Quercetin is a natural flavonoid found in small amounts across a wide variety of fruits and vegetables. Unformulated quercetin is poorly absorbed in the gut and metabolised quickly, meaning large amounts need to be taken on a frequent basis in the hopes of delivering any major benefit. Natroceutics Quercetin Bioactive utilizes Quercefitâ„¢, which is shown to enhance the bioactivity and efficacy of quercetin. Natroceutics Quercetin is researched in the fields of allergy, asthma and dermatology and is recommended for modulating histamine reactions in allergies as well as supporting inflammatory and immune response.