New Holland Brewing

New Holland Brewing makes some delicious beers. I'm a huge fan of their Dragon's Milk and Porter.

They do make some brews with lactose or flavoring. Any flavoring is on the label, so it's easy to identify.
They do make some sour beers in old french wine casks, so that can be an issue for those beers.
They do not make any experimental beers or use wine yeast. They used to make a beer with champagne yeast, but that's fine.
They do share their lab with smaller breweries, but nothing from the lab is shared with their production line.

In conclusion, their unflavored beers are acceptable by Star K standards.