What is the best natural antimicrobial?

The best natural antimicrobial is often considered to be Manuka honey from New Zealand, because it has strong broad-spectrum activity against bacteria, including antibiotic-resistant strains like MRSA, and is actually FDA approved for medical wound dressings. Manuka honey contains high levels of methylglyoxal and produces hydrogen peroxide, which damages bacterial cell walls, prevents biofilm formation, and promotes wound healing without harming human tissue at appropriate concentrations. Other top natural antimicrobials include garlic, which contains allicin that kills bacteria, fungi, and some viruses, oregano oil rich in carvacrol and thymol that is potent against bacteria and fungi, tea tree oil effective for skin infections like acne and athlete's foot, and propolis from bees. However, best depends on use case, for wound care Manuka honey is best studied, for food preservation oregano oil is strong, for oral health tea tree and clove oil have activity. It is important to understand that even the best natural antimicrobials are much weaker than prescription antibiotics for serious internal infections, work slowly, require high concentrations that may irritate skin or lungs if inhaled, and do not replace antibiotics for bacterial pneumonia, urinary tract infections, or sepsis. Natural antimicrobials are best used as supportive measures for minor skin issues or food preservation, with proper dilution, and with good hygiene and HEPA air filtration to reduce airborne microbes.