I put it in the kettle for the last 15 minutes of the boil.

For the home-brew use add 1/2 tsp. per 5 gallons. The nutrient should be added during the last ten minuets of the boil.

I add yeast nutrient about 15 minutes before the end of boil.

It should be added at 10-15 minutes left in boiling.

10 minutes left of boil

10 minutes left in the boil follow the instructions and add your nutrients. I add about a teaspoon to an10 gallon batch.

I add the appropriate measured amount right at the end of the boil. This ensures that the yeast nutrient is sterilized without boiling it off or having it interact with the wort during the boil. I add yeast nutrient in all grain batches and also when I'm just using DME to make my yeast starters. This will help your pitched yeast thrive and give tasty well attenuated beers. CHEERS

I know some people actually add it after fermentation has started but I always add it with 10 minutes left in the boil for sanitation reasons.

15 min before flameout.

Last 15 minutes of the boil

Last 10 min of boil

Don't see why it wouldn't. I would put a little in with the yeast starter.

Yes. It's very good for giving yeast all the things they need to make a good clean fermentation.

Although cider is not my main fermentation I would think a yeast nutrient is especially necessary for cider. Beer wort has more nutrients of its own but fruit juice is almost solely sugar by comparison. I use a half tsp per 5 gallons beer I might double that for cider.