fortify
v//ˈfɔɹtəˌfaɪ//befästa, berika, spetsa
To increase the defences of (an army, soldiers, etc.), or put (it or them) in a defensive position.
To increase the nutritional value of (food) by adding ingredients, especially minerals or vitamins. [from mid 20th c.]
(winemaking) To add spirits to (wine) to increase the alcohol content. [from late 19th c.]