Quote:
Originally Posted by Marnica 
if you can use yogurt itself as a starter culture....why would anyone use the actual cultures...they seem pricey? Is there a benefit to using these vs using yougurt itself??
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There's three ways to make yogurt:
1. Use yogurt from the store. This method works fine but you have to keep buying some yogurt to work as a starter. Some people have luck freezing the yogurt so they can just pull a little out when needed. Ultimately though, you just have to buy some yogurt to use as a starter but at least not all the yogurt you are eating.
2. Get a yogurt starter from the health food or grocery store (e.g. Yogourmet brand, etc.). There's no significant benefit of using this method over buying yogurt at the store except maybe that since they are packets of dried culture, you could stock up. They are one time use though.
3. Get a natural self-perpetuating yogurt starter. The natural starters are meant to be serial-cultured, that is a small amount from each batch is used to inoculate the next batch of yogurt. So it works like the yogurt form the store but with care should last indefinitely. They tend to be more costly on the front end but since they last a long time, they do save money in the long run. The other benefit is that they are natural cultures--passed down through the generations--not manufactured in a laboratory.
For what it's worth, there are also natural cultures that work at room temperature (70-78 degrees) called mesophilic cultures (aka counter-top yogurt starters). They aren't quite as thick as the heated cultures but they also don't require any sort of heating appliance.