[header] How to make homemade master tonic [title] Buy garlic. [step] The different ingredients in the master tonic are important. The first ingredient that you need is garlic. 
Garlic has a number of components that have been shown to have anti-microbial and immune-boosting properties and is considered safe for adults and children in doses normally used in food. Garlic can also lower cholesterol and help control blood sugar.