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Yogurt is made by inoculating certain bacteria Streptococcus thermophilus andLactobacillus bulgaricus, into milk This is called - starter culture.

You can make it at home, if you place a tablesppon of yogurt in a glass of milk, the bacteria will reproduce and spread through the milk, and within 6 to 12 hours, transform the milk to yogurt. But yogurt cultures are "fussy" -- the milk must be boiled first in order to remove any competing bacteria and then cooled to a lukewarm temperature so that the yogurt bacteria won't be killed by high heat. You could also use sterile powdered milk, or a combination of the two (boiled and sterile).

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13y ago

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