Lactoferrin (LF) is a multifunctional protein found in milk and other secretions. Known for its remarkable ability to bind and transport iron, lactoferrin helps regulate iron absorption and has potent anti-inflammatory, antibacterial, and antiviral properties. Its role extends to enhancing the body's immune responses and playing a part in the regulation of cellular growth. Lactoferrin is valued not just for its iron binding capability but also for its contribution to the maintenance of immune health.

Immunoglobulin G (IgG) and Immunoglobulin A (IgA) are crucial antibodies in the body's immune response. They defend against infections by recognizing and neutralizing pathogens like bacteria and viruses. IgG is the most abundant type of antibody, circulating in the bloodstream and offering systemic protection. IgA is primarily found in mucosal areas such as the gut, respiratory tract, and saliva, playing a critical role in local immune defense.

Lactoperoxidase (LPO) functions as part of the body's first line of defense, particularly in oral and respiratory health. LPO combats microbial growth by catalyzing the oxidation of thiocyanate ions in the presence of hydrogen peroxide, producing potent antimicrobials. Its role in protecting mucous membranes from infection makes it a valuable ingredient in promoting overall health.

A uniquely formulated type of the flavonoid quercetin, known for its anti-inflammatory properties and relief of allergy symptoms. Quercetin levels in the blood tested 20 times higher in blood measurements when patients take Quercefit® vs standard quercetin at comparable 500 mg doses.