On most lists of products containing estrogen, animal products like milk and beef are at the very bottom. Milk, for example, is said to provide 1.2 micrograms of estrogen per 100 grams.
Depends on where you go to get your fix. Starbucks Cold Brew (in stores nationwide since May 2015) and Dunkin' Donuts Cold Brew (in stores nationwide since August 2016) retail for different prices. Cost: Roughly $0.20 per ounce. $3.25 for a grande (16 fluid ounces) according to Starbucks.
For the sake of comparison, a 12 oz. Pike Place contains 260mg of caffeine, and a 12 oz. Starbucks Doubleshot On Ice has 150mg of caffeine. So basically, the Nitro Cold Brew isn't quite as strong as hot coffee, but it's still one of the more caffeinated iced beverages on Starbucks' menu.