Celery and celery juice can’t contain any nitrates that are activated or harmful unless the celery has oxidized or been dehydrated. The naturally occurring nitrates in celery don’t exist when the celery or fresh celery juice hasn’t yet oxidized. When fresh celery juice or celery does oxidize, just like when any herb, vegetable or fruit oxidizes, then a naturally occurring nitrate can develop. But this naturally occurring nitrate is also never harmful in any way, shape or form. Celery juice powder and celery powder have oxidized so they can contain naturally occurring nitrates because that developed through the oxidation process.
These nitrates are not the same variety of nitrates which are considered to be irritating to some people. It’s important to know that not all nitrates are the same, just like all people are not the same, all water is not the same, all sugar is not the same, and all protein is not the same. For example, gluten is an entirely different protein than the protein inside meat or the protein inside nuts. Also, the naturally occurring nitrates that can develop in an oxidized form of celery such as celery powder and celery juice powder are not the same as the harmful nitrates that are added to meat and all kinds of other products.
Also, nitrates are different to nitrites; they’re not the same thing. Even celery powder, which does contain naturally occurring nitrates, can’t be relied upon as a method for curing foods such as pickles or meat because it still doesn't contain nitrites. Fresh celery juice also doesn’t contain nitrites. Anything naturally occurring in celery and celery juice is not harmful. This is the same for pure celery powder and pure celery juice powder. However, harmful nitrates can be added to celery powder or celery juice powder by the company that makes it or uses it in another product. Your fresh celery juice can not have harmful nitrates in it unless you were to add them in yourself.
If you don’t drink fresh celery juice because you believe it contains harmful nitrates, then you are unfortunately going to lose the unique healing opportunity fresh celery juice, which does not contain nitrates, can provide.