It's nearly impossible to find bacon that's free of all forms of nitrates. According to a 2013 article on NerdFitness.com, turkey bacon packages labeled as having "no added nitrates" still contain the naturally occurring nitrates found in celery, which is frequently used instead of sodium nitrite in the curing process.
The natural nitrates found in celery juice or powder create a similar flavor to bacon while having less potentially harmful effects than those associated with sodium nitrates, as stated by Fox News Magazine. Applegate makes a natural turkey bacon without any added nitrates, according to the company's website. The ingredients include turkey, water, sea salt and celery powder. The turkey bacon also contains maple sugar, onion powder and spices such as cayenne pepper.