Be careful, unless your yogurt states that it is made from WHOLE MILK only (raw is best) you aren’t getting that much from it.
Since the consumer demands tapioca not yogurt consistency they added milk powder solids into their mix. When the bacteria digests the lactose it reaches a ceiling PH and then dies off. With real milk it runs out of lactose before it hits the PH ceiling and is therefore ready to be re-activated once more food and warmth are present. However since the addition of milk solids the PH is reached before the lactose is gone this makes the yogurt thicker and sweeter but also kills most of the active bugs…