergic person will react to these substances with one or more of the following symptoms: increased mucous production causing upper respiratory congestion, inflammation, rash, itching, or hives. This formula provides relief to allergy sufferers and may benefit asthma patients. It can be used for colds, flu, runny nose, and conditions of excessive phlegm. Histablock also controls the immune system’s inflammatory response, with its blend of stinging nettle, quercetin, bitter orange peel and bromelain.