Using micro-encapsulated delivery systems and slow-release acidic modifiers can improve pH regulation in feed applications to prevent the colonisation of undesirable micro-organisms along the gastrointestinal tract. Targeted delivery can be used with a single component or a blend of several minerals and other ingredients that have demonstrated therapeutic effects. Micro-encapsulation technology has even enhanced the bio-availability of green tea extract for use as an effective anti-microbial in broiler diets. While green tea extract may be more expensive, micro-encapsulation allows poultry farmers to use less to obtain the same efficacy.