Probiotics are living microorganisms that have beneficial effects on people's health. They are mostly species of bacteria that are either found in the human gastrointestinal tract or are similar to those that are found there. Probiotics change the environment in the human gastrointestinal system around them in ways that make it difficult for harmful bacteria to survive. One of the most common forms of probiotic preparations, and one that is relatively easy to make at home, is yogurt.
Things You'll Need
- 4 mason jars, 1-quart, with lids
- Large pot
- 1 gallon milk
- 2-cup measuring cup
- Cooler large enough to accommodate jars
Put the jars and lids into the large pot. Cover them with water. Bring them to a boil and allow them to boil for 10 minutes. This will sterilize them, giving the yogurt probiotics that you incubate in them a chance to grow without competition.
Empty the pot and add 1 gallon of milk to it. Heat it over a medium setting on the stove. Check the milk regularly with the thermometer. When it is between 180 and 195 degrees Fahrenheit, remove it from the heat. Do not let it get hotter than this. Wait for the yogurt to cool to between 115 and 120 F.
Pour 1 cup warm milk into the measuring cup. Add enough of the yogurt that is being used as starter to the measuring cup to bring the level up to 2 cups. The yogurt used as starter contains live cultures, and should have no sweeteners, preservative, gelatin or fillers. Stir the mixture with the spoon until the ingredients are blended.
Add the starter and milk mixture to the pot of warm milk, stirring as you pour. Pour the inoculated milk into the jars. Seal the lids in place.
Warm up a gallon of water to 130 degrees Fahrenheit. Pour it into your cooler. Set the jars of milk into the cooler and close the lid. Allow the yogurt to ferment for a minimum of three hours. This is the minimum time needed to grow enough probiotics to gel the milk. Some makers will ferment it up to 24 hours, to more fully develop the product.
Tips & Warnings
- If you cannot find four 1-quart mason jars then use eight 1-pint jars instead.
- Try using an electric yogurt maker to regulate the temperature instead of the cooler and warm water.
- U. C. Clermont College; Yogurt Making Illustrated; David B. Fankhauser, Ph.D.
- "The New York Times": They Do the Work, You Reap the Yogurt; Harold McGee; April 14, 2009
- "Mother Earth News"; How to Make Yogurt at Home; V.B. Ramig; March/April 1980
- National Institute of Health: An Introduction to Probiotics
- Foods With Highest Probiotics Content
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